sleep和wait的区别

/**
 * Sleep、WaitDemo
 *
 * @author suntao
 * @history 2020-02-11 14:30 suntao 新建
 * @since JDK1.8
 */
public class SleepWaitDemo {
    /**
     * sleep和wait的区别
     * 1、sleep是Thread的方法，wait是Object类中的防范
     * 2、sleep在任何地方都可以调用，wait只有在sychronized方法或sychronized块中进行使用；
     * 3、Thread.sleep只会让出cpu,不会导致对象锁的行为的改变；
     *    Object.wait不仅可以让出cpu,也会释放锁
     * @param args
     */
    public static void main(String[] args) {
        Object lock = new Object();

        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Thread A wait get lock.");
                synchronized (lock){
                    System.out.println("Thread A get lock.");
                    try {
                        Thread.sleep(20);  // 休眠20ms，模拟业务逻辑处理
                        System.out.println("Thread A do wait method.释放对象锁");
                        lock.wait(1000);     // 对象锁等待，释放对象锁
                        System.out.println("Thread A is done.");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        try {
            // 确保Thread A 先执行，占用对象锁，以验证lock.wait可以释放对象锁
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Thread B wait get lock.");
                synchronized (lock){
                    System.out.println("Thread B get lock.");
                    try {
                        Thread.sleep(10);  // 休眠10ms，模拟业务逻辑处理
                        System.out.println("Thread B is done.");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();

    }
}