DestroyInt.java

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;


public class DestroyInt {

	public static void main(String[] args) throws Throwable {
		
		Class<?> cache = Integer.class.getDeclaredClasses()[0];
		
        	Field c = cache.getDeclaredField("cache");

        	nonFinal(c);
        
        	c.setAccessible(true);
        
        	Integer[] array = (Integer[]) c.get(null);
        
        	array = array.clone();

        	List<Integer> list = Arrays.asList(array);
        
        	Collections.shuffle(list);
        
        	c.set(null, list.toArray(new Integer[list.size()]));
        
        	System.out.printf("2 + 2 = %d", 2 + 2);

	}

	public static void nonFinal(Field f) throws Throwable{
		
		Field mod = Field.class.getDeclaredField("modifiers");
		
		mod.setAccessible(true);
		
		mod.setInt(f, f.getModifiers() & ~Modifier.FINAL);
		
	}
	
}