挖坑神器

Class<?> clazz = Class.forName(
    "java.lang.Integer$IntegerCache");
Field field = clazz.getDeclaredField("cache");
field.setAccessible(true);
Integer[] cache = (Integer[]) field.get(clazz);

// Rewrite the Integer cache
for (int i = 0; i < cache.length; i++) {
  cache[i] = new Integer(
      new Random().nextInt(cache.length));
}
for (int i = 0; i < 10; i++) {
  System.out.println((Integer) i);
}