Java Programing laungage

/*
 /*
 * save as threddemo.java
 *Shows imlementation of Thread usin gThread class
 */
package multithradingexample1;
class thread_imp extends Thread{
    private String name;
thread_imp(String name)
{
    super("Demo Thread");
    this.name=name;
    start();
}
public void run()
{
    for(int i=0;i<6;i++)
    {
        try{
        System.out.println(name);
        Thread.sleep(1000);
        }
        catch(InterruptedException e)
        {
            System.out.print(e.toString());
        }
        }
    }
}
public class thraddemo {
    public static void main(String[] Str)
    {
      thread_imp th1 = new thread_imp("Thread1");
      thread_imp th2 = new thread_imp("Thread2");
           }
}