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  1. /* package whatever; // don't place package name! */
  2.  
  3. import javax.tools.ToolProvider;
  4. import java.lang.invoke.MethodHandles;
  5.  
  6. /* Name of the class has to be "Main" only if the class is public. */
  7. class Ideone extends Superclass {
  8.     public static void main (String[] args) throws java.lang.Exception {
  9.         // unqualified invocation of staticMethod() in the context of Ideone
  10.         staticMethod();
  11.         // qualified invocation using Ideone.staticMethod()
  12.         Ideone.staticMethod();
  13.         // qualified invocation using Superclass.staticMethod() (the declaring class)
  14.         Superclass.staticMethod();
  15.         // other example: invoking java.awt.Window.getWindows() via javax.swing.JFrame target
  16.         javax.swing.JFrame.getWindows();
  17.     }
  18.     private Ideone() {}
  19. }
  20. class Superclass {
  21.     static boolean disassembled;
  22.     static void staticMethod() {
  23.         if(!disassembled) {
  24.             disassembled = true;
  25.             disasm();
  26.         }
  27.     }
  28.     private static void disasm() {
  29.         try {
  30.             MethodHandles.lookup().unreflect(
  31.                 Class.forName("com.sun.tools.javap.Main", false, ToolProvider.getSystemToolClassLoader())
  32.                 .getMethod("main", String[].class))
  33.                 .asVarargsCollector(String[].class)
  34.                 .invoke("-c", Ideone.class.getName());
  35.         } catch(Throwable t) { t.printStackTrace(); }
  36.     }
  37. }
Success #stdin #stdout 1s 72316KB
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Compiled from "Main.java"
class Ideone extends Superclass {
  public static void main(java.lang.String[]) throws java.lang.Exception;
    Code:
       0: invokestatic  #1                  // Method staticMethod:()V
       3: invokestatic  #1                  // Method staticMethod:()V
       6: invokestatic  #2                  // Method Superclass.staticMethod:()V
       9: invokestatic  #3                  // Method javax/swing/JFrame.getWindows:()[Ljava/awt/Window;
      12: pop
      13: return
}
https://ideone.com/n9Caa2
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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