Join 与 CountDownLatch 之间的区别

import java.util.concurrent.CountDownLatch;public class CountDownLatchTest {    public static CountDownLatch c = new CountDownLatch(2);    public static void main(String[] args) throws InterruptedException {        Thread t = new Thread(new Runnable() {            @Override            public void run() {                System.out.println(1);                c.countDown();                System.out.println(2);                c.countDown();            }        });        t.start();        c.await();        System.out.println(3);    }}

点击查看结果

123

public class JoinCountDownLatchTest {    public static void main(String[] args) throws InterruptedException {                Thread parse1 = new Thread(new Runnable() {            @Override            public void run() {                System.out.println("parse1 finish!");            }        });                Thread parse2 = new Thread(new Runnable() {            @Override            public void run() {                System.out.println("parse2 finish!");            }        });                parse1.start();        parse2.start();        parse1.join();        parse2.join();        System.out.println("all parse finish!");    }}

点击查看结果

parse1 finish!parse2 finish!all parse finish!或者parse2 finish!parse1 finish!all parse finish!