When you try to invoke the start method on the same thread twice the second thread will not start and result into exception.Also first thread will not stops its execution

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/*When

you try to invoke the start method on the same thread twice the second thread will not start and result

into exception.Also first thread will not stops its execution*/

package threading;

public class Self extends Thread{

      

       @Override

       public void run() {

             

              for (int i=0;i<5;i++)

              {

  System.out.println(i+" Thread name is "+Thread.currentThread().getName());

                     try {

                    

                           Thread.sleep(1000);

                    

                     } catch (InterruptedException e) {

                          

                           e.printStackTrace();

                     }

              }

       }

       public static void main(String[] args) {

             

Thread t = new Thread(new Self());

t.start();

t.start(); //exception will throw and second thread will not start

             

       }

}

/* Output:

 *

 * Exception in thread "main" 0 Thread name is Thread-1

java.lang.IllegalThreadStateException

       at java.lang.Thread.start(Unknown Source)

       at threading.Self.main(Self.java:28)

1 Thread name is Thread-1

2 Thread name is Thread-1

3 Thread name is Thread-1

4 Thread name is Thread-1

*/