java多线程快速入门（十九）

Posted 2021-01-22 cppdy

如何停止线程

　　1、使用stop方法强行终止线程（这个方法不推荐使用，可能会出现业务操作未执行完，线程中断了）

package com.cppdy;

class MyThread15 extends Thread{

    @Override
    public synchronized void run() {
        while(true) {
            try {
                wait();
            } catch (Exception e) {
                
            }
            //如果这里有非常重要的代码块，是不是就出现问题了
            System.out.println("Thread run------");
        }
    }
    
}

public class ThreadDemo15 {

    public static void main(String[] args) throws Exception {
        MyThread15 mt = new MyThread15();
        Thread thread1 = new Thread(mt);
        Thread thread2 = new Thread(mt);
        thread1.start();
        thread2.start();
        int count=0;
        while(true) {
            System.out.println("Main run------");
            Thread.sleep(100);
            if(count==30) {
                thread1.stop();
                thread2.stop();
                break;
            }
            count++;
        }
    }

}

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　　2、使用interrupt方法中断线程（将业务操作执行完后再中断线程）

package com.cppdy;

class MyThread15 extends Thread{

    @Override
    public synchronized void run() {
        while(true) {
            try {
                wait();
            } catch (Exception e) {
                
            }
            //如果这里有非常重要的代码块，是不是就出现问题了
            System.out.println("Thread run------");
        }
    }
    
}

public class ThreadDemo15 {

    public static void main(String[] args) throws Exception {
        MyThread15 mt = new MyThread15();
        Thread thread1 = new Thread(mt);
        Thread thread2 = new Thread(mt);
        thread1.start();
        thread2.start();
        int count=0;
        while(true) {
            System.out.println("Main run------");
            Thread.sleep(100);
            if(count==30) {
                thread1.interrupt();
                thread2.interrupt();
                break;
            }
            count++;
        }
    }

}

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　　3、使用退出标志，使线程正常退出，也就是当run方法完成后线程终止

package com.cppdy;

class MyThread15 extends Thread{

    public volatile boolean flag=true;
    
    @Override
    public synchronized void run() {
        while(flag) {
            try {
                
            } catch (Exception e) {
                setFlag(flag);
            }
            System.out.println("Thread run------");
        }
    }
    
    public void setFlag(boolean flag) {
        this.flag=flag;
    }
    
}

public class ThreadDemo15 {

    public static void main(String[] args) throws Exception {
        MyThread15 mt = new MyThread15();
        Thread thread1 = new Thread(mt);
        Thread thread2 = new Thread(mt);
        thread1.start();
        thread2.start();
        int count=0;
        while(true) {
            System.out.println("Main run------");
            Thread.sleep(100);
            if(count==30) {
                mt.setFlag(false);
                break;
            }
            count++;
        }
    }

}

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