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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import sun.misc.Unsafe;
  8. import java.lang.reflect.Constructor;
  9. import java.lang.reflect.InvocationTargetException;
  10.  
  11. /* Name of the class has to be "Main" only if the class is public. */
  12. class Ideone
  13. {
  14. 	public static void main (String[] args) throws java.lang.Exception
  15. 	{
  16. 		new Accessor().run();
  17. 	}
  18. }
  19.  
  20. class Data{
  21.     int x = 0;
  22. }
  23.  
  24. class Accessor{
  25. 	private Data data;
  26. 	private Object base;
  27. 	private long off;
  28. 	public static final Unsafe unsafe;
  29.  
  30. 	public void run(){
  31. 	    data = new Data();
  32.  
  33. 	    base = data;
  34. 	    off = 12;
  35.  
  36. 	    unsafe.putInt(base,off,1);
  37. 	    assert(data.x == 1);
  38. 	}
  39.  
  40.     static{
  41.         try {
  42.             Constructor<Unsafe> unsafeConstructor = Unsafe.class.getDeclaredConstructor();
  43.             unsafeConstructor.setAccessible(true);
  44.             unsafe = unsafeConstructor.newInstance();
  45.         } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException | InstantiationException e) {
  46.             throw new RuntimeException(e);
  47.         }
  48.     }
  49. }
  50.  
Success #stdin #stdout 0.04s 4386816KB
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https://ideone.com/OasQrh
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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