Java轮流打印字符

最新推荐文章于 2024-06-19 10:49:03 发布

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本文介绍了如何使用Java并发编程实现两个线程轮流打印字母A和B，以及通过原子整数和通知机制实现三个线程交替打印A、B、C。详细探讨了同步、等待、唤醒等并发概念的应用。

两个线程轮流打印A、B

public class ThreadDemo {

    public static void main(String[] args) {
        Thread t1 = new TT("A");
        Thread t2 = new TT("B");
        t1.start();
        t2.start();
    }

}

class TT extends Thread {
    private static Object LOCK = new Object();
    private String mName;
    private boolean flag;

    public TT() {
    }

    public TT(String name) {
        this.mName = name;
    }

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            synchronized (LOCK) {
                System.out.println(mName);
                flag = !flag;
                LOCK.notify();
                if (i < 10) {
                    try {
                        LOCK.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }// end of synchronized
        }// end for
    }// end run
}

三个线程轮流打印 A、B、C

import java.util.concurrent.atomic.AtomicInteger;

public class TestAsynTreadXunlei {
    public static void main(String argv[]) {

        AtomicInteger synObj = new AtomicInteger(0);

        TestPrint a = new TestPrint(synObj, "A", 0);
        TestPrint b = new TestPrint(synObj, "B", 1);
        TestPrint c = new TestPrint(synObj, "C", 2);

        a.start();
        b.start();
        c.start();
    }
}

class TestPrint extends Thread {

    private AtomicInteger synObj;
    private String name;
    private int flag;

    private int count = 0;

    public TestPrint(AtomicInteger synObj, String name, int flag) {
        this.synObj = synObj;
        this.name = name;
        this.flag = flag;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (synObj) {
                if (synObj.get() % 3 == flag) {
                    synObj.set(synObj.get() + 1);
                    System.out.println(name);
                    count++;
                    synObj.notifyAll();
                    if (count == 10) {
                        break;
                    }
                } else {
                    try {
                        synObj.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}