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两个线程交替打印,对同一个值相加交替输出

松鼠树屋 2022-01-20 阅读 75
package com.company;


import java.util.*;

public class Main {


    static class Test{
        int n=0;
        boolean flag = false;
        public synchronized void firstA(){
            while (flag){
                try {
                    this.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            flag = true;
            n = n+1;
            System.out.println(Thread.currentThread()+"---"+n);
            this.notify();
        }
        public synchronized void firstB(){
            while (!flag){
                try {
                    this.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            flag = false;
            n = n+2;
            System.out.println(Thread.currentThread()+"---"+n);
            this.notify();
        }
    }

    public static void main(String[] args) {
        Test test = new Test();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i=0;i<10;i++)
                    test.firstA();
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i=0;i<10;i++)
                    test.firstB();
            }
        }).start();


    }
}

打印结果如下: 

Thread[Thread-0,5,main]---1
Thread[Thread-1,5,main]---3
Thread[Thread-0,5,main]---4
Thread[Thread-1,5,main]---6
Thread[Thread-0,5,main]---7
Thread[Thread-1,5,main]---9
Thread[Thread-0,5,main]---10
Thread[Thread-1,5,main]---12
Thread[Thread-0,5,main]---13
Thread[Thread-1,5,main]---15
Thread[Thread-0,5,main]---16
Thread[Thread-1,5,main]---18
Thread[Thread-0,5,main]---19
Thread[Thread-1,5,main]---21
Thread[Thread-0,5,main]---22
Thread[Thread-1,5,main]---24
Thread[Thread-0,5,main]---25
Thread[Thread-1,5,main]---27
Thread[Thread-0,5,main]---28
Thread[Thread-1,5,main]---30
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