Thread Priorities in Java

In java, when two or more than  two thread is computing for CPU time, every thread is assigned a priority value. A highest Priority thread get preference over lower priority thread.  

All Java threads have a priority in the range 1-10.

Top priority is 10, lowest priority is 1.Normal priority ie. priority by default is 5.

Thread.MIN_PRIORITY –      1      minimum thread priority

Thread.MAX_PRIORITY –     10    maximum thread priority

Thread.NORM_PRIORITY –  5      maximum thread priority

Whenever a new Java thread is created it has the same priority as the thread which created it.

Thread priority can be changed by the setPriority() method.

Example: Write a program to demonstrate the thread priority.

class ThreadPriority extends Thread {
     public void run(){
         for(int i=1;i<=5;i++){
           try{
                System.out.println("Thread "+Thread.currentThread().getName()+
                      " priority "+Thread.currentThread().getPriority());
               Thread.sleep(1000);
              }catch(InterruptedException e){
                  System.out.println("InterruptedException "+e.getMessage());
               }
       }
     }
    
}
public class ThreadPriorityMain{
     public static void main(String s[]){
           ThreadPriority t1=new ThreadPriority();
           ThreadPriority t2=new ThreadPriority();
           ThreadPriority t3=new ThreadPriority();
           t1.setName("Thread 1");
           t2.setName("Thread 2");
           t3.setName("Thread 3");
           t2.setPriority(6);
           t3.setPriority(Thread.MAX_PRIORITY);
            t1.start();
            t2.start();
            t3.start ();              
}
}

Thread Thread 3 priority 10
Thread Thread 1 priority 5
Thread Thread 2 priority 6
Thread Thread 3 priority 10
Thread Thread 2 priority 6
Thread Thread 1 priority 5
Thread Thread 3 priority 10
Thread Thread 2 priority 6
Thread Thread 1 priority 5
Thread Thread 3 priority 10
Thread Thread 2 priority 6
Thread Thread 1 priority 5
Thread Thread 3 priority 10
Thread Thread 2 priority 6
Thread Thread 1 priority 5