java多线程常用知识点, 安卓多线程面试要点

一，正确的中断线程的操作：有两种方法

• 1，interrupt()结合return操作
• 2，interrupt()结合抛异常操作

public class MyThread extends Thread {    @Override    public void run() {        super.run();        //1,interrupt()结合return操作        while (true) {            if (this.isInterrupted()) {                System.out.println("ֹ执行了ͣinterrupt冲断当前线程操作");                return;            }            System.out.println("当前时间=" + System.currentTimeMillis());        }        /*        //2,interrupt()结合抛异常操作        try {            while (true) {                if (this.isInterrupted()) {                    System.out.println("ֹ执行了ͣinterrupt冲断当前线程操作");                    throw new InterruptedException();                }                System.out.println("当前时间=" + System.currentTimeMillis());            }        } catch (InterruptedException e) {            e.printStackTrace();            System.out.println("捕获到了抛异常中断线程");        }*/    }}public static void main(String[] args) throws InterruptedException {        MyThread myThread=new MyThread();        myThread.start();        Thread.sleep(2000);        myThread.interrupt();    }

二，join的使用

public class Test {    public static void main(String[] args) throws InterruptedException {        MyThread threadTest = new MyThread();        threadTest.start();        threadTest.join();//主线程需要等threadTest（子线程）执行完以后再执行下面操作        System.out.println("我想当threadTest对象执行完毕后我再执行");    }    static public class MyThread extends Thread {        @Override        public void run() {            System.out.println("我想先执行");        }    }}

三，wait和notify结合使用

/** * A线程等待B线程来唤醒 */public class ThreadDemo {    public static void main(String[] args) throws InterruptedException {        Object lock = new Object();        ThreadA threadA = new ThreadA(lock);        threadA.start();        ThreadB threadB = new ThreadB(lock);        threadB.start();    }    public static class ThreadA extends Thread {        private Object lock;        public ThreadA(Object lock) {            this.lock = lock;        }        @Override        public void run() {            super.run();            synchronized (lock) {                System.out.println("A开始等待" + System.currentTimeMillis());                try {                    lock.wait();                } catch (InterruptedException e) {                    e.printStackTrace();                }                System.out.println("A等待结束" + System.currentTimeMillis());            }        }    }    public static class ThreadB extends Thread {        Object lock;        public ThreadB(Object lock) {            this.lock = lock;        }        @Override        public void run() {            super.run();            synchronized (lock) {                for (int i = 0; i < 10; i++) {                    MyList.add(i);                    if (MyList.size() == 5) {                        lock.notify();                        System.out.println("B发出唤醒");                    }                }            }        }    }}

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