Integer a = 1000;
Integer b = 2000;
swap(a, b); //实现该函数,使得a,b的值交换
System.out.println(a + "-" + b + "-" + a.getClass());
static void swap(Integer a, Integer b) {
int temp = a;
try {
Class clazz = a.getClass();
Field value = clazz.getDeclaredField("value");
value.setAccessible(true);
value.setInt(a, b);
value.setInt(b, temp);
} catch (Exception ex) {
ex.printStackTrace();
}
}
http://www.blogjava.net/sundc/archive/2013/06/08/400382.html
From:https://www.cnblogs.com/xuejianxiyang/p/9155397.html