Java多线程编程7--实例--顺序打印3次ABC

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正常的情况下，线程在运行时多个线程之间执行任务的时机是无序的。可以通过改造代码的方式使它们运行具有有序性。

public class MyThread extends Thread {    private Object lock;    private String showChar;    private int showNumPosition;    private int printCount = 0; //统计打印了几个字母    private volatile static int addNumber = 1;    public MyThread(Object lock, String showChar, int showNumPosition) {        super();        this.lock = lock;        this.showChar = showChar;        this.showNumPosition = showNumPosition;    }    @Override    public void run() {        try {            synchronized (lock) {                while (true) {                    if (addNumber % 3 == showNumPosition) {                        System.out.println("ThreadName="                                + Thread.currentThread().getName()                                + ",runCount=" + addNumber + " " + showChar);                        lock.notifyAll();                        addNumber++;                        printCount++;                        if (printCount == 3) {                            break;                        }                    } else {                        lock.wait();                    }                }            }        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

public class Run {    public static void main(String[] args) throws InterruptedException {        Object lock = new Object();        MyThread a = new MyThread(lock, "AA", 1);        MyThread b = new MyThread(lock, "BB", 2);        MyThread c = new MyThread(lock, "CC", 0);        a.start();        b.start();        c.start();    }}

ThreadName=Thread-0,runCount=1 AA
ThreadName=Thread-1,runCount=2 BB
ThreadName=Thread-2,runCount=3 CC
ThreadName=Thread-0,runCount=4 AA
ThreadName=Thread-1,runCount=5 BB
ThreadName=Thread-2,runCount=6 CC
ThreadName=Thread-0,runCount=7 AA
ThreadName=Thread-1,runCount=8 BB
ThreadName=Thread-2,runCount=9 CC

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