多线程的Wait返回它等待的下方

Java多线程生产消费者模型

最新推荐文章于 2025-11-23 13:27:25 发布

原创最新推荐文章于 2025-11-23 13:27:25 发布 · 172 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java #thread #wait

Java Thread 多线程专栏收录该内容

22 篇文章

订阅专栏

本文通过Java代码实现了一个简单的多线程生产消费者模型，详细展示了如何使用synchronized、wait、notify等关键字来实现线程间的同步和互斥操作。通过两个消费者线程和一个生产者线程的交互，演示了数据的生产和消费过程，以及线程间的等待与唤醒机制。

多线程的Wait返回它等待的下方。

 Java Code 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69

package org.vocano.java.tst;
class ThreadDemo {
    public static void main(String[] args) {
        Buffer buf = new Buffer();
        new Producer(buf).start();
        new Consumer(buf).start();
        new Consumer(buf).start();
    }
}
class Producer extends Thread {
    private Buffer buf;
    public Producer(Buffer buf) {
        this.buf = buf;
    }
    public void run() {
        boolean odd = false;
        while(true) {
            synchronized(buf) {
                System.out.println("Producer get lock!");
                if(buf.bFull) {
                    System.out.println("Producer wait!!!");
                    try{buf.wait();}catch(Exception e) {}
                    System.out.println("Producer wait return return return !!!!!!! ");
                }
                if(odd) {
                    buf.name="jack";
                    try{Thread.sleep(100);}catch(Exception e) {}
                    buf.sex="female";
                } else {
                    buf.name="lucy";
                    try{Thread.sleep(100);}catch(Exception e) {}
                    buf.sex="male";
                }
                buf.bFull = true;
                buf.notify();
                System.out.println("Producer release lock!");
            }
            odd = !odd;
        }
    }
}
class Consumer extends Thread {
    private Buffer buf;
    public Consumer(Buffer buf) {
        this.buf = buf;
    }
    public void run() {
        while(true) {
            synchronized(buf) {
                System.out.println("Consumer get lock!");
                if(!buf.bFull) {
                    System.out.println("Consumer wait!!!");
                    try{buf.wait();}catch(Exception e) {}
                    System.out.println("Consumer wait return return return !!!!!!! ");
                }
                try{Thread.sleep(500);}catch(Exception e) {}
                System.out.println(buf.name + " : " + buf.sex);
                buf.bFull = false;
                buf.notify();
                System.out.println("Consumer release lock!");
            }
        }
    }
}
class Buffer {
    boolean bFull = false;
    String name = "Unkown";
    String sex = "Unkown";
}

输出：可看出Wait的返回时另一个的wait或者release，不是自己getLock，说明notify放回wait的点。

 Java Code 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

Producer get lock!
Producer release lock!
Consumer get lock!
lucy : male
Consumer release lock!
Consumer get lock!
Consumer wait!!!
Producer get lock!
Producer release lock!
Producer get lock!
Producer wait!!!
Consumer wait return return return !!!!!!!
jack : female
Consumer release lock!
Producer wait return return return !!!!!!!
Producer release lock!
Producer get lock!
Producer wait!!!
Consumer get lock!