让三个线程按序打印--join()实现

最新推荐文章于 2024-08-05 17:42:22 发布

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#java #jvm #android

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本文展示了一个使用Java实现的简单线程控制示例，通过三个线程按顺序打印first、second和third。该示例有助于理解线程间的同步与调度。

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package Pta;

import java.util.concurrent.Semaphore;

public class Test {
    public static void main(String[] args) throws InterruptedException {
        Foo foo = new Foo();
        Runnable printFirst = new Runnable() {
            @Override
            public void run() {
                System.out.println("first");
            }
        };
        Runnable printSecond = new Runnable() {
            @Override
            public void run() {
                System.out.println("second");
            }
        };
        Runnable printThird = new Runnable() {
            @Override
            public void run() {
                System.out.println("third");
            }
        };
        Thread t1=new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    foo.first(printFirst);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        Thread t2=new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    t1.join();
                    foo.second(printSecond);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        Thread t3=new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    t2.join();
                    foo.third(printThird);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        t3.start();
        t1.start();
        t2.start();
    }
}
class Foo {
    public Foo() {

    }
    public void first(Runnable printFirst) throws InterruptedException {

        printFirst.run();

    }
    public void second(Runnable printSecond) throws InterruptedException {

        printSecond.run();

    }
    public void third(Runnable printThird) throws InterruptedException {

        printThird.run();
    }
}