Java CountDownLatch demo

问题：

解决：

//CountDownLatchTest.java
//javac CountDownLatchTest.java && java CountDownLatchTest

import java.util.concurrent.*;

class CountDownLatchTest{
        public static void main(String[] argv){
                CountDownLatch latch = new CountDownLatch(2);
                Thread t1 = new Thread(()->{
                        try{
                                latch.await();
                                System.out.println("t1 ok ");
                        }catch(Exception e){}
                });     
                t1.start();
                Runnable r = ()->{
                        try{    
                                Thread.sleep(1000);
                                System.out.println("countDown ok");                                     
                                latch.countDown();
                        }catch(Exception e){}
                };
                Thread t2 = new Thread(r);
                t2.start();
                Thread t3 = new Thread(r);
                t3.start();

        }
}

//CountDownLatchTest.java

//javac CountDownLatchTest.java && java CountDownLatchTest

import java.util.concurrent.*;

class CountDownLatchTest{

public static void main(String[] argv){

CountDownLatch latch = new CountDownLatch(2);

Thread t1 = new Thread(()->{

try{

latch.await();

System.out.println("t1 ok ");

}catch(Exception e){}

});

t1.start();

Runnable r = ()->{

try{

Thread.sleep(1000);

System.out.println("countDown ok");

latch.countDown();

}catch(Exception e){}

};

Thread t2 = new Thread(r);

t2.start();

Thread t3 = new Thread(r);

t3.start();

}

参考：

IT问题

程序员的疑难杂症录

Java CountDownLatch demo

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