简单wait(),notify()方法

1.两个类
public class Name{

    public static void main(String[] args) throws InterruptedException {
             User user=new User();
             Nice nice =new Nice(user);
             Ki ki =new Ki(user);
             new Thread(nice).start();
             new Thread(ki).start();
    }

}

class Nice extends Thread{
    Object object;
     public Nice(Object object){
         this.object=object;
     }

    @Override
    public void run() {
         synchronized (object){
             try {
                 System.out.println("aaaaaaaaaaaaa");
                 object.wait();
                 System.out.println("bbbbbbbbbbbbbbbb");
             } catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }
    }
}

class Ki extends Thread{

    Object object;

    public Ki(Object object){
        this.object=object;
    }

    @Override
    public void run() {
        synchronized (object) {
            object.notify();
        }
    }
}
2.一个类，两个方法

public class Name{

    public static void main(String[] args) throws InterruptedException {
             User user=new User();
             Nice nice =new Nice(user);
             nice.food();
             nice.good();
    }

}

class Nice{
    Object object;
     public Nice(Object object){
         this.object=object;
     }
    public void food(){
        Runnable runnable =new Runnable() {
            @Override
            public void run() {
                synchronized (object){
                    try {
                        System.out.println("aaaaaaaaaaaaaaa");
                        object.wait();
                        System.out.println("bbbbbbbbbbbbbbbbbbbb");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        };

        Thread thread =new Thread(runnable);
        thread.start();
    }

    public void good(){
        Runnable runnable2 =new Runnable() {
            @Override
            public void run() {
                synchronized (object){
                    object.notify();
                }
            }
        };
        Thread thread =new Thread(runnable2);
        thread.start();
    }

}

3.注意：
 wait(),notify()要和synchronized一起使用，要获取到锁