java多线程 基础demo

join()

 

让主进程等待子进程全部执行完

例子如下：

 

package mocker;

public class TestThread5 extends Thread {

     private String name;

     public TestThread5(String name) {

          super(name);

          this.name = name;

     }

     @Override

     public void run() {

          System.out.println(Thread.currentThread().getName() + "线程运行开始 ");

          for (int i = 0; i < 5; i++) {

              System.out.println("子线程" + name + "运行： " + i);

              try {

                   sleep((int) Math.random() * 10);

              } catch (InterruptedException e) {

                   e.printStackTrace();

              }

          }

          System.out.println(Thread.currentThread().getName() + "线程运行结束");

     }

     public static void main(String[] args) {

          System.out.println(Thread.currentThread().getName() + "主线程运行开始!");

          TestThread5 mTh1 = new TestThread5("A");

          TestThread5 mTh2 = new TestThread5("B");

          mTh1.start();

          mTh2.start();

          try{

              mTh1.join();

          }catch(InterruptedException e){

              e.printStackTrace();

          }

          try{

              mTh2.join();

          }catch(InterruptedException e){

              e.printStackTrace();

          }

          System.out.println(Thread.currentThread().getName() + "主线程运行结束!");

     }

}