线程join

 

class ThreadB extends Thread

{

    private String ID="0";

    private int time=0;

    public ThreadB(String ID,int time)

    {

        this.ID=ID;

        this.time=time;

    }

    public void run()

    {

        System.out.println("线程A"+ID+"开始了");

        int i=1;

        try

        {

            while(i<=time)

            {

                System.out.println("线程A"+ID+"运行的 次数"+ i++);

                Thread.sleep(200);

            }

        } catch (Exception e)

        {

            // TODO: handle exception

            e.printStackTrace();

        }

        System.out.println("线程A"+ID+"结束");

    }

 

}

 

 

public class JoinThrea

{

    public static void main(String []args)

    {

        Thread thread1=new ThreadB("1",3);

        Thread thread2=new ThreadB("2",10);

        Thread thread3=new ThreadB("3",5);

        Thread thread4=new ThreadB("4",15);

        thread1.start();

 

        try

        {

            thread1.join();//只有当此线程结束 后面的线程才会开始

        } catch (Exception e)

        {

            // TODO: handle exception

        }

        thread2.start();

        thread3.start();

        thread4.start();

        try

        {

            thread1.join();

            thread2.join();

            thread3.join();

            thread4.join();

        } catch (InterruptedException  e)

        {

            // TODO: handle exception

            e.printStackTrace();

        }

 

        System.out.println("全部结束");//只有当以上所有线程结束后才会 运行

    }

}