聊聊Object类中的wait()和notify()方法

Object obj = new Object();
obj.wait();

Object obj = new Object();
obj.notify();

Object obj = new Object();
obj.notifyAll();

public class resourse {
    private Integer number = 0 ;
    
    public synchronized void  produce () throws Exception
    {
//        判断  这里用while 用if多与两个线程容易出错
//        不等于0就要等待消费者消费完
         if(number!=0)
         {
             this.wait();
         }
//         干活
        number++;
        System.out.println(Thread.currentThread().getName() + "的资源数为：" + number.toString());
//        释放
        this.notifyAll();
    }
//wait操作会释放锁
    public synchronized void consumer () throws Exception
    {
        //    等于零就要等待生产者生产
        if (number == 0)
        {
            this.wait();
        }
//        消费
        number--;
        System.out.println(Thread.currentThread().getName() + "的资源数为：" + number.toString());
//        释放
        this.notifyAll();
    }
}

public class main {
    public static void main (String[] args) {
        resourse resourse = new resourse();
            new Thread(()->{
                try{
                    for (int i=0 ; i<100;i++)
                    resourse.produce();
                }catch (Exception e)
                {
                    e.printStackTrace();
                }
            }).start();
        new Thread(()->{
            try{
                for (int i=0 ; i<100;i++)
                resourse.produce();
            }catch (Exception e)
            {
                e.printStackTrace();
            }
        }).start();
        new Thread(()->{
            try{
                for (int i=0 ; i<100;i++)
                    resourse.consumer();
            }catch (Exception e)
            {
                e.printStackTrace();
            }
        }).start();
        new Thread(()->{
            try{
                for (int i=0 ; i<100;i++)
                resourse.consumer();
            }catch (Exception e)
            {
                e.printStackTrace();
            }
        }).start();
    }
}