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  1. import java.lang.reflect.Field;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) throws Exception {
  5.         Class cache = Integer.class.getDeclaredClasses()[0];
  6.         Field c = cache.getDeclaredField("cache");
  7.         c.setAccessible(true);
  8.         Integer[] array = (Integer[]) c.get(cache);
  9.         array[132] = array[133];
  10.  
  11.         System.out.printf("%d",2 + 2);
  12.     }
  13. }
Success #stdin #stdout #stderr 0.1s 54240KB
comments (?)
stdin 
Standard input is empty
stdout 
5
stderr 
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by Main (file:/home/HeeJwA/tested.zip) to field java.lang.Integer$IntegerCache.cache
WARNING: Please consider reporting this to the maintainers of Main
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
https://ideone.com/rhkTpc
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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