threadjoin

class thread implements Runnable
{Thread t;
    String name;
    thread(String tname)
    {
        name =tname;
        t=new Thread(this,name);
        t.start();
        System.out.println("thread "+name+": "+t);

    }
    public void run(){
        try{
        for(int i=5;i>0;i--)
        {
        System.out.println("thread "+name+": "+i);
        Thread.sleep(1000);
        }
        }catch(InterruptedException e)
        {
            System.out.println("error ");
        }
    }
}
public class join {
public static void main(String argv[])
{
    thread ob1=new thread("one");
    thread ob2=new thread("two");
    thread ob3=new thread("three");
  System.out.println("thread "+ob1.t +" is "+ob1.t.isAlive());
  System.out.println("thread "+ob2.t +" is "+ob2.t.isAlive());
  System.out.println("thread "+ob3.t +" is "+ob3.t.isAlive());
    try{
        System.out.println("waiting for thread to finish");
        ob1.t.join();
        ob2.t.join();
        ob3.t.join();
            }catch(InterruptedException e)
            {
                System.out.println("error in main");
            }
             System.out.println("thread "+ob1.t +" is "+ob1.t.isAlive());
              System.out.println("thread "+ob2.t +" is "+ob2.t.isAlive());
              System.out.println("thread "+ob3.t +" is "+ob3.t.isAlive());

}
}