The first example shows a stack trace element consisting of * three elements, each separated by {@code "/"} followed with * the source file name and the line number of the source line * containing the execution point. * * The first element "{@code com.foo.loader}" is * the name of the class loader. The second element "{@code foo@9.0}" * is the module name and version. The third element is the method * containing the execution point; "{@code com.foo.Main"}" is the * fully-qualified class name and "{@code run}" is the name of the method. * "{@code Main.java}" is the source file name and "{@code 101}" is * the line number. * *
If a class is defined in an unnamed module * then the second element is omitted as shown in * "{@code com.foo.loader//com.foo.bar.App.run(App.java:12)}". * *
If the class loader is a * built-in class loader or is not named then the first element * and its following {@code "/"} are omitted as shown in * "{@code acme@2.1/org.acme.Lib.test(Lib.java:80)}". * If the first element is omitted and the module is an unnamed module, * the second element and its following {@code "/"} are also omitted * as shown in "{@code MyClass.mash(MyClass.java:9)}". * *
The {@code toString} method may return two different values on two * {@code StackTraceElement} instances that are * {@linkplain #equals(Object) equal}, for example one created via the * constructor, and one obtained from {@link java.lang.Throwable} or * {@link java.lang.StackWalker.StackFrame}, where an implementation may * choose to omit some element in the returned string. * * @revised 9 * @spec JPMS * @see Throwable#printStackTrace() */ public String toString() { String s = ""; if (!dropClassLoaderName() && classLoaderName != null && !classLoaderName.isEmpty()) { s += classLoaderName + "/"; } if (moduleName != null && !moduleName.isEmpty()) { s += moduleName; if (!dropModuleVersion() && moduleVersion != null && !moduleVersion.isEmpty()) { s += "@" + moduleVersion; } } s = s.isEmpty() ? declaringClass : s + "/" + declaringClass; return s + "." + methodName + "(" + (isNativeMethod() ? "Native Method)" : (fileName != null && lineNumber >= 0 ? fileName + ":" + lineNumber + ")" : (fileName != null ? ""+fileName+")" : "Unknown Source)"))); } /** * Returns true if the specified object is another * {@code StackTraceElement} instance representing the same execution * point as this instance. Two stack trace elements {@code a} and * {@code b} are equal if and only if: *
{@code
* equals(a.getClassLoaderName(), b.getClassLoaderName()) &&
* equals(a.getModuleName(), b.getModuleName()) &&
* equals(a.getModuleVersion(), b.getModuleVersion()) &&
* equals(a.getClassName(), b.getClassName()) &&
* equals(a.getMethodName(), b.getMethodName())
* equals(a.getFileName(), b.getFileName()) &&
* a.getLineNumber() == b.getLineNumber()
*
* }
* where {@code equals} has the semantics of {@link
* java.util.Objects#equals(Object, Object) Objects.equals}.
*
* @param obj the object to be compared with this stack trace element.
* @return true if the specified object is another
* {@code StackTraceElement} instance representing the same
* execution point as this instance.
*
* @revised 9
* @spec JPMS
*/
public boolean equals(Object obj) {
if (obj==this)
return true;
if (!(obj instanceof StackTraceElement))
return false;
StackTraceElement e = (StackTraceElement)obj;
return Objects.equals(classLoaderName, e.classLoaderName) &&
Objects.equals(moduleName, e.moduleName) &&
Objects.equals(moduleVersion, e.moduleVersion) &&
e.declaringClass.equals(declaringClass) &&
e.lineNumber == lineNumber &&
Objects.equals(methodName, e.methodName) &&
Objects.equals(fileName, e.fileName);
}
/**
* Returns a hash code value for this stack trace element.
*/
public int hashCode() {
int result = 31*declaringClass.hashCode() + methodName.hashCode();
result = 31*result + Objects.hashCode(classLoaderName);
result = 31*result + Objects.hashCode(moduleName);
result = 31*result + Objects.hashCode(moduleVersion);
result = 31*result + Objects.hashCode(fileName);
result = 31*result + lineNumber;
return result;
}
/**
* Called from of() methods to set the 'format' bitmap using the Class
* reference stored in declaringClassObject, and then clear the reference.
*
* * If the module is a non-upgradeable JDK module, then set * JDK_NON_UPGRADEABLE_MODULE to omit its version string. *
* If the loader is one of the built-in loaders (`boot`, `platform`, or `app`)
* then set BUILTIN_CLASS_LOADER to omit the first element (`
* This method returns false when running on the exploded image
* since JDK modules are not hashed. They have no Version attribute
* and so "@