项目结构

一直跑的线程

package com.xiaoa.thread;

public class Mythread implements Runnable {
    int tickets = 100;//線程共享的成員變量

    @Override
    public void run() {
        while (true) {
            if (tickets > 0) {
                System.out.println(Thread.currentThread().getName()+"卖出的第" + tickets-- + "张票");
            }
        }
    }

测试1，一切看似正常

package com.xiaoa.test;

import com.xiaoa.thread.Mythread;

public class ThreadTest {
    public static void main(String[] args) {
        Mythread tt = new Mythread();
        Thread t1 = new Thread(tt);//構造的線程必須傳入相同的runable,才可以共享成員變量
        Thread t2 = new Thread(tt);
        t1.setName("售票窗口1");
        t2.setName("售票窗口2");
        t1.start();
        t2.start();
    }
}

小睡一会的线程

package com.xiaoa.thread;

public class Mythread2 implements Runnable {
    int tickets = 100;//線程共享的成員變量

    @Override
    public void run() {
        while (true) {
            try {
                Thread.currentThread().sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if (tickets > 0) {
                System.out.println(Thread.currentThread().getName()+"卖出的第" + tickets-- + "张票");
            }
        }
    }

}

测试2，发现了线程不安全的诡异问题

package com.xiaoa.test;

import com.xiaoa.thread.Mythread2;

public class ThreadTest2 {
    public static void main(String[] args) {
        Mythread2 tt = new Mythread2();
        Thread t1 = new Thread(tt);//構造的線程必須傳入相同的runable,才可以共享成員變量
        Thread t2 = new Thread(tt);
        t1.setName("售票窗口1");
        t2.setName("售票窗口2");
        t1.start();
        t2.start();
    }
}

[此贴子已经被作者于2018-8-23 14:58编辑过]