Thread中join用法

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1.背景

Java支持多线程，CPU分配给线程的时间片是随机的，有时需要控制线程的执行顺序，如执行完threadA再去执行threadB

2.用法

public class SyncTest {public static void main(String[] args){Thread threadA = new demoThread("threadA");Thread threadB = new demoThread("threadB");threadA.start();try {threadA.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}threadB.start();}}class demoThread extends Thread{String name;public demoThread(String name){this.name = name;}@Overridepublic void run() {// TODO Auto-generated method stub//super.run()int i;for (i =0;i<10;i++){System.out.println(name+"is running~~");}}}

注释threadA.join()

threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadBis running~~threadAis running~~threadAis running~~threadAis running~~threadBis running~~threadBis running~~threadBis running~~

加上threadA.join()

threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadAis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~threadBis running~~