{@code Class} has no public constructor. Instead a {@code Class} * object is constructed automatically by the Java Virtual Machine * when a class loader invokes one of the * {@link ClassLoader#defineClass(String,byte[], int,int) defineClass} methods * and passes the bytes of a {@code class} file. * *
The methods of class {@code Class} expose many characteristics of a * class or interface. Most characteristics are derived from the {@code class} * file that the class loader passed to the Java Virtual Machine. A few * characteristics are determined by the class loading environment at run time, * such as the module returned by {@link #getModule() getModule()}. * *
Some methods of class {@code Class} expose whether the declaration of * a class or interface in Java source code was enclosed within * another declaration. Other methods describe how a class or interface * is situated in a nest. A nest is a set of * classes and interfaces, in the same run-time package, that * allow mutual access to their {@code private} members. * The classes and interfaces are known as nestmates. * One nestmate acts as the * nest host, and enumerates the other nestmates which * belong to the nest; each of them in turn records it as the nest host. * The classes and interfaces which belong to a nest, including its host, are * determined when * {@code class} files are generated, for example, a Java compiler * will typically record a top-level class as the host of a nest where the * other members are the classes and interfaces whose declarations are * enclosed within the top-level class declaration. * *
The following example uses a {@code Class} object to print the * class name of an object: * *
* void printClassName(Object obj) {
* System.out.println("The class of " + obj +
* " is " + obj.getClass().getName());
* }
* It is also possible to get the {@code Class} object for a named * type (or for void) using a class literal. See Section 15.8.2 of * The Java™ Language Specification. * For example: * *
* {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} ** * @param
@{@code interface}, as appropriate), followed
* by the type's name, followed by an angle-bracketed
* comma-separated list of the type's type parameters, if any,
* including informative bounds on the type parameters, if any.
*
* A space is used to separate modifiers from one another and to
* separate any modifiers from the kind of type. The modifiers
* occur in canonical order. If there are no type parameters, the
* type parameter list is elided.
*
* For an array type, the string starts with the type name,
* followed by an angle-bracketed comma-separated list of the
* type's type parameters, if any, followed by a sequence of
* {@code []} characters, one set of brackets per dimension of
* the array.
*
* Note that since information about the runtime representation * of a type is being generated, modifiers not present on the * originating source code or illegal on the originating source * code may be present. * * @return a string describing this {@code Class}, including * information about modifiers and type parameters * * @since 1.8 */ public String toGenericString() { if (isPrimitive()) { return toString(); } else { StringBuilder sb = new StringBuilder(); Class component = this; int arrayDepth = 0; if (isArray()) { do { arrayDepth++; component = component.getComponentType(); } while (component.isArray()); sb.append(component.getName()); } else { // Class modifiers are a superset of interface modifiers int modifiers = getModifiers() & Modifier.classModifiers(); if (modifiers != 0) { sb.append(Modifier.toString(modifiers)); sb.append(' '); } if (isAnnotation()) { sb.append('@'); } if (isValue()) { sb.append("value"); sb.append(' '); } if (isInterface()) { // Note: all annotation types are interfaces sb.append("interface"); } else { if (isEnum()) sb.append("enum"); else sb.append("class"); } sb.append(' '); sb.append(getName()); } TypeVariable[] typeparms = component.getTypeParameters(); if (typeparms.length > 0) { sb.append(Arrays.stream(typeparms) .map(Class::typeVarBounds) .collect(Collectors.joining(",", "<", ">"))); } for (int i = 0; i < arrayDepth; i++) sb.append("[]"); return sb.toString(); } } static String typeVarBounds(TypeVariable typeVar) { Type[] bounds = typeVar.getBounds(); if (bounds.length == 1 && bounds[0].equals(Object.class)) { return typeVar.getName(); } else { return typeVar.getName() + " extends " + Arrays.stream(bounds) .map(Type::getTypeName) .collect(Collectors.joining(" & ")); } } /** * Returns the {@code Class} object associated with the class or * interface with the given string name. Invoking this method is * equivalent to: * *
* {@code Class.forName(className, true, currentLoader)} ** * where {@code currentLoader} denotes the defining class loader of * the current class. * *
For example, the following code fragment returns the * runtime {@code Class} descriptor for the class named * {@code java.lang.Thread}: * *
* {@code Class t = Class.forName("java.lang.Thread")} **
* A call to {@code forName("X")} causes the class named * {@code X} to be initialized. * * @param className the fully qualified name of the desired class. * @return the {@code Class} object for the class with the * specified name. * @exception LinkageError if the linkage fails * @exception ExceptionInInitializerError if the initialization provoked * by this method fails * @exception ClassNotFoundException if the class cannot be located */ @CallerSensitive public static Class forName(String className) throws ClassNotFoundException { Class caller = Reflection.getCallerClass(); return forName0(className, true, ClassLoader.getClassLoader(caller), caller); } /** * Returns the {@code Class} object associated with the class or * interface with the given string name, using the given class loader. * Given the fully qualified name for a class or interface (in the same * format returned by {@code getName}) this method attempts to * locate, load, and link the class or interface. The specified class * loader is used to load the class or interface. If the parameter * {@code loader} is null, the class is loaded through the bootstrap * class loader. The class is initialized only if the * {@code initialize} parameter is {@code true} and if it has * not been initialized earlier. * *
If {@code name} denotes a primitive type or void, an attempt * will be made to locate a user-defined class in the unnamed package whose * name is {@code name}. Therefore, this method cannot be used to * obtain any of the {@code Class} objects representing primitive * types or void. * *
If {@code name} denotes an array class, the component type of * the array class is loaded but not initialized. * *
If {@code name} denotes a value class, this method returns * the {@code Class} object representing the * {@linkplain #asBoxType() box value type}. * *
For example, in an instance method the expression: * *
* {@code Class.forName("Foo")} ** * is equivalent to: * *
* {@code Class.forName("Foo", true, this.getClass().getClassLoader())} ** * Note that this method throws errors related to loading, linking or * initializing as specified in Sections 12.2, 12.3 and 12.4 of The * Java Language Specification. * Note that this method does not check whether the requested class * is accessible to its caller. * * @param name fully qualified name of the desired class * @param initialize if {@code true} the class will be initialized. * See Section 12.4 of The Java Language Specification. * @param loader class loader from which the class must be loaded * @return class object representing the desired class * * @exception LinkageError if the linkage fails * @exception ExceptionInInitializerError if the initialization provoked * by this method fails * @exception ClassNotFoundException if the class cannot be located by * the specified class loader * @exception SecurityException * if a security manager is present, and the {@code loader} is * {@code null}, and the caller's class loader is not * {@code null}, and the caller does not have the * {@link RuntimePermission}{@code ("getClassLoader")} * * @see java.lang.Class#forName(String) * @see java.lang.ClassLoader * @since 1.2 */ @CallerSensitive public static Class forName(String name, boolean initialize, ClassLoader loader) throws ClassNotFoundException { Class caller = null; SecurityManager sm = System.getSecurityManager(); if (sm != null) { // Reflective call to get caller class is only needed if a security manager // is present. Avoid the overhead of making this call otherwise. caller = Reflection.getCallerClass(); if (loader == null) { ClassLoader ccl = ClassLoader.getClassLoader(caller); if (ccl != null) { sm.checkPermission( SecurityConstants.GET_CLASSLOADER_PERMISSION); } } } return forName0(name, initialize, loader, caller); } /** Called after security check for system loader access checks have been made. */ private static native Class forName0(String name, boolean initialize, ClassLoader loader, Class caller) throws ClassNotFoundException; /** * Returns the {@code Class} with the given * binary name in the given module. * *
This method attempts to locate, load, and link the class or interface. * It does not run the class initializer. If the class is not found, this * method returns {@code null}.
* *If the class loader of the given module defines other modules and * the given name is a class defined in a different module, this method * returns {@code null} after the class is loaded.
* *If {@code name} denotes a value class, this method returns * the {@code Class} object representing the * {@linkplain #asBoxType() box value type}.
* *This method does not check whether the requested class is * accessible to its caller.
* * @apiNote * This method returns {@code null} on failure rather than * throwing a {@link ClassNotFoundException}, as is done by * the {@link #forName(String, boolean, ClassLoader)} method. * The security check is a stack-based permission check if the caller * loads a class in another module. * * @param module A module * @param name The binary name * of the class * @return {@code Class} object of the given name defined in the given module; * {@code null} if not found. * * @throws NullPointerException if the given module or name is {@code null} * * @throws LinkageError if the linkage fails * * @throws SecurityException * A value class has two {@code Class} representations,
* a null-free type or a nullable box type, that can be obtained
* by calling {@link #asValueType()} or {@link #asBoxType()} method
* for conversion.
*
* @return the box type of this class if this class is a value class;
* otherwise, this class.
*/
@HotSpotIntrinsicCandidate
public Class A value class has two {@code Class} representations,
* a null-free type or a nullable box type, that can be obtained
* by calling {@link #asValueType()} or {@link #asBoxType()} method
* for conversion.
*
* @return the unbox value type of this class if this class is a value class;
* otherwise, {@code null}.
*/
@HotSpotIntrinsicCandidate
public Class The call
*
* Specifically, if this {@code Class} object represents a
* declared class, this method returns {@code true} if the specified
* {@code Object} argument is an instance of the represented class (or
* of any of its subclasses); it returns {@code false} otherwise. If
* this {@code Class} object represents an array class, this method
* returns {@code true} if the specified {@code Object} argument
* can be converted to an object of the array class by an identity
* conversion or by a widening reference conversion; it returns
* {@code false} otherwise. If this {@code Class} object
* represents an interface, this method returns {@code true} if the
* class or any superclass of the specified {@code Object} argument
* implements this interface; it returns {@code false} otherwise. If
* this {@code Class} object represents a primitive type, this method
* returns {@code false}.
*
* @param obj the object to check
* @return true if {@code obj} is an instance of this class
*
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public native boolean isInstance(Object obj);
/**
* Determines if the class or interface represented by this
* {@code Class} object is either the same as, or is a superclass or
* superinterface of, the class or interface represented by the specified
* {@code Class} parameter. It returns {@code true} if so;
* otherwise it returns {@code false}. If this {@code Class}
* object represents a primitive type, this method returns
* {@code true} if the specified {@code Class} parameter is
* exactly this {@code Class} object; otherwise it returns
* {@code false}.
*
* Specifically, this method tests whether the type represented by the
* specified {@code Class} parameter can be converted to the type
* represented by this {@code Class} object via an identity conversion
* or via a widening reference conversion. See The Java Language
* Specification, sections 5.1.1 and 5.1.4 , for details.
*
* @param cls the {@code Class} object to be checked
* @return the {@code boolean} value indicating whether objects of the
* type {@code cls} can be assigned to objects of this class
* @exception NullPointerException if the specified Class parameter is
* null.
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public native boolean isAssignableFrom(Class cls);
/**
* Determines if the specified {@code Class} object represents an
* interface type.
*
* @return {@code true} if this object represents an interface;
* {@code false} otherwise.
*/
@HotSpotIntrinsicCandidate
public native boolean isInterface();
/**
* Determines if this {@code Class} object represents an array class.
*
* @return {@code true} if this object represents an array class;
* {@code false} otherwise.
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public native boolean isArray();
/**
* Determines if the specified {@code Class} object represents a
* primitive type.
*
* There are nine predefined {@code Class} objects to represent
* the eight primitive types and void. These are created by the Java
* Virtual Machine, and have the same names as the primitive types that
* they represent, namely {@code boolean}, {@code byte},
* {@code char}, {@code short}, {@code int},
* {@code long}, {@code float}, and {@code double}.
*
* These objects may only be accessed via the following public static
* final variables, and are the only {@code Class} objects for which
* this method returns {@code true}.
*
* @return true if and only if this class represents a primitive type
*
* @see java.lang.Boolean#TYPE
* @see java.lang.Character#TYPE
* @see java.lang.Byte#TYPE
* @see java.lang.Short#TYPE
* @see java.lang.Integer#TYPE
* @see java.lang.Long#TYPE
* @see java.lang.Float#TYPE
* @see java.lang.Double#TYPE
* @see java.lang.Void#TYPE
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public native boolean isPrimitive();
/**
* Returns true if this {@code Class} object represents an annotation
* type. Note that if this method returns true, {@link #isInterface()}
* would also return true, as all annotation types are also interfaces.
*
* @return {@code true} if this class object represents an annotation
* type; {@code false} otherwise
* @since 1.5
*/
public boolean isAnnotation() {
return (getModifiers() & ANNOTATION) != 0;
}
/**
* Returns {@code true} if this class is a synthetic class;
* returns {@code false} otherwise.
* @return {@code true} if and only if this class is a synthetic class as
* defined by the Java Language Specification.
* @jls 13.1 The Form of a Binary
* @since 1.5
*/
public boolean isSynthetic() {
return (getModifiers() & SYNTHETIC) != 0;
}
/**
* Returns the name of the entity (class, interface, array class,
* primitive type, or void) represented by this {@code Class} object,
* as a {@code String}.
*
* If this class object represents a reference type that is not an
* array type then the binary name of the class is returned, as specified
* by
* The Java™ Language Specification.
*
* If this class object represents a primitive type or void, then the
* name returned is a {@code String} equal to the Java language
* keyword corresponding to the primitive type or void.
*
* If this class object represents a class of arrays, then the internal
* form of the name consists of the name of the element type preceded by
* one or more '{@code [}' characters representing the depth of the array
* nesting. The encoding of element type names is as follows:
*
* The class or interface name classname is the binary name of
* the class specified above.
*
* Examples:
* If this object
* represents a primitive type or void, null is returned.
*
* @return the class loader that loaded the class or interface
* represented by this object.
* @throws SecurityException
* if a security manager is present, and the caller's class loader
* is not {@code null} and is not the same as or an ancestor of the
* class loader for the class whose class loader is requested,
* and the caller does not have the
* {@link RuntimePermission}{@code ("getClassLoader")}
* @see java.lang.ClassLoader
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public ClassLoader getClassLoader() {
ClassLoader cl = getClassLoader0();
if (cl == null)
return null;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
}
return cl;
}
// Package-private to allow ClassLoader access
ClassLoader getClassLoader0() { return classLoader; }
/**
* Returns the module that this class or interface is a member of.
*
* If this class represents an array type then this method returns the
* {@code Module} for the element type. If this class represents a
* primitive type or void, then the {@code Module} object for the
* {@code java.base} module is returned.
*
* If this class is in an unnamed module then the {@linkplain
* ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
* loader for this class is returned.
*
* @return the module that this class or interface is a member of
*
* @since 9
* @spec JPMS
*/
public Module getModule() {
return module;
}
// set by VM
private transient Module module;
// Initialized in JVM not by private constructor
// This field is filtered from reflection access, i.e. getDeclaredField
// will throw NoSuchFieldException
private final ClassLoader classLoader;
/**
* Returns an array of {@code TypeVariable} objects that represent the
* type variables declared by the generic declaration represented by this
* {@code GenericDeclaration} object, in declaration order. Returns an
* array of length 0 if the underlying generic declaration declares no type
* variables.
*
* @return an array of {@code TypeVariable} objects that represent
* the type variables declared by this generic declaration
* @throws java.lang.reflect.GenericSignatureFormatError if the generic
* signature of this generic declaration does not conform to
* the format specified in
* The Java™ Virtual Machine Specification
* @since 1.5
*/
@SuppressWarnings("unchecked")
public TypeVariable If the superclass is a parameterized type, the {@code Type}
* object returned must accurately reflect the actual type
* parameters used in the source code. The parameterized type
* representing the superclass is created if it had not been
* created before. See the declaration of {@link
* java.lang.reflect.ParameterizedType ParameterizedType} for the
* semantics of the creation process for parameterized types. If
* this {@code Class} represents either the {@code Object}
* class, an interface, a primitive type, or void, then null is
* returned. If this object represents an array class then the
* {@code Class} object representing the {@code Object} class is
* returned.
*
* @throws java.lang.reflect.GenericSignatureFormatError if the generic
* class signature does not conform to the format specified in
* The Java™ Virtual Machine Specification
* @throws TypeNotPresentException if the generic superclass
* refers to a non-existent type declaration
* @throws java.lang.reflect.MalformedParameterizedTypeException if the
* generic superclass refers to a parameterized type that cannot be
* instantiated for any reason
* @return the direct superclass of the class represented by this object
* @since 1.5
*/
public Type getGenericSuperclass() {
ClassRepository info = getGenericInfo();
if (info == null) {
return getSuperclass();
}
// Historical irregularity:
// Generic signature marks interfaces with superclass = Object
// but this API returns null for interfaces
if (isInterface()) {
return null;
}
return info.getSuperclass();
}
/**
* Gets the package of this class.
*
* If this class represents an array type, a primitive type or void,
* this method returns {@code null}.
*
* @return the package of this class.
* @revised 9
* @spec JPMS
*/
public Package getPackage() {
if (isPrimitive() || isArray()) {
return null;
}
ClassLoader cl = getClassLoader0();
return cl != null ? cl.definePackage(this)
: BootLoader.definePackage(this);
}
/**
* Returns the fully qualified package name.
*
* If this class is a top level class, then this method returns the fully
* qualified name of the package that the class is a member of, or the
* empty string if the class is in an unnamed package.
*
* If this class is a member class, then this method is equivalent to
* invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
* enclosing class}.
*
* If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
* #isAnonymousClass() anonymous class}, then this method is equivalent to
* invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
* declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
* {@linkplain #getEnclosingConstructor enclosing constructor}.
*
* If this class represents an array type then this method returns the
* package name of the element type. If this class represents a primitive
* type or void then the package name "{@code java.lang}" is returned.
*
* @return the fully qualified package name
*
* @since 9
* @spec JPMS
* @jls 6.7 Fully Qualified Names
*/
public String getPackageName() {
String pn = this.packageName;
if (pn == null) {
Class c = this;
while (c.isArray()) {
c = c.getComponentType();
}
if (c.isPrimitive()) {
pn = "java.lang";
} else {
String cn = c.getName();
int dot = cn.lastIndexOf('.');
pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
}
this.packageName = pn;
}
return pn;
}
// cached package name
private transient String packageName;
/**
* Returns the interfaces directly implemented by the class or interface
* represented by this object.
*
* If this object represents a class, the return value is an array
* containing objects representing all interfaces directly implemented by
* the class. The order of the interface objects in the array corresponds
* to the order of the interface names in the {@code implements} clause of
* the declaration of the class represented by this object. For example,
* given the declaration:
* If this object represents an interface, the array contains objects
* representing all interfaces directly extended by the interface. The
* order of the interface objects in the array corresponds to the order of
* the interface names in the {@code extends} clause of the declaration of
* the interface represented by this object.
*
* If this object represents a class or interface that implements no
* interfaces, the method returns an array of length 0.
*
* If this object represents a primitive type or void, the method
* returns an array of length 0.
*
* If this {@code Class} object represents an array type, the
* interfaces {@code Cloneable} and {@code java.io.Serializable} are
* returned in that order.
*
* @return an array of interfaces directly implemented by this class
*/
public Class[] getInterfaces() {
// defensively copy before handing over to user code
return getInterfaces(true);
}
private Class[] getInterfaces(boolean cloneArray) {
ReflectionData If a superinterface is a parameterized type, the
* {@code Type} object returned for it must accurately reflect
* the actual type parameters used in the source code. The
* parameterized type representing each superinterface is created
* if it had not been created before. See the declaration of
* {@link java.lang.reflect.ParameterizedType ParameterizedType}
* for the semantics of the creation process for parameterized
* types.
*
* If this object represents a class, the return value is an array
* containing objects representing all interfaces directly implemented by
* the class. The order of the interface objects in the array corresponds
* to the order of the interface names in the {@code implements} clause of
* the declaration of the class represented by this object.
*
* If this object represents an interface, the array contains objects
* representing all interfaces directly extended by the interface. The
* order of the interface objects in the array corresponds to the order of
* the interface names in the {@code extends} clause of the declaration of
* the interface represented by this object.
*
* If this object represents a class or interface that implements no
* interfaces, the method returns an array of length 0.
*
* If this object represents a primitive type or void, the method
* returns an array of length 0.
*
* If this {@code Class} object represents an array type, the
* interfaces {@code Cloneable} and {@code java.io.Serializable} are
* returned in that order.
*
* @throws java.lang.reflect.GenericSignatureFormatError
* if the generic class signature does not conform to the format
* specified in
* The Java™ Virtual Machine Specification
* @throws TypeNotPresentException if any of the generic
* superinterfaces refers to a non-existent type declaration
* @throws java.lang.reflect.MalformedParameterizedTypeException
* if any of the generic superinterfaces refer to a parameterized
* type that cannot be instantiated for any reason
* @return an array of interfaces directly implemented by this class
* @since 1.5
*/
public Type[] getGenericInterfaces() {
ClassRepository info = getGenericInfo();
return (info == null) ? getInterfaces() : info.getSuperInterfaces();
}
/**
* Returns the {@code Class} representing the component type of an
* array. If this class does not represent an array class this method
* returns null.
*
* @return the {@code Class} representing the component type of this
* class if this class is an array
* @see java.lang.reflect.Array
* @since 1.1
*/
public Class getComponentType() {
// Only return for array types. Storage may be reused for Class for instance types.
if (isArray()) {
return componentType;
} else {
return null;
}
}
private final Class componentType;
/**
* Returns the Java language modifiers for this class or interface, encoded
* in an integer. The modifiers consist of the Java Virtual Machine's
* constants for {@code public}, {@code protected},
* {@code private}, {@code final}, {@code static},
* {@code abstract} and {@code interface}; they should be decoded
* using the methods of class {@code Modifier}.
*
* If the underlying class is an array class, then its
* {@code public}, {@code private} and {@code protected}
* modifiers are the same as those of its component type. If this
* {@code Class} represents a primitive type or void, its
* {@code public} modifier is always {@code true}, and its
* {@code protected} and {@code private} modifiers are always
* {@code false}. If this object represents an array class, a
* primitive type or void, then its {@code final} modifier is always
* {@code true} and its interface modifier is always
* {@code false}. The values of its other modifiers are not determined
* by this specification.
*
* The modifier encodings are defined in The Java Virtual Machine
* Specification, table 4.1.
*
* @return the {@code int} representing the modifiers for this class
* @see java.lang.reflect.Modifier
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public native int getModifiers();
/**
* Gets the signers of this class.
*
* @return the signers of this class, or null if there are no signers. In
* particular, this method returns null if this object represents
* a primitive type or void.
* @since 1.1
*/
public Object[] getSigners() {
Class c = (isValue() && !isBoxType()) ? asBoxType() : this;
return c.getSigners0();
}
private native Object[] getSigners0();
/**
* Set the signers of this class.
*/
void setSigners(Object[] signers) {
Class c = (isValue() && !isBoxType()) ? asBoxType() : this;
c.setSigners0(signers);
}
native void setSigners0(Object[] signers);
/**
* If this {@code Class} object represents a local or anonymous
* class within a method, returns a {@link
* java.lang.reflect.Method Method} object representing the
* immediately enclosing method of the underlying class. Returns
* {@code null} otherwise.
*
* In particular, this method returns {@code null} if the underlying
* class is a local or anonymous class immediately enclosed by a type
* declaration, instance initializer or static initializer.
*
* @return the immediately enclosing method of the underlying class, if
* that class is a local or anonymous class; otherwise {@code null}.
*
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* The simple name of an array is the simple name of the
* component type with "[]" appended. In particular the simple
* name of an array whose component type is anonymous is "[]".
*
* The simple name of a value type is the simple name of
* this class with {@code ".box"} appended.
*
* @return the simple name of the underlying class
* @since 1.5
*/
public String getSimpleName() {
ReflectionData If this {@code Class} object represents a class or interface with
* no accessible public fields, then this method returns an array of length
* 0.
*
* If this {@code Class} object represents a class, then this method
* returns the public fields of the class and of all its superclasses and
* superinterfaces.
*
* If this {@code Class} object represents an interface, then this
* method returns the fields of the interface and of all its
* superinterfaces.
*
* If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
* The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Field} objects representing the
* public fields
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*
* @since 1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@CallerSensitive
public Field[] getFields() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
}
return copyFields(privateGetPublicFields());
}
/**
* Returns an array containing {@code Method} objects reflecting all the
* public methods of the class or interface represented by this {@code
* Class} object, including those declared by the class or interface and
* those inherited from superclasses and superinterfaces.
*
* If this {@code Class} object represents an array type, then the
* returned array has a {@code Method} object for each of the public
* methods inherited by the array type from {@code Object}. It does not
* contain a {@code Method} object for {@code clone()}.
*
* If this {@code Class} object represents an interface then the
* returned array does not contain any implicitly declared methods from
* {@code Object}. Therefore, if no methods are explicitly declared in
* this interface or any of its superinterfaces then the returned array
* has length 0. (Note that a {@code Class} object which represents a class
* always has public methods, inherited from {@code Object}.)
*
* The returned array never contains methods with names "{@code The elements in the returned array are not sorted and are not in any
* particular order.
*
* Generally, the result is computed as with the following 4 step algorithm.
* Let C be the class or interface represented by this {@code Class} object:
* The field to be reflected is determined by the algorithm that
* follows. Let C be the class or interface represented by this object:
*
* If this {@code Class} object represents an array type, then this
* method does not find the {@code length} field of the array type.
*
* @param name the field name
* @return the {@code Field} object of this class specified by
* {@code name}
* @throws NoSuchFieldException if a field with the specified name is
* not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*
* @since 1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@CallerSensitive
public Field getField(String name)
throws NoSuchFieldException, SecurityException {
Objects.requireNonNull(name);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
}
Field field = getField0(name);
if (field == null) {
throw new NoSuchFieldException(name);
}
return getReflectionFactory().copyField(field);
}
/**
* Returns a {@code Method} object that reflects the specified public
* member method of the class or interface represented by this
* {@code Class} object. The {@code name} parameter is a
* {@code String} specifying the simple name of the desired method. The
* {@code parameterTypes} parameter is an array of {@code Class}
* objects that identify the method's formal parameter types, in declared
* order. If {@code parameterTypes} is {@code null}, it is
* treated as if it were an empty array.
*
* If this {@code Class} object represents an array type, then this
* method finds any public method inherited by the array type from
* {@code Object} except method {@code clone()}.
*
* If this {@code Class} object represents an interface then this
* method does not find any implicitly declared method from
* {@code Object}. Therefore, if no methods are explicitly declared in
* this interface or any of its superinterfaces, then this method does not
* find any method.
*
* This method does not find any method with name "{@code Generally, the method to be reflected is determined by the 4 step
* algorithm that follows.
* Let C be the class or interface represented by this {@code Class} object:
* The constructor to reflect is the public constructor of the class
* represented by this {@code Class} object whose formal parameter
* types match those specified by {@code parameterTypes}.
*
* @param parameterTypes the parameter array
* @return the {@code Constructor} object of the public constructor that
* matches the specified {@code parameterTypes}
* @throws NoSuchMethodException if a matching method is not found.
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*
* @since 1.1
*/
@CallerSensitive
public Constructor If this {@code Class} object represents a class or interface with no
* declared fields, then this method returns an array of length 0.
*
* If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
* The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Field} objects representing all the
* declared fields of this class
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* If this {@code Class} object represents a type that has multiple
* declared methods with the same name and parameter types, but different
* return types, then the returned array has a {@code Method} object for
* each such method.
*
* If this {@code Class} object represents a type that has a class
* initialization method {@code If this {@code Class} object represents a class or interface with no
* declared methods, then the returned array has length 0.
*
* If this {@code Class} object represents an array type, a primitive
* type, or void, then the returned array has length 0.
*
* The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Method} objects representing all the
* declared methods of this class
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* See The Java Language Specification, section 8.2.
*
* @return the array of {@code Constructor} objects representing all the
* declared constructors of this class
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* If this {@code Class} object represents an array type, then this
* method does not find the {@code length} field of the array type.
*
* @param name the name of the field
* @return the {@code Field} object for the specified field in this
* class
* @throws NoSuchFieldException if a field with the specified name is
* not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* If this {@code Class} object represents an array type, then this
* method does not find the {@code clone()} method.
*
* @param name the name of the method
* @param parameterTypes the parameter array
* @return the {@code Method} object for the method of this class
* matching the specified name and parameters
* @throws NoSuchMethodException if a matching method is not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
* If this class is in a named {@link Module Module} then this method
* will attempt to find the resource in the module. This is done by
* delegating to the module's class loader {@link
* ClassLoader#findResource(String,String) findResource(String,String)}
* method, invoking it with the module name and the absolute name of the
* resource. Resources in named modules are subject to the rules for
* encapsulation specified in the {@code Module} {@link
* Module#getResourceAsStream getResourceAsStream} method and so this
* method returns {@code null} when the resource is a
* non-"{@code .class}" resource in a package that is not open to the
* caller's module.
*
* Otherwise, if this class is not in a named module then the rules for
* searching resources associated with a given class are implemented by the
* defining {@linkplain ClassLoader class loader} of the class. This method
* delegates to this object's class loader. If this object was loaded by
* the bootstrap class loader, the method delegates to {@link
* ClassLoader#getSystemResourceAsStream}.
*
* Before delegation, an absolute resource name is constructed from the
* given resource name using this algorithm:
*
* Where the {@code modified_package_name} is the package name of this
* object with {@code '/'} substituted for {@code '.'}
* ( If this class is in a named {@link Module Module} then this method
* will attempt to find the resource in the module. This is done by
* delegating to the module's class loader {@link
* ClassLoader#findResource(String,String) findResource(String,String)}
* method, invoking it with the module name and the absolute name of the
* resource. Resources in named modules are subject to the rules for
* encapsulation specified in the {@code Module} {@link
* Module#getResourceAsStream getResourceAsStream} method and so this
* method returns {@code null} when the resource is a
* non-"{@code .class}" resource in a package that is not open to the
* caller's module.
*
* Otherwise, if this class is not in a named module then the rules for
* searching resources associated with a given class are implemented by the
* defining {@linkplain ClassLoader class loader} of the class. This method
* delegates to this object's class loader. If this object was loaded by
* the bootstrap class loader, the method delegates to {@link
* ClassLoader#getSystemResource}.
*
* Before delegation, an absolute resource name is constructed from the
* given resource name using this algorithm:
*
* Where the {@code modified_package_name} is the package name of this
* object with {@code '/'} substituted for {@code '.'}
* ( Default policy: allow all clients access with normal Java access
* control.
*
* NOTE: should only be called if a SecurityManager is installed
*/
private void checkMemberAccess(SecurityManager sm, int which,
Class caller, boolean checkProxyInterfaces) {
/* Default policy allows access to all {@link Member#PUBLIC} members,
* as well as access to classes that have the same class loader as the caller.
* In all other cases, it requires RuntimePermission("accessDeclaredMembers")
* permission.
*/
final ClassLoader ccl = ClassLoader.getClassLoader(caller);
if (which != Member.PUBLIC) {
final ClassLoader cl = getClassLoader0();
if (ccl != cl) {
sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
}
}
this.checkPackageAccess(sm, ccl, checkProxyInterfaces);
}
/*
* Checks if a client loaded in ClassLoader ccl is allowed to access this
* class under the current package access policy. If access is denied,
* throw a SecurityException.
*
* NOTE: this method should only be called if a SecurityManager is active
*/
private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl,
boolean checkProxyInterfaces) {
final ClassLoader cl = getClassLoader0();
if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
String pkg = this.getPackageName();
if (pkg != null && !pkg.isEmpty()) {
// skip the package access check on a proxy class in default proxy package
if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
sm.checkPackageAccess(pkg);
}
}
}
// check package access on the proxy interfaces
if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
}
}
/**
* Add a package name prefix if the name is not absolute Remove leading "/"
* if name is absolute
*/
private String resolveName(String name) {
if (!name.startsWith("/")) {
Class c = this;
while (c.isArray()) {
c = c.getComponentType();
}
String baseName = c.getPackageName();
if (baseName != null && !baseName.isEmpty()) {
name = baseName.replace('.', '/') + "/" + name;
}
} else {
name = name.substring(1);
}
return name;
}
/**
* Atomic operations support.
*/
private static class Atomic {
// initialize Unsafe machinery here, since we need to call Class.class instance method
// and have to avoid calling it in the static initializer of the Class class...
private static final Unsafe unsafe = Unsafe.getUnsafe();
// offset of Class.reflectionData instance field
private static final long reflectionDataOffset
= unsafe.objectFieldOffset(Class.class, "reflectionData");
// offset of Class.annotationType instance field
private static final long annotationTypeOffset
= unsafe.objectFieldOffset(Class.class, "annotationType");
// offset of Class.annotationData instance field
private static final long annotationDataOffset
= unsafe.objectFieldOffset(Class.class, "annotationData");
static
* Few programmers will have any need for this method; it is provided
* for the benefit of the JRE itself. (It allows a class to determine at
* the time that it is initialized whether assertions should be enabled.)
* Note that this method is not guaranteed to return the actual
* assertion status that was (or will be) associated with the specified
* class when it was (or will be) initialized.
*
* @return the desired assertion status of the specified class.
* @see java.lang.ClassLoader#setClassAssertionStatus
* @see java.lang.ClassLoader#setPackageAssertionStatus
* @see java.lang.ClassLoader#setDefaultAssertionStatus
* @since 1.4
*/
public boolean desiredAssertionStatus() {
ClassLoader loader = getClassLoader0();
// If the loader is null this is a system class, so ask the VM
if (loader == null)
return desiredAssertionStatus0(this);
// If the classloader has been initialized with the assertion
// directives, ask it. Otherwise, ask the VM.
synchronized(loader.assertionLock) {
if (loader.classAssertionStatus != null) {
return loader.desiredAssertionStatus(getName());
}
}
return desiredAssertionStatus0(this);
}
// Retrieves the desired assertion status of this class from the VM
private static native boolean desiredAssertionStatus0(Class clazz);
/**
* Returns true if and only if this class was declared as an enum in the
* source code.
*
* @return true if and only if this class was declared as an enum in the
* source code
* @since 1.5
*/
public boolean isEnum() {
// An enum must both directly extend java.lang.Enum and have
// the ENUM bit set; classes for specialized enum constants
// don't do the former.
return (this.getModifiers() & ENUM) != 0 &&
this.getSuperclass() == java.lang.Enum.class;
}
// Fetches the factory for reflective objects
private static ReflectionFactory getReflectionFactory() {
if (reflectionFactory == null) {
reflectionFactory =
java.security.AccessController.doPrivileged
(new ReflectionFactory.GetReflectionFactoryAction());
}
return reflectionFactory;
}
private static ReflectionFactory reflectionFactory;
/**
* Returns the elements of this enum class or null if this
* Class object does not represent an enum type.
*
* @return an array containing the values comprising the enum class
* represented by this Class object in the order they're
* declared, or null if this Class object does not
* represent an enum type
* @since 1.5
*/
public T[] getEnumConstants() {
T[] values = getEnumConstantsShared();
return (values != null) ? values.clone() : null;
}
/**
* Returns the elements of this enum class or null if this
* Class object does not represent an enum type;
* identical to getEnumConstants except that the result is
* uncloned, cached, and shared by all callers.
*/
T[] getEnumConstantsShared() {
T[] constants = enumConstants;
if (constants == null) {
if (!isEnum()) return null;
try {
final Method values = getMethod("values");
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<>() {
public Void run() {
values.setAccessible(true);
return null;
}
});
@SuppressWarnings("unchecked")
T[] temporaryConstants = (T[])values.invoke(null);
enumConstants = constants = temporaryConstants;
}
// These can happen when users concoct enum-like classes
// that don't comply with the enum spec.
catch (InvocationTargetException | NoSuchMethodException |
IllegalAccessException ex) { return null; }
}
return constants;
}
private transient volatile T[] enumConstants;
/**
* Returns a map from simple name to enum constant. This package-private
* method is used internally by Enum to implement
* {@code public static This method is useful when a client needs to "narrow" the type of
* a {@code Class} object to pass it to an API that restricts the
* {@code Class} objects that it is willing to accept. A cast would
* generate a compile-time warning, as the correctness of the cast
* could not be checked at runtime (because generic types are implemented
* by erasure).
*
* @param the type to cast this class object to
* @param clazz the class of the type to cast this class object to
* @return this {@code Class} object, cast to represent a subclass of
* the specified class object.
* @throws ClassCastException if this {@code Class} object does not
* represent a subclass of the specified class (here "subclass" includes
* the class itself).
* @since 1.5
*/
@SuppressWarnings("unchecked")
public Class asSubclass(Class clazz) {
if (clazz.isAssignableFrom(this))
return (Class) this;
else
throw new ClassCastException(this.toString());
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@SuppressWarnings("unchecked")
public A getAnnotation(Class annotationClass) {
Objects.requireNonNull(annotationClass);
return (A) annotationData().annotations.get(annotationClass);
}
/**
* {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@Override
public boolean isAnnotationPresent(Class annotationClass) {
return GenericDeclaration.super.isAnnotationPresent(annotationClass);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
public A[] getAnnotationsByType(Class annotationClass) {
Objects.requireNonNull(annotationClass);
AnnotationData annotationData = annotationData();
return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
this,
annotationClass);
}
/**
* @since 1.5
*/
public Annotation[] getAnnotations() {
return AnnotationParser.toArray(annotationData().annotations);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
@SuppressWarnings("unchecked")
public A getDeclaredAnnotation(Class annotationClass) {
Objects.requireNonNull(annotationClass);
return (A) annotationData().declaredAnnotations.get(annotationClass);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
public A[] getDeclaredAnnotationsByType(Class annotationClass) {
Objects.requireNonNull(annotationClass);
return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
annotationClass);
}
/**
* @since 1.5
*/
public Annotation[] getDeclaredAnnotations() {
return AnnotationParser.toArray(annotationData().declaredAnnotations);
}
// annotation data that might get invalidated when JVM TI RedefineClasses() is called
private static class AnnotationData {
final Map If this {@code Class} object represents a type whose declaration
* does not explicitly indicate an annotated superclass, then the return
* value is an {@code AnnotatedType} object representing an element with no
* annotations.
*
* If this {@code Class} represents either the {@code Object} class, an
* interface type, an array type, a primitive type, or void, the return
* value is {@code null}.
*
* @return an object representing the superclass
* @since 1.8
*/
public AnnotatedType getAnnotatedSuperclass() {
if (this == Object.class ||
isInterface() ||
isArray() ||
isPrimitive() ||
this == Void.TYPE) {
return null;
}
return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
}
/**
* Returns an array of {@code AnnotatedType} objects that represent the use
* of types to specify superinterfaces of the entity represented by this
* {@code Class} object. (The use of type Foo to specify a
* superinterface in '... implements Foo' is distinct from the
* declaration of type Foo.)
*
* If this {@code Class} object represents a class, the return value is
* an array containing objects representing the uses of interface types to
* specify interfaces implemented by the class. The order of the objects in
* the array corresponds to the order of the interface types used in the
* 'implements' clause of the declaration of this {@code Class} object.
*
* If this {@code Class} object represents an interface, the return
* value is an array containing objects representing the uses of interface
* types to specify interfaces directly extended by the interface. The
* order of the objects in the array corresponds to the order of the
* interface types used in the 'extends' clause of the declaration of this
* {@code Class} object.
*
* If this {@code Class} object represents a class or interface whose
* declaration does not explicitly indicate any annotated superinterfaces,
* the return value is an array of length 0.
*
* If this {@code Class} object represents either the {@code Object}
* class, an array type, a primitive type, or void, the return value is an
* array of length 0.
*
* @return an array representing the superinterfaces
* @since 1.8
*/
public AnnotatedType[] getAnnotatedInterfaces() {
return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
}
private native Class getNestHost0();
/**
* Returns the nest host of the nest to which the class
* or interface represented by this {@code Class} object belongs.
* Every class and interface is a member of exactly one nest.
* A class or interface that is not recorded as belonging to a nest
* belongs to the nest consisting only of itself, and is the nest
* host.
*
* Each of the {@code Class} objects representing array types,
* primitive types, and {@code void} returns {@code this} to indicate
* that the represented entity belongs to the nest consisting only of
* itself, and is the nest host.
*
* If there is a {@linkplain LinkageError linkage error} accessing
* the nest host, or if this class or interface is not enumerated as
* a member of the nest by the nest host, then it is considered to belong
* to its own nest and {@code this} is returned as the host.
*
* @apiNote A {@code class} file of version 55.0 or greater may record the
* host of the nest to which it belongs by using the {@code NestHost}
* attribute (JVMS 4.7.28). Alternatively, a {@code class} file of
* version 55.0 or greater may act as a nest host by enumerating the nest's
* other members with the
* {@code NestMembers} attribute (JVMS 4.7.29).
* A {@code class} file of version 54.0 or lower does not use these
* attributes.
*
* @return the nest host of this class or interface
*
* @throws SecurityException
* If the returned class is not the current class, and
* if a security manager, s, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for the returned class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of the returned class
* @since 11
* @jvms 4.7.28 and 4.7.29 NestHost and NestMembers attributes
* @jvms 5.4.4 Access Control
*/
@CallerSensitive
public Class getNestHost() {
if (isPrimitive() || isArray()) {
return this;
}
Class host;
try {
host = getNestHost0();
} catch (LinkageError e) {
// if we couldn't load our nest-host then we
// act as-if we have no nest-host attribute
return this;
}
// if null then nest membership validation failed, so we
// act as-if we have no nest-host attribute
if (host == null || host == this) {
return this;
}
// returning a different class requires a security check
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkPackageAccess(sm,
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
}
return host;
}
/**
* Determines if the given {@code Class} is a nestmate of the
* class or interface represented by this {@code Class} object.
* Two classes or interfaces are nestmates
* if they have the same {@linkplain #getNestHost() nest host}.
*
* @param c the class to check
* @return {@code true} if this class and {@code c} are members of
* the same nest; and {@code false} otherwise.
*
* @since 11
*/
public boolean isNestmateOf(Class c) {
if (this == c) {
return true;
}
if (isPrimitive() || isArray() ||
c.isPrimitive() || c.isArray()) {
return false;
}
try {
return getNestHost0() == c.getNestHost0();
} catch (LinkageError e) {
return false;
}
}
private native Class[] getNestMembers0();
/**
* Returns an array containing {@code Class} objects representing all the
* classes and interfaces that are members of the nest to which the class
* or interface represented by this {@code Class} object belongs.
* The {@linkplain #getNestHost() nest host} of that nest is the zeroth
* element of the array. Subsequent elements represent any classes or
* interfaces that are recorded by the nest host as being members of
* the nest; the order of such elements is unspecified. Duplicates are
* permitted.
* If the nest host of that nest does not enumerate any members, then the
* array has a single element containing {@code this}.
*
* Each of the {@code Class} objects representing array types,
* primitive types, and {@code void} returns an array containing only
* {@code this}.
*
* This method validates that, for each class or interface which is
* recorded as a member of the nest by the nest host, that class or
* interface records itself as a member of that same nest. Any exceptions
* that occur during this validation are rethrown by this method.
*
* @return an array of all classes and interfaces in the same nest as
* this class
*
* @throws LinkageError
* If there is any problem loading or validating a nest member or
* its nest host
* @throws SecurityException
* If any returned class is not the current class, and
* if a security manager, s, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for that returned class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of that returned class
*
* @since 11
* @see #getNestHost()
*/
@CallerSensitive
public Class[] getNestMembers() {
if (isPrimitive() || isArray()) {
return new Class[] { this };
}
Class[] members = getNestMembers0();
// Can't actually enable this due to bootstrapping issues
// assert(members.length != 1 || members[0] == this); // expected invariant from VM
if (members.length > 1) {
// If we return anything other than the current class we need
// a security check
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkPackageAccess(sm,
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
}
}
return members;
}
/**
* Returns the type descriptor string for this class.
*
* Note that this is not a strict inverse of {@link #forName};
* distinct classes which share a common name but have different class loaders
* will have identical descriptor strings.
*
* @return the type descriptor representation
* @jvms 4.3.2 Field Descriptors
* @since 12
*/
@Override
public String descriptorString() {
if (isPrimitive())
return Wrapper.forPrimitiveType(this).basicTypeString();
else if (isArray()) {
return "[" + componentType.descriptorString();
}
else {
return "L" + getName().replace('.', '/') + ";";
}
}
/**
* Returns the component type of this {@code Class}, if it describes
* an array type, or {@code null} otherwise.
*
* @implSpec
* Equivalent to {@link Class#getComponentType()}.
*
* @return a {@code Class} describing the component type, or {@code null}
* if this {@code Class} does not describe an array type
* @since 12
*/
@Override
public Class componentType() {
return isArray() ? componentType : null;
}
/**
* Returns a {@code Class} for an array type whose component type
* is described by this {@linkplain Class}.
*
* @return a {@code Class} describing the array type
* @since 12
*/
@Override
public Class arrayType() {
return Array.newInstance(this, 0).getClass();
}
/**
* Returns a nominal descriptor for this instance, if one can be
* constructed, or an empty {@link Optional} if one cannot be.
*
* @return An {@link Optional} containing the resulting nominal descriptor,
* or an empty {@link Optional} if one cannot be constructed.
* @since 12
*/
@Override
public Optional{@code
* clazz.newInstance()
* }
*
* can be replaced by
*
* {@code
* clazz.getDeclaredConstructor().newInstance()
* }
*
* The latter sequence of calls is inferred to be able to throw
* the additional exception types {@link
* InvocationTargetException} and {@link
* NoSuchMethodException}. Both of these exception types are
* subclasses of {@link ReflectiveOperationException}.
*
* @return a newly allocated instance of the class represented by this
* object.
* @throws IllegalAccessException if the class or its nullary
* constructor is not accessible.
* @throws InstantiationException
* if this {@code Class} represents an abstract class,
* an interface, an array class, a primitive type, or void;
* or if the class has no nullary constructor;
* or if the instantiation fails for some other reason.
* @throws ExceptionInInitializerError if the initialization
* provoked by this method fails.
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*/
@CallerSensitive
@Deprecated(since="9")
public T newInstance()
throws InstantiationException, IllegalAccessException
{
if (this.isValue()) {
throw new IllegalAccessException(
"cannot create new instance of an inline class " + this.getName());
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
}
// Constructor lookup
Constructor
*
*
*
*
*
Element Type Encoding
* boolean Z
* byte B
* char C
* class or interface
* Lclassname;
* {@linkplain #asValueType() regular value class}
* Qclassname;
* double D
* float F
* int I
* long J
* short S
*
*
* @return the name of the class or interface
* represented by this object.
*/
public String getName() {
String name = this.name;
return name != null ? name : initClassName();
}
// Cache the name to reduce the number of calls into the VM.
// This field would be set by VM itself during initClassName call.
private transient String name;
private native String initClassName();
/**
* Returns the class loader for the class. Some implementations may use
* null to represent the bootstrap class loader. This method will return
* null in such implementations if this class was loaded by the bootstrap
* class loader.
*
*
* String.class.getName()
* returns "java.lang.String"
* byte.class.getName()
* returns "byte"
* Point.class.getName()
* returns "p.Point"
* (new Object[3]).getClass().getName()
* returns "[Ljava.lang.Object;"
* (new Point[3]).getClass().getName()
* returns "[QPoint;"
* (new int[3][4][5][6][7][8][9]).getClass().getName()
* returns "[[[[[[[I"
*
* {@code class Shimmer implements FloorWax, DessertTopping { ... }}
*
* suppose the value of {@code s} is an instance of
* {@code Shimmer}; the value of the expression:
*
* {@code s.getClass().getInterfaces()[0]}
*
* is the {@code Class} object that represents interface
* {@code FloorWax}; and the value of:
*
* {@code s.getClass().getInterfaces()[1]}
*
* is the {@code Class} object that represents interface
* {@code DessertTopping}.
*
*
*
*
* @since 1.5
*/
@CallerSensitive
public Method getEnclosingMethod() throws SecurityException {
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
if (enclosingInfo == null)
return null;
else {
if (!enclosingInfo.isMethod())
return null;
MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
getFactory());
Class returnType = toClass(typeInfo.getReturnType());
Type [] parameterTypes = typeInfo.getParameterTypes();
Class[] parameterClasses = new Class[parameterTypes.length];
// Convert Types to Classes; returned types *should*
// be class objects since the methodDescriptor's used
// don't have generics information
for(int i = 0; i < parameterClasses.length; i++)
parameterClasses[i] = toClass(parameterTypes[i]);
// Perform access check
final Class enclosingCandidate = enclosingInfo.getEnclosingClass();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
Reflection.getCallerClass(), true);
}
Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false);
/*
* Loop over all declared methods; match method name,
* number of and type of parameters, *and* return
* type. Matching return type is also necessary
* because of covariant returns, etc.
*/
ReflectionFactory fact = getReflectionFactory();
for (Method m : candidates) {
if (m.getName().equals(enclosingInfo.getName()) &&
arrayContentsEq(parameterClasses,
fact.getExecutableSharedParameterTypes(m))) {
// finally, check return type
if (m.getReturnType().equals(returnType)) {
return fact.copyMethod(m);
}
}
}
throw new InternalError("Enclosing method not found");
}
}
private native Object[] getEnclosingMethod0();
private EnclosingMethodInfo getEnclosingMethodInfo() {
Object[] enclosingInfo = getEnclosingMethod0();
if (enclosingInfo == null)
return null;
else {
return new EnclosingMethodInfo(enclosingInfo);
}
}
private static final class EnclosingMethodInfo {
private final Class enclosingClass;
private final String name;
private final String descriptor;
static void validate(Object[] enclosingInfo) {
if (enclosingInfo.length != 3)
throw new InternalError("Malformed enclosing method information");
try {
// The array is expected to have three elements:
// the immediately enclosing class
Class enclosingClass = (Class)enclosingInfo[0];
assert(enclosingClass != null);
// the immediately enclosing method or constructor's
// name (can be null).
String name = (String)enclosingInfo[1];
// the immediately enclosing method or constructor's
// descriptor (null iff name is).
String descriptor = (String)enclosingInfo[2];
assert((name != null && descriptor != null) || name == descriptor);
} catch (ClassCastException cce) {
throw new InternalError("Invalid type in enclosing method information", cce);
}
}
EnclosingMethodInfo(Object[] enclosingInfo) {
validate(enclosingInfo);
this.enclosingClass = (Class)enclosingInfo[0];
this.name = (String)enclosingInfo[1];
this.descriptor = (String)enclosingInfo[2];
}
boolean isPartial() {
return enclosingClass == null || name == null || descriptor == null;
}
boolean isConstructor() { return !isPartial() && "
*
*
* @since 1.5
*/
@CallerSensitive
public Constructor getEnclosingConstructor() throws SecurityException {
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
if (enclosingInfo == null)
return null;
else {
if (!enclosingInfo.isConstructor())
return null;
ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
getFactory());
Type [] parameterTypes = typeInfo.getParameterTypes();
Class[] parameterClasses = new Class[parameterTypes.length];
// Convert Types to Classes; returned types *should*
// be class objects since the methodDescriptor's used
// don't have generics information
for(int i = 0; i < parameterClasses.length; i++)
parameterClasses[i] = toClass(parameterTypes[i]);
// Perform access check
final Class enclosingCandidate = enclosingInfo.getEnclosingClass();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
Reflection.getCallerClass(), true);
}
Constructor[] candidates = enclosingCandidate
.privateGetDeclaredConstructors(false);
/*
* Loop over all declared constructors; match number
* of and type of parameters.
*/
ReflectionFactory fact = getReflectionFactory();
for (Constructor c : candidates) {
if (arrayContentsEq(parameterClasses,
fact.getExecutableSharedParameterTypes(c))) {
return fact.copyConstructor(c);
}
}
throw new InternalError("Enclosing constructor not found");
}
}
/**
* If the class or interface represented by this {@code Class} object
* is a member of another class, returns the {@code Class} object
* representing the class in which it was declared. This method returns
* null if this class or interface is not a member of any other class. If
* this {@code Class} object represents an array class, a primitive
* type, or void,then this method returns null.
*
* @return the declaring class for this class
* @throws SecurityException
* If a security manager, s, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for the declaring class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of the declaring class
* @since 1.1
*/
@CallerSensitive
public Class getDeclaringClass() throws SecurityException {
final Class candidate = getDeclaringClass0();
if (candidate != null) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
candidate.checkPackageAccess(sm,
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
}
}
return candidate;
}
private native Class getDeclaringClass0();
/**
* Returns the immediately enclosing class of the underlying
* class. If the underlying class is a top level class this
* method returns {@code null}.
* @return the immediately enclosing class of the underlying class
* @exception SecurityException
* If a security manager, s, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for the enclosing class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of the enclosing class
* @since 1.5
*/
@CallerSensitive
public Class getEnclosingClass() throws SecurityException {
// There are five kinds of classes (or interfaces):
// a) Top level classes
// b) Nested classes (static member classes)
// c) Inner classes (non-static member classes)
// d) Local classes (named classes declared within a method)
// e) Anonymous classes
// JVM Spec 4.7.7: A class must have an EnclosingMethod
// attribute if and only if it is a local class or an
// anonymous class.
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
Class enclosingCandidate;
if (enclosingInfo == null) {
// This is a top level or a nested class or an inner class (a, b, or c)
enclosingCandidate = getDeclaringClass0();
} else {
Class enclosingClass = enclosingInfo.getEnclosingClass();
// This is a local class or an anonymous class (d or e)
if (enclosingClass == this || enclosingClass == null)
throw new InternalError("Malformed enclosing method information");
else
enclosingCandidate = enclosingClass;
}
if (enclosingCandidate != null) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
enclosingCandidate.checkPackageAccess(sm,
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
}
}
return enclosingCandidate;
}
/**
* Returns the simple name of the underlying class as given in the
* source code. Returns an empty string if the underlying class is
* anonymous.
*
*
*
*
* @apiNote There may be more than one method with a particular name
* and parameter types in a class because while the Java language forbids a
* class to declare multiple methods with the same signature but different
* return types, the Java virtual machine does not. This
* increased flexibility in the virtual machine can be used to
* implement various language features. For example, covariant
* returns can be implemented with {@linkplain
* java.lang.reflect.Method#isBridge bridge methods}; the bridge
* method and the overriding method would have the same
* signature but different return types.
*
* @return the array of {@code Method} objects representing the
* public methods of this class
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since 1.1
*/
@CallerSensitive
public Method[] getMethods() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
}
return copyMethods(privateGetPublicMethods());
}
/**
* Returns an array containing {@code Constructor} objects reflecting
* all the public constructors of the class represented by this
* {@code Class} object. An array of length 0 is returned if the
* class has no public constructors, or if the class is an array class, or
* if the class reflects a primitive type or void.
*
* Note that while this method returns an array of {@code
* Constructor
*
*
*
*
*
*
*
* @apiNote There may be more than one method with matching name and
* parameter types in a class because while the Java language forbids a
* class to declare multiple methods with the same signature but different
* return types, the Java virtual machine does not. This
* increased flexibility in the virtual machine can be used to
* implement various language features. For example, covariant
* returns can be implemented with {@linkplain
* java.lang.reflect.Method#isBridge bridge methods}; the bridge
* method and the overriding method would have the same
* signature but different return types. This method would return the
* overriding method as it would have a more specific return type.
*
* @param name the name of the method
* @param parameterTypes the list of parameters
* @return the {@code Method} object that matches the specified
* {@code name} and {@code parameterTypes}
* @throws NoSuchMethodException if a matching method is not found
* or if the name is "<init>"or "<clinit>".
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, s, is present and
* the caller's class loader is not the same as or an
* ancestor of the class loader for the current class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of this class.
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since 1.1
*/
@CallerSensitive
public Method getMethod(String name, Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
Objects.requireNonNull(name);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
}
Method method = getMethod0(name, parameterTypes);
if (method == null) {
throw new NoSuchMethodException(methodToString(name, parameterTypes));
}
return getReflectionFactory().copyMethod(method);
}
/**
* Returns a {@code Constructor} object that reflects the specified
* public constructor of the class represented by this {@code Class}
* object. The {@code parameterTypes} parameter is an array of
* {@code Class} objects that identify the constructor's formal
* parameter types, in declared order.
*
* If this {@code Class} object represents an inner class
* declared in a non-static context, the formal parameter types
* include the explicit enclosing instance as the first parameter.
*
*
*
*
*
*
*
* @since 1.1
*/
@CallerSensitive
public Class[] getDeclaredClasses() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false);
}
return getDeclaredClasses0();
}
/**
* Returns an array of {@code Field} objects reflecting all the fields
* declared by the class or interface represented by this
* {@code Class} object. This includes public, protected, default
* (package) access, and private fields, but excludes inherited fields.
*
*
*
*
*
* @since 1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@CallerSensitive
public Field[] getDeclaredFields() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
}
return copyFields(privateGetDeclaredFields(false));
}
/**
* Returns an array containing {@code Method} objects reflecting all the
* declared methods of the class or interface represented by this {@code
* Class} object, including public, protected, default (package)
* access, and private methods, but excluding inherited methods.
*
*
*
*
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since 1.1
*/
@CallerSensitive
public Method[] getDeclaredMethods() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
}
return copyMethods(privateGetDeclaredMethods(false));
}
/**
* Returns an array of {@code Constructor} objects reflecting all the
* constructors declared by the class represented by this
* {@code Class} object. These are public, protected, default
* (package) access, and private constructors. The elements in the array
* returned are not sorted and are not in any particular order. If the
* class has a default constructor, it is included in the returned array.
* This method returns an array of length 0 if this {@code Class}
* object represents an interface, a primitive type, an array class, or
* void.
*
*
*
*
*
* @since 1.1
*/
@CallerSensitive
public Constructor[] getDeclaredConstructors() throws SecurityException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
}
return copyConstructors(privateGetDeclaredConstructors(false));
}
/**
* Returns a {@code Field} object that reflects the specified declared
* field of the class or interface represented by this {@code Class}
* object. The {@code name} parameter is a {@code String} that specifies
* the simple name of the desired field.
*
*
*
*
*
* @since 1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@CallerSensitive
public Field getDeclaredField(String name)
throws NoSuchFieldException, SecurityException {
Objects.requireNonNull(name);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
}
Field field = searchFields(privateGetDeclaredFields(false), name);
if (field == null) {
throw new NoSuchFieldException(name);
}
return getReflectionFactory().copyField(field);
}
/**
* Returns a {@code Method} object that reflects the specified
* declared method of the class or interface represented by this
* {@code Class} object. The {@code name} parameter is a
* {@code String} that specifies the simple name of the desired
* method, and the {@code parameterTypes} parameter is an array of
* {@code Class} objects that identify the method's formal parameter
* types, in declared order. If more than one method with the same
* parameter types is declared in a class, and one of these methods has a
* return type that is more specific than any of the others, that method is
* returned; otherwise one of the methods is chosen arbitrarily. If the
* name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
* is raised.
*
*
*
*
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since 1.1
*/
@CallerSensitive
public Method getDeclaredMethod(String name, Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
Objects.requireNonNull(name);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
}
Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
if (method == null) {
throw new NoSuchMethodException(methodToString(name, parameterTypes));
}
return getReflectionFactory().copyMethod(method);
}
/**
* Returns the list of {@code Method} objects for the declared public
* methods of this class or interface that have the specified method name
* and parameter types.
*
* @param name the name of the method
* @param parameterTypes the parameter array
* @return the list of {@code Method} objects for the public methods of
* this class matching the specified name and parameters
*/
List
*
*
*
* @since 1.1
*/
@CallerSensitive
public Constructor
*
*
*
* @param name name of the desired resource
* @return A {@link java.io.InputStream} object; {@code null} if no
* resource with this name is found, the resource is in a package
* that is not {@linkplain Module#isOpen(String, Module) open} to at
* least the caller module, or access to the resource is denied
* by the security manager.
* @throws NullPointerException If {@code name} is {@code null}
*
* @see Module#getResourceAsStream(String)
* @since 1.1
* @revised 9
* @spec JPMS
*/
@CallerSensitive
public InputStream getResourceAsStream(String name) {
name = resolveName(name);
Module thisModule = getModule();
if (thisModule.isNamed()) {
// check if resource can be located by caller
if (Resources.canEncapsulate(name)
&& !isOpenToCaller(name, Reflection.getCallerClass())) {
return null;
}
// resource not encapsulated or in package open to caller
String mn = thisModule.getName();
ClassLoader cl = getClassLoader0();
try {
// special-case built-in class loaders to avoid the
// need for a URL connection
if (cl == null) {
return BootLoader.findResourceAsStream(mn, name);
} else if (cl instanceof BuiltinClassLoader) {
return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
} else {
URL url = cl.findResource(mn, name);
return (url != null) ? url.openStream() : null;
}
} catch (IOException | SecurityException e) {
return null;
}
}
// unnamed module
ClassLoader cl = getClassLoader0();
if (cl == null) {
return ClassLoader.getSystemResourceAsStream(name);
} else {
return cl.getResourceAsStream(name);
}
}
/**
* Finds a resource with a given name.
*
* '\u002f'), then the absolute name of the resource is the
* portion of the {@code name} following the {@code '/'}.
*
*
* {@code modified_package_name/name}
*
*
* '\u002e').
*
*
*
*
*
* @param name name of the desired resource
* @return A {@link java.net.URL} object; {@code null} if no resource with
* this name is found, the resource cannot be located by a URL, the
* resource is in a package that is not
* {@linkplain Module#isOpen(String, Module) open} to at least the caller
* module, or access to the resource is denied by the security
* manager.
* @throws NullPointerException If {@code name} is {@code null}
* @since 1.1
* @revised 9
* @spec JPMS
*/
@CallerSensitive
public URL getResource(String name) {
name = resolveName(name);
Module thisModule = getModule();
if (thisModule.isNamed()) {
// check if resource can be located by caller
if (Resources.canEncapsulate(name)
&& !isOpenToCaller(name, Reflection.getCallerClass())) {
return null;
}
// resource not encapsulated or in package open to caller
String mn = thisModule.getName();
ClassLoader cl = getClassLoader0();
try {
if (cl == null) {
return BootLoader.findResource(mn, name);
} else {
return cl.findResource(mn, name);
}
} catch (IOException ioe) {
return null;
}
}
// unnamed module
ClassLoader cl = getClassLoader0();
if (cl == null) {
return ClassLoader.getSystemResource(name);
} else {
return cl.getResource(name);
}
}
/**
* Returns true if a resource with the given name can be located by the
* given caller. All resources in a module can be located by code in
* the module. For other callers, then the package needs to be open to
* the caller.
*/
private boolean isOpenToCaller(String name, Class caller) {
// assert getModule().isNamed();
Module thisModule = getModule();
Module callerModule = (caller != null) ? caller.getModule() : null;
if (callerModule != thisModule) {
String pn = Resources.toPackageName(name);
if (thisModule.getDescriptor().packages().contains(pn)) {
if (callerModule == null && !thisModule.isOpen(pn)) {
// no caller, package not open
return false;
}
if (!thisModule.isOpen(pn, callerModule)) {
// package not open to caller
return false;
}
}
}
return true;
}
/** protection domain returned when the internal domain is null */
private static java.security.ProtectionDomain allPermDomain;
/**
* Returns the {@code ProtectionDomain} of this class. If there is a
* security manager installed, this method first calls the security
* manager's {@code checkPermission} method with a
* {@code RuntimePermission("getProtectionDomain")} permission to
* ensure it's ok to get the
* {@code ProtectionDomain}.
*
* @return the ProtectionDomain of this class
*
* @throws SecurityException
* if a security manager exists and its
* {@code checkPermission} method doesn't allow
* getting the ProtectionDomain.
*
* @see java.security.ProtectionDomain
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
* @since 1.2
*/
public java.security.ProtectionDomain getProtectionDomain() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
}
java.security.ProtectionDomain pd = getProtectionDomain0();
if (pd == null) {
if (allPermDomain == null) {
java.security.Permissions perms =
new java.security.Permissions();
perms.add(SecurityConstants.ALL_PERMISSION);
allPermDomain =
new java.security.ProtectionDomain(null, perms);
}
pd = allPermDomain;
}
return pd;
}
/**
* Returns the ProtectionDomain of this class.
*/
private native java.security.ProtectionDomain getProtectionDomain0();
/*
* Return the Virtual Machine's Class object for the named
* primitive type.
*/
static native Class getPrimitiveClass(String name);
/*
* Check if client is allowed to access members. If access is denied,
* throw a SecurityException.
*
* This method also enforces package access.
*
* '\u002f'), then the absolute name of the resource is the
* portion of the {@code name} following the {@code '/'}.
*
*
* {@code modified_package_name/name}
*
*
* '\u002e').
*
*
* {@code TC_CLASS} ClassDescriptor
* A ClassDescriptor is a special cased serialization of
* a {@code java.io.ObjectStreamClass} instance.
*
* A new handle is generated for the initial time the class descriptor
* is written into the stream. Future references to the class descriptor
* are written as references to the initial class descriptor instance.
*
* @see java.io.ObjectStreamClass
*/
private static final ObjectStreamField[] serialPersistentFields =
new ObjectStreamField[0];
/**
* Returns the assertion status that would be assigned to this
* class if it were to be initialized at the time this method is invoked.
* If this class has had its assertion status set, the most recent
* setting will be returned; otherwise, if any package default assertion
* status pertains to this class, the most recent setting for the most
* specific pertinent package default assertion status is returned;
* otherwise, if this class is not a system class (i.e., it has a
* class loader) its class loader's default assertion status is returned;
* otherwise, the system class default assertion status is returned.
*