join() 线程方法 相当与插队,当前线程被阻塞,等被加入线程执行完才继续执行当前线程
package com.icss.biz.ppt;
public class JoinTest {
public static void main(String[] args) {
Sleeper sleeper = new Sleeper();
sleeper.start();
Joiner joiner = new Joiner(sleeper);
joiner.start();
}
}
class Sleeper extends Thread{
@Override
public void run() {
System.out.println("Sleeper线程ID="+Thread.currentThread().getId()+" start run");
try {
for(int i = 0 ; i < 50 ; i++) {
Thread.sleep(1000);
System.out.println("线程:"+Thread.currentThread().getId()+"----i="+i);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class Joiner extends Thread{
private Sleeper sleeper;
public Joiner (Sleeper sleeper) {this.sleeper = sleeper;}
@Override
public void run() {
try {
for(int i = 0 ; i < 50 ; i++) {
Thread.sleep(100);
System.out.println("线程"+Thread.currentThread().getId()+"--k="+i);
if(i==5) {
System.out.println("Sleeper 准备加入到当前线程"+Thread.currentThread().getId());
sleeper.join(); //sleeper加入当前线程,当前线程被阻塞,等待sleeper线程运行结束后这个线程才可以继续运行
}
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("线程ID"+Thread.currentThread().getId()+"--END");
}
}