本文共 1564 字，大约阅读时间需要 5 分钟。

public class TeatPrintOrder {		public static void main(String args[]){				AtomicInteger atomic = new AtomicInteger();				Print p = new Print();		ThreadTest a = new ThreadTest(p,"A",0,10,atomic);		ThreadTest b = new ThreadTest(p,"B",1,10,atomic);		ThreadTest c = new ThreadTest(p,"C",2,10,atomic);				a.start();b.start();c.start();	}		}class ThreadTest extends Thread{	String name="";	Integer id ;	Print tPrint = null;	int count;	AtomicInteger atomic ;	ThreadTest(Print p,String name,Integer id,int count,AtomicInteger atomic){		this.name = name ;		this.id= id ;		this.tPrint = p ;		this.count = count ;		this.atomic= atomic ;	}	public void run(){		while(count>0){			if((atomic.get() % 3) ==id){				tPrint.PrintName(name);				atomic.getAndAdd(1);				count--;			}		}	}}class Print{	void PrintName(String name){		System.out.print(name);	}}

1.设计上注意，把打印这个对象独立出来，以便控制资源的同步

2.使用atomic类原子性控制线程的执行，此处的取模，相当于一个变量标识

3.如果是打印一遍，使用线程的join()，比较便捷。

static class MyThread extends Thread {    public MyThread (final String name) {        super (name);    }    @Override    public void run () {        System.out.print (currentThread ().getName ());    }}private static void printOnceV2 () throws InterruptedException {    final MyThread threadA = new MyThread ("A");    final MyThread threadB = new MyThread ("B");    final MyThread threadC = new MyThread ("C");    threadA.start ();    threadA.join ();        // 等待 A 运行完，再开始 B    threadB.start ();    threadB.join ();        // 等待 B 运行完，再开始 C    threadC.start ();}