Java Program on Priority of Thread

Program 1

package dataflair;

public class TestMain 
{
      public static void main(String[] args) 
      {
           System.out.println("This is Main Thread: ");    
           
           System.out.println("Main Thread Priority: "+ Thread.currentThread().getPriority());
              ChildThread1 mt1=new ChildThread1();
              ChildThread2 mt2=new ChildThread2();
           System.out.println("Child 1 Thread Priority: " + mt1.getPriority());               
           System.out.println("Child 2 Thread Priority: " + mt2.getPriority());               
            Thread.currentThread().setPriority(10);
            System.out.println("After Change Main Thread Priority: "+ Thread.currentThread().getPriority());
           System.out.println("After Change Child 1 Thread Priority: " + mt1.getPriority());               
           System.out.println("After Change Child 2 Thread Priority: " + mt2.getPriority());               
           
//           System.out.println("Minimum Priority value : "+Thread.MIN_PRIORITY);
//           System.out.println("Normal Priority value: "+Thread.NORM_PRIORITY);
//           System.out.println("Maximum Priority : "+Thread.MAX_PRIORITY);
//           
//              System.out.println("Main Thread Priority: "+ Thread.currentThread().getPriority());
//              ChildThread1 mt1=new ChildThread1();
//              ChildThread2 mt2=new ChildThread2();
//             // System.out.println("Child Thread Priority: " + mt1.getPriority());
//              mt1.setPriority(Thread.MAX_PRIORITY);
//              mt1.start();
//              mt2.setPriority(7);
//              mt2.start();
//              System.out.println("Child 1 Thread Priority: " + mt1.getPriority());
//              System.out.println("Child 2 Thread Priority: " + mt2.getPriority());
//              int i;
//            for(i=1;i<=10;i++)
//           {
//                System.out.println("Main Thread : ");
//            }
              
      }
    
}

Program 2

package dataflair;

public class ChildThread1 extends Thread
{
    public void run()
    {
       int i;
       for(i=1;i<=10;i++)
       {
           System.out.println("Child Thread 1: ");
       }
    }
}

Program 3

/*
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 */

package dataflair;

/**
 *
 * @author admin
 */
public class ChildThread2 extends Thread
{
    public void run()
    {
       int i;
       for(i=1;i<=10;i++)
       {
           System.out.println("Child Thread 2: ");
       }
    }
}