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Program With Thread

Problem : Write a Thread program that execute concurrent execution.

Solution :
Blow programs has a default thread 'main' that creates two child thread 'Dhoni' and 'Yuvraj' .  All these three threads execute a loop that print thread name 500 times on the console.

Since all threads are executed concurrently, console output will be very interesting. Due to OS scheduling, output sequence of this program will never be same. Every time you execute program you will get different output sequence.

Program :

Step 1 - Coding

Create a text file c:\sunilos\HelloWithThread.java  and copy below contents.


 * A program with thread implementation

// A thread can be made by extending Thread class

public class HelloWithThread extends Thread {

        //instance variable contains Thread name
    String name = null;

        //Default constructor, initializes name
    public HelloWithThread(String threadName) {
        name = threadName;

        //Mandatory run method to perform thread operations
    public void run() {

        for (int i = 0; i < 500; i++) {
            System.out.println(i + " Hello Thread " + name);



Step 2 - Creating a test program to test above HelloWithThread class

Create a text file c:\sunilos\TestWithThread.java  and copy below contents.

 * A program to test HelloWithThread

public class TestWithThread {

         //This method is executed in a default 'Main' thread   
    public static void main(String[] args) {

                //Main thread created two child thread t1and t2
        HelloWithThread t1 = new HelloWithThread("Dhoni");

        HelloWithThread t2 = new HelloWithThread("Yuvraj");

                //start threads
                //main thread execute for loop 500 times. Ideally three 'for' loops will be executed from t1, t2 and main threads
        for (int i = 0; i < 500; i++) {
            System.out.println(i + " This is Main");


Step 3 - Deployment

  1. Create a folder 'c:\sunilos'. 
  2. Create or copy HelloWithThread.java and TestWithThread.java into 'c:\sunilos' folder.
  3. Open your command prompt and go to  'c:\sunilos'
  4. Compile HelloWithThread.java  and  TestWithThread.java with help of
    • javac HelloWithThread.java command
    • javac TestWithThread.java command.  Compiled class file will be created in  the same folder.
  5. Congratulations!! your Java program are ready to serve.

Step 4 - Testing

  1. Make sure you are on Command Prompt under c:\sunilos directory
  2. Now start your  java program from command prompt with help of 
    • java TestWithThread command.


0 Hello Thread Yuvraj
0 This is Main
0 Hello Thread Dhoni
1 Hello Thread Yuvraj
1 This is Main
1 Hello Thread Dhoni
2 Hello Thread Yuvraj
2 This is Main
2 Hello Thread Dhoni
3 This is Main
3 Hello Thread Yuvraj
3 Hello Thread Dhoni
4 Hello Thread Yuvraj
4 This is Main
5 Hello Thread Yuvraj
5 This is Main
4 Hello Thread Dhoni

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Namrata Sisodiya,
Aug 24, 2011, 1:44 AM
Namrata Sisodiya,
Aug 24, 2011, 1:46 AM