Demonstrate thread priorities in Java

A thread can be created by implementing the Runnable interface and overriding the run() method. Then a Thread object can be created and the start() method called.

The thread priority can be provided to the thread by the JVM or the programmer. It determines when the processor is provided to the thread as well as other resources. The method setPriority() of class Thread can be used to set the priority of the thread.

A program that demonstrates thread priorities in Java is given as follows:

Example

 Live Demo

public class ThreadDemo extends Thread {
   public void run() {
      System.out.println("Running...");
   }
   public static void main(String[] args) {
      ThreadDemo thread1 = new ThreadDemo();
      ThreadDemo thread2 = new ThreadDemo();
      ThreadDemo thread3 = new ThreadDemo();
      ThreadDemo thread4 = new ThreadDemo();
      ThreadDemo thread5 = new ThreadDemo();
      System.out.println("Default thread priority of Thread 1: " + thread1.getPriority());
      System.out.println("Default thread priority of Thread 2: " + thread2.getPriority());
      System.out.println("Default thread priority of Thread 3: " + thread3.getPriority());
      System.out.println("Default thread priority of Thread 4: " + thread4.getPriority());
      System.out.println("Default thread priority of Thread 5: " + thread5.getPriority());
      thread1.setPriority(8);
      thread2.setPriority(1);
      thread3.setPriority(6);
      thread4.setPriority(9);
      thread5.setPriority(3);
      System.out.println("Modified thread priority of Thread 1: " + thread1.getPriority());
      System.out.println("Modified thread priority of Thread 2: " + thread2.getPriority());
      System.out.println("Modified thread priority of Thread 3: " + thread3.getPriority());
      System.out.println("Modified thread priority of Thread 4: " + thread4.getPriority());
      System.out.println("Modified thread priority of Thread 5: " + thread5.getPriority());
      System.out.print(Thread.currentThread().getName());
      System.out.println("\nDefault thread priority of Main Thread: " + Thread.currentThread().getPriority());
      Thread.currentThread().setPriority(10);
      System.out.println("Modified thread priority of Main Thread: " + Thread.currentThread().getPriority());
   }
}

Output

Default thread priority of Thread 1: 5
Default thread priority of Thread 2: 5
Default thread priority of Thread 3: 5
Default thread priority of Thread 4: 5
Default thread priority of Thread 5: 5
Modified thread priority of Thread 1: 8
Modified thread priority of Thread 2: 1
Modified thread priority of Thread 3: 6
Modified thread priority of Thread 4: 9
Modified thread priority of Thread 5: 3
main
Default thread priority of Main Thread: 5
Modified thread priority of Main Thread: 10

Rishi Raj

Updated on 30-Jul-2019 22:30:24

• Related Questions & Answers
• Demonstrate Static Import in Java
• Demonstrate Private access modifier in Java
• Demonstrate the clone() method in Java
• User Thread vs Daemon Thread in Java?
• Daemon thread in Java
• Thread Pools in Java
• Demonstrate constructors in a Multilevel Hierarchy in Java
• How a thread can interrupt another thread in Java?
• Create and demonstrate an immutable collection in Java
• Demonstrate getting the immediate superclass information in Java
• Demonstrate static variables, methods and blocks in Java
• Inter thread communication in Java
• Get current thread in Java
• Change Thread Priority in Java
• Thread Interference Error in Java