线程之中断

下面我们用一段代码进行模拟这个事故发生

描述：这里读线程ReadObjectThread在读到ID和name不一致时候就会进行输出这些对象，而ChangeObjectThread总是会写入两个相同的ID和NAME值，我们代码最后使用的stop方法

package com.base.zhou.thread.pack2;


/**
 * @author zhou.moumou
 * @version 2018年5月7日 下午9:27:33
 * @description
 */
public class Thread_Stop {
public static User user = new User();


public static class User {
private int id;
private String name;


public int getId() {
return id;
}


public void setId(int id) {
this.id = id;
}


public String getName() {
return name;
}


public void setName(String name) {
this.name = name;
}


public User() {
id = 0;
name = "0";
}


@Override
public String toString() {
return "User{" + "name='" + name + '\'' + ", id=" + id + '}';
}
}


public static class ChangeObjectThread extends Thread {
public void run() {
while (true) {
synchronized (user) {
int v = (int) (System.currentTimeMillis() / 1000);
user.setId(v);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
user.setName(v + "");
}
//让自己或者其他线程运行，并不是单纯的让给其他线程
Thread.yield();
}
}
}


public static class ReadObjectThread extends Thread {
public void run() {
while (true) {
synchronized (user) {
if (user.getId() != Integer.parseInt(user.getName())) {
System.out.println("不一致事故出现:"+user.toString());
}
}
Thread.yield();
}
}
}


public static void main(String args[]) throws InterruptedException {
new ReadObjectThread().start();
while (true) {
Thread thread = new ChangeObjectThread();
thread.start();
Thread.sleep(150);
thread.stop();
}
}

}

代码结果

分析一波；就是ChangeObjectThread 中当id设值之后，name没设值之前这个空档，如果调用stop方法，那么此ChangeObjectThread 对应的锁就会释放，那么读线程ReadObjectThread就可能读到最新的ID和上一次的旧NAME

解决方案1:在ChangeObjectThread 中增加新的stop方法newStop

解决方案二：使用Thread.interrupt