Java并发编程系列-03-线程的终止

线程除了正常的结束外，还有哪些方式可以终止？

• 设置退出标识。
• 设置中断标识。

通过设置退出标识终止线程

/**
 * @description: 设置退出标识使线程终止
 * @author: Cyril
 * @create: 2019/11/18
 */
public class ThreadExitFlagDemo extends Thread {

    /**
     * 退出标识
     * volatile 内存可见性
     */
    public volatile boolean exit = false;

    @Override
    public void run() {
        while (!exit) {
        }
        System.out.println("线程ThreadExitFlagDemo退出！");
    }

    public static void main(String[] args) throws InterruptedException {
        ThreadExitFlagDemo threadExitFlagDemo = new ThreadExitFlagDemo();
        threadExitFlagDemo.start();
        //主线程休眠3秒钟
        sleep(3000);
        //设置退出标识
        threadExitFlagDemo.exit = true;
        //主线程让出资源，让threadExitFlagDemo线程继续执行，直到退出
        threadExitFlagDemo.join();
        System.out.println("主线程退出");
    }
}

通过设置中断标识终止线程

/**
 * @description: 通过interrupt()方法使线程终止
 * @author: Cyril
 * @create: 2019/11/19
 */
public class ThreadExitInterruptDemo extends Thread {
    /**
     * 退出标识
     */
    volatile boolean exit = false;

    @Override
    public void run() {
        while (!exit) {
            System.out.println(getName() + " is running");
            try {
                Thread.currentThread().join();
            } catch (InterruptedException e) {
                System.out.println("week up from block...");
                exit = true;
            }
        }
        System.out.println(getName() + " is exiting...");
    }

    public static void main(String[] args) throws InterruptedException {
        InterruptThread interruptThread = new InterruptThread();
        System.out.println("Starting thread...");
        interruptThread.start();
        Thread.sleep(3000);
        System.out.println("Interrupt thread...: " + interruptThread.getName());
//      设置退出标识为true，当线程阻塞时，使线程处于处于不可运行状态时，但该线程此时根本无法检查循环标志，当然也就无法立即中断
//      interruptThread.exit = true;
//      阻塞时退出阻塞状态
        interruptThread.interrupt();
//      主线程休眠3秒以便观察线程interruptThread的中断情况
        Thread.sleep(3000);
        System.out.println("Stopping application...");
    }
}

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