两个线程交替打印奇偶数

1. 拿到锁，我们就打印
2. 打印完，唤醒其他线程，自己就休眠

package threadcoreknowledge.threadobjectclasscommonmethods;


/**
 * 描述：     两个线程交替打印0~100的奇偶数，用wait和notify
 */
public class WaitNotifyPrintOddEveWait {

    private static int count = 0;
    private static final Object lock = new Object();


    public static void main(String[] args) {
        new Thread(new TurningRunner(), "偶数").start();
        new Thread(new TurningRunner(), "奇数").start();
    }

    //1. 拿到锁，我们就打印
    //2. 打印完，唤醒其他线程，自己就休眠
    static class TurningRunner implements Runnable {

        @Override
        public void run() {
            while (count <= 100) {
                synchronized (lock) {
                    //拿到锁就打印
                    System.out.println(Thread.currentThread().getName() + ":" + count++);
                    lock.notify();
                    if (count <= 100) {
                        try {
                            //如果任务还没结束，就让出当前的锁，并休眠
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }
}

新建2个线程
1个只处理偶数，第二个只处理奇数（用位运算）
用synchronized来通信

package threadcoreknowledge.threadobjectclasscommonmethods;

/**
 * 描述：     两个线程交替打印0~100的奇偶数，用synchronized关键字实现
 */
public class WaitNotifyPrintOddEvenSyn {

    private static int count;

    private static final Object lock = new Object();

    //新建2个线程
    //1个只处理偶数，第二个只处理奇数（用位运算）
    //用synchronized来通信
    public static void main(String[] args) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (count < 100) {
                    synchronized (lock) {
                        if ((count & 1) == 0) {
                            System.out.println(Thread.currentThread().getName() + ":" + count++);
                        }
                    }
                }
            }
        }, "偶数").start();

        new Thread(new Runnable() {
            @Override
            public void run() {
                while (count < 100) {
                    synchronized (lock) {
                        if ((count & 1) == 1) {
                            System.out.println(Thread.currentThread().getName() + ":" + count++);
                        }
                    }
                }
            }
        }, "奇数").start();
    }
}