使用Lock Condition交替打印ABC

最新推荐文章于 2024-03-08 20:20:37 发布

周莫客

最新推荐文章于 2024-03-08 20:20:37 发布

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分类专栏： JUC

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本文详细介绍了如何利用Lock的Condition特性，实现三个线程交替打印'A'、'B'和'C'，深入理解并发控制在多线程编程中的应用。

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使用Lock Condition交替打印ABC

package com.mock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class TestPrintABC {
    private int threadNum = 1;
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public static void main(String[] args) {
        TestPrintABC t = new TestPrintABC();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                t.printA();
            }
        }).start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                t.printB();
            }
        }).start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                t.printC();
            }
        }).start();
    }

    public void printA() {
        lock.lock();
        try {
            if (threadNum != 1) {
                try {
                    condition1.await();
                } catch (InterruptedException e) {
                }
            }
            System.out.println("A");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            threadNum = 2;
            condition2.signal();
        } finally {
            lock.unlock();
        }
    }

    public void printB() {
        lock.lock();
        try {
            if (threadNum != 2) {
                try {
                    condition2.await();
                } catch (InterruptedException e) {
                }
            }
            System.out.println("B");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            threadNum = 3;
            condition3.signal();
        } finally {
            lock.unlock();
        }
    }

    public void printC() {
        lock.lock();
        try {
            if (threadNum != 3) {
                try {
                    condition3.await();
                } catch (InterruptedException e) {
                }
            }
            System.out.println("C");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            threadNum = 1;
            condition1.signal();
        } finally {
            lock.unlock();
        }
    }
}