Question

3. Write a Java program to demonstrate the concept of priority thread. It should show that each thread have a priority. Priorities are represented by a number between 1 and 20. In most cases, thread schedular schedules the threads according to their priority (known as preemptive scheduling). But it is not guaranteed because it depends on JVM specification that which scheduling it chooses.

3 constants defined in Thread class:
1. public static int MIN_PRIORITY
2. public static int NORM_PRIORITY
3. public static int MAX_PRIORITY

Default priority of a thread is 5 (NORM_PRIORITY). The value of MIN_PRIORITY is 1 and
the value of MAX_PRIORITY is 20.

Here is an example of priority of a Thread:
1. class TestMultiPriority1 extends Thread{
2. public void run(){
3.    System.out.println("running thread name is:"+Thread.currentThread().getName());
4.    System.out.println("running thread priority is:"+Thread.currentThread().getPriority());
5.   }

6. public static void main(String args[]){
7.   TestMultiPriority1 m1=new TestMultiPriority1();
8.   TestMultiPriority1 m2=new TestMultiPriority1();
9.   m1.setPriority(Thread.MIN_PRIORITY);
10.   m2.setPriority(Thread.MAX_PRIORITY);
11.   m1.start();
12.   m2.start();
13.  
14. }
15. }

Answer 1

public class TestMultiPriority1 extends Thread {
   public void run() {
       // printing the name and Priority of current running thread
       System.out.println(
               "Name : " + Thread.currentThread().getName() + " : Priority : " + Thread.currentThread().getPriority());
   }

   public static void main(String args[]) {
       TestMultiPriority1 m1 = new TestMultiPriority1();
       TestMultiPriority1 m2 = new TestMultiPriority1();
       m1.setPriority(Thread.MIN_PRIORITY);
       m2.setPriority(Thread.MAX_PRIORITY);
       m1.start();
       m2.start();

   }
}

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