Synchronized锁不住Integer

/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2022. All rights reserved.
 */
package com.huanghe.thread;
/**
 * 功能描述
 *
 * @author h00518386
 * @since 2022-01-14
 */
public class TicketConsumer implements Runnable {
    private Integer i;
    public TicketConsumer(int i) {
        super();
        this.i = i;
    }
    @Override
    public void run() {
        while (true) {
            // 1、张三拿到锁，i=7， 3、此时锁对象发送改变，李四也可以进来
            System.out.println(Thread.currentThread().getName() + i + "锁对象before：" + System.identityHashCode(i));
            synchronized (i) {
                System.out.println(Thread.currentThread().getName() + i + "锁对象：" + System.identityHashCode(i));
                if (i > 0) {
                    try {
                        Thread.sleep(100);    // 模拟抢票延迟
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    // 2、张三此时的i = 7, 打印 “ 张三抢到了第7张票 ”
                    // 3、计算i--,得到 i = 6导致i的hashcode发生改变，锁对象就发生的变化
                    System.out.println(Thread.currentThread().getName() + "抢到了第" + i-- + "张票");
                } else {
                    return;
                }
            }
        }
    }
    public static void main(String[] args) {
        TicketConsumer ticket = new TicketConsumer(new Integer(10));
        Thread t1 = new Thread(ticket, "张三");
        Thread t2 = new Thread(ticket, "李四");
        t1.start();
        t2.start();
    }
}