JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Thread By Implementing Runnable Interface

  • 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:
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...

Other Thread Examples

Knowledge Centre
Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces useful we must create subclasses. The final keyword makes a class unable to be extended.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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