多线程编程使线程具有有序性_有序线程执行-优快云博客

本文介绍了一个使用Java实现的多线程程序案例，通过四个线程按指定顺序轮流打印字符“A”、“B”、“C”和“D”。程序利用synchronized关键字和wait/notifyAll方法确保线程间的正确同步，最终实现精确的打印顺序。

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package com.multithreading.pc73;

/**
 * Created by nanzhou on 2017/6/30.
 */
public class MyThread extends Thread {

    private Object lock;

    private String showCar;

    private int showNumPosition;

    private int printCount;

    volatile private static int addNumber = 1;

    public MyThread(Object lock, String showCar, int showNumPosition) {
        super();
        this.lock = lock;
        this.showCar = showCar;
        this.showNumPosition = showNumPosition;
    }

    @Override
    public void run() {

        try {
            synchronized (lock) {

                while (true) {

                    if (addNumber % 4 == showNumPosition) {

                        System.out.println("ThreadName " + Thread.currentThread().getName() + " runCount " + addNumber + " " + showCar);
                        lock.notifyAll();
                        addNumber++;
                        printCount++;
                        if (printCount == 10) {
                            break;
                        }
                    } else {
                        lock.wait();
                    }
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
package com.multithreading.pc73;

/**
 * Created by nanzhou on 2017/6/30.
 */
public class Run {

    public static void main(String[] args) {

        Object lock = new Object();

        MyThread a = new MyThread(lock, "A", 1);
        MyThread b = new MyThread(lock, "B", 2);
        MyThread c = new MyThread(lock, "C", 3);
        MyThread d = new MyThread(lock, "D", 0);

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

    }
}