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Java Thread By Implementing Runnable Interface

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October 11, 2017 by admin

  • A Thread can be created by extending Thread class also. But Java allows only one class to extend, it wont allow multiple inheritance. So it is always better to create a thread by implementing Runnable interface. Java allows you to impliment multiple interfaces at a time.
  • By implementing Runnable interface, you need to provide implementation for run() method.
  • To run this implementation class, create a Thread object, pass Runnable implementation class object to its constructor. Call start() method on thread class to start executing run() method.
  • Implementing Runnable interface does not create a Thread object, it only defines an entry point for threads in your object. It allows you to pass the object to the Thread(Runnable implementation) constructor.

Thread Sample Code

Code:
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package com.myjava.threads;
class MyRunnableThread implements Runnable{
    public static int myCount = 0;
    public MyRunnableThread(){
        
    }
    public void run() {
        while(MyRunnableThread.myCount <= 10){
            try{
                System.out.println("Expl Thread: "+(++MyRunnableThread.myCount));
                Thread.sleep(100);
            } catch (InterruptedException iex) {
                System.out.println("Exception in thread: "+iex.getMessage());
            }
        }
    }
}
public class RunMyThread {
    public static void main(String a[]){
        System.out.println("Starting Main Thread...");
        MyRunnableThread mrt = new MyRunnableThread();
        Thread t = new Thread(mrt);
        t.start();
        while(MyRunnableThread.myCount <= 10){
            try{
                System.out.println("Main Thread: "+(++MyRunnableThread.myCount));
                Thread.sleep(100);
            } catch (InterruptedException iex){
                System.out.println("Exception in main thread: "+iex.getMessage());
            }
        }
        System.out.println("End of Main Thread...");
    }
}

Example Output

Starting Main Thread...
Main Thread: 1
Expl Thread: 2
Main Thread: 3
Expl Thread: 4
Main Thread: 5
Expl Thread: 6
Main Thread: 7
Expl Thread: 8
Main Thread: 9
Expl Thread: 10
Main Thread: 11
End of Main Thread...

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