Java实现两个线程交替打印奇偶数

逃离我推掉我的手 2023-03-12 09:13 38阅读 0赞

使用两个线程分别交替打印奇偶数。

实现思路，通过一个对象锁同步请求，获取锁之后判断当前数字时候为奇数或者偶数，然后使用Object.wait方法释放锁并等待。

public class Main {
    
        public static void main(String[] args) {
    
            Main main = new Main();
            main.test();
        }
    
        private volatile int count = 0;
        public class Thread1 extends Thread {
            private final Object obj;
            public Thread1(Object obj) {
                this.obj = obj;
            }
    
            @Override
            public void run() {
                while (true) {
                    synchronized (obj) {
                        if (count % 2 == 1) {
                            System.out.println("thread1: " + count);
                            count++;
                        }
                        try {
                            obj.notifyAll();
                            obj.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        if (count > 1000) {
                            return;
                        }
                    }
                }
            }
        }
    
        public class Thread2 extends Thread {
            private final Object obj;
            public Thread2(Object obj) {
                this.obj = obj;
            }
    
            @Override
            public void run() {
                while (true) {
                    synchronized (obj) {
                        if (count % 2 == 0) {
                            System.out.println("thread2: " + count);
                            count++;
                        }
                        try {
                            obj.notifyAll();
                            obj.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
    
                        if (count > 1000) {
                            return;
                        }
                    }
                }
            }
        }
    
        public void test() {
            Object obj = new Object();
            Thread t1 = new Thread1(obj);
            Thread t2 = new Thread2(obj);
    
            t1.start();
            t2.start();
        }
    }

输出结果

![20200514180140578.png][]

[20200514180140578.png]: /images/20230312/202045f77d444abd999eccbf493fec51.png