src/java.base/share/classes/java/lang/Class.java

@@ -1310,11 +1310,11 @@
         // c) Inner classes (non-static member classes)
         // d) Local classes (named classes declared within a method)
         // e) Anonymous classes
 
 
-        // JVM Spec 4.8.6: A class must have an EnclosingMethod
+        // 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;
 

@@ -1355,32 +1355,11 @@
         String simpleName = getSimpleBinaryName();
         if (simpleName == null) { // top level class
             simpleName = getName();
             return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name
         }
-        // According to JLS3 "Binary Compatibility" (13.1) the binary
-        // name of non-package classes (not top level) is the binary
-        // name of the immediately enclosing class followed by a '$' followed by:
-        // (for nested and inner classes): the simple name.
-        // (for local classes): 1 or more digits followed by the simple name.
-        // (for anonymous classes): 1 or more digits.
-
-        // Since getSimpleBinaryName() will strip the binary name of
-        // the immediately enclosing class, we are now looking at a
-        // string that matches the regular expression "\$[0-9]*"
-        // followed by a simple name (considering the simple of an
-        // anonymous class to be the empty string).
-
-        // Remove leading "\$[0-9]*" from the name
-        int length = simpleName.length();
-        if (length < 1 || simpleName.charAt(0) != '$')
-            throw new InternalError("Malformed class name");
-        int index = 1;
-        while (index < length && isAsciiDigit(simpleName.charAt(index)))
-            index++;
-        // Eventually, this is the empty string iff this is an anonymous class
-        return simpleName.substring(index);
+        return simpleName;
     }
 
     /**
      * Return an informative string for the name of this type.
      *

@@ -1487,24 +1466,24 @@
      */
     private String getSimpleBinaryName() {
         Class<?> enclosingClass = getEnclosingClass();
         if (enclosingClass == null) // top level class
             return null;
-        // Otherwise, strip the enclosing class' name
-        try {
-            return getName().substring(enclosingClass.getName().length());
-        } catch (IndexOutOfBoundsException ex) {
-            throw new InternalError("Malformed class name", ex);
-        }
+        String name = getSimpleBinaryName0();
+        if (name == null) // anonymous class
+            return "";
+        return name;
     }
 
+    private native String getSimpleBinaryName0();
+
     /**
      * Returns {@code true} if this is a local class or an anonymous
      * class.  Returns {@code false} otherwise.
      */
     private boolean isLocalOrAnonymousClass() {
-        // JVM Spec 4.8.6: A class must have an EnclosingMethod
+        // 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.
         return getEnclosingMethodInfo() != null;
     }