多线程编程 使线程具有有序性

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();    }}