在编写多线程代码时，如果主线程结束，那么子线程也会随之结束，如何等待线程结束再往下执行。

 

等待线程执行完成代码。

 

线程代码：

 

package demo;

import java.util.concurrent.CountDownLatch;

public class NodeSqlThread1 implements Runnable{

   

    private CountDownLatch cdlSync;

   

    public NodeSqlThread1(CountDownLatch cdlSync){

        this.cdlSync=cdlSync;

    }

   

    @Override

    public void run() {

        for(int i=0;i<100;i++){

            try {

                Thread.sleep(50);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

        cdlSync.countDown();

    }

   

   

}

 

package demo;

import java.util.concurrent.CountDownLatch;

import com.hotent.BaseTestCase;

public class NodeSqlTest1 extends BaseTestCase {

    static CountDownLatch cdlSync=new CountDownLatch(10);

   

    @org.junit.Test

    public void test() throws InterruptedException{

        NodeSqlThread1 t =new NodeSqlThread1(cdlSync);

        for(int i =0;i< 10;i++){

            new Thread(t).start();

        }

        cdlSync.await();

        System.out.println(cdlSync.getCount()+"完成");

    }

}

最重要的是  cdlSync.await(); 它会等待所有线程结束后继续往下执行。