小编vik*_*mar的帖子

为什么在同一类锁上等待并通知函数不能正常工作？

请参阅以下检查代码,了解等待和通知功能及其输出.

输出:

Thread-1
Thread-2
Thread-2 after notify

预期结果:

Thread-1
Thread-2
Thread-2 after notify
Thread-1 after wait    

码:

public class WaitAndNotify1 {    
    public static void main(String[] args) {        
        Thread t1=new Thread(new Runnable(){            
            @Override
            public void run(){                
                System.out.println("Thread-1");                
                try {
                    synchronized (this) {
                        wait();
                        System.out.println("Thread-1 after wait");
                    }                    
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

        Thread t2=new Thread(new Runnable(){            
            @Override
            public void run(){
                try {
                    Thread.sleep(4000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Thread-2");
                synchronized (this) {
                    notify();
                    System.out.println("Thread-2 …