Java中wait()和sleep()的区别_java中wait()与sleep ()的区别-优快云博客

本文链接：https://blog.youkuaiyun.com/ChenWei673727/article/details/89482432

本文详细解析了Java中线程的wait()与sleep()方法的区别，包括基本使用场景和本质差异。通过实例演示了wait()如何释放对象锁，而sleep()仅释放CPU资源而不释放锁。

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基本区别：
1.wait()是Object类中定义的方法，sleep()是Thread类中定义的方法
2.sleep()方法在任何地方都可以用到，wait()只能在synchronized方法中或者synchronized代码块中使用，是因为它要释放锁，而要释放锁的前提必须先获取到锁。

本质区别：
thread.sleep()会释放CPU，但是不会释放对象锁
object.wait()会释放CPU，同时也会释放对象锁

public class Test {
    public static void main(String[] args) {
        final Object lock = new Object();
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("thread A  is waiting to get lock");
                synchronized (lock){
                    System.out.println("thread A get lock ");
                    try {
                        Thread.sleep(20);
                        System.out.println("Thread A  do wait method");
                        lock.wait(1000);
                        System.out.println("Thread A is done");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("thread B  is waiting to get lock");
                synchronized (lock){
                    System.out.println("thread B get lock ");
                    try {
                        Thread.sleep(10);
                        System.out.println("Thread B  do wait method");
                        System.out.println("Thread B is done");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
}

输出的结果是：
thread A  is waiting to get lock
thread A get lock 
thread B  is waiting to get lock
Thread A  do wait method
thread B get lock 
Thread B  do wait method
Thread B is done
Thread A is done