交换两个Integer的值

 public static void main(String[] args) throws Exception {
        Integer a = 128;
        Integer b = 130;
        System.out.println("a: " + a + " b: " + b);
        swap(a, b);
        System.out.println("a: " + a + " b: " + b);
    }

    private static void swap(Integer i, Integer j) throws Exception {
        Field field = Integer.class.getDeclaredField("value");
        field.setAccessible(true);
        int tmp = j;
        field.set(j, i); //将j对象的value字段设置为i
        field.set(i, tmp); //将i对象的value字段设置为tmp
    }