Creating Threads and Each Thread Displaying a Simple Message

class MyThreada extends Thread
{
 public void run()
 {
  while(true)
  {
   try
   {
    System.out.println("Good Morning");
    sleep(1000); 
   }
   catch (InterruptedException e)
   {
   }
  }
 }
}
class MyThreadb extends Thread
{
 public void run()
 {
  while(true)
  {
   try
   {
    System.out.println("Hello");
    sleep(2000);
   }
   catch (InterruptedException e)
   {
   }
  }
 }
}
class MyThreadc extends Thread
{
 public void run()
 {
  while(true)
  {
   try
   {
    System.out.println("Welcome");
    sleep(3000);
   }
   catch (InterruptedException e)
   {
   }
  }
 }
}
class MyThreadMain 
{
 public static void main(String[] args) 
 {
  MyThreada a=new MyThreada();
  MyThreadb b=new MyThreadb();
  MyThreadc c=new MyThreadc();
  a.start();
  b.start();
  c.start();
 }
}