https://www.v2ex.com/t/226832

Test.java

	public static void main(String[] args) throws Exception {
		Class<?> cache = Class.forName("java.lang.Integer$IntegerCache");
		Field field = cache.getDeclaredField("cache");
		field.setAccessible(true);
		Object value = field.get(null);
		Array.set(value, 130, 3);
		Integer result = 1 + 1;
		System.out.println("1 + 1 = " + result);
	}