Question

Part A:

i. Create a java class that implements the Runnable interface and prints numbers from 1 to 100.

ii. Create a static main function (within the same or a separate class) in which you instantiate a new instance of the above class and call the run() method. Print “THE END” after the call to the run() method.

Note: this version do not use threading.

Part B:

iii. Revise the above main function such that instead of a direct call to the run() method, create a thread and execute in a separate thread. See the example in the above link.
Question: Do you see any changes in the output result?

Answer 1

Answer 1:

public class ThreadExample implements Runnable {

   @Override
   public void run() {
       for (int i = 1; i <= 100; i++)
           System.out.println(i);
   }

   public static void main(String[] args) {
       ThreadExample th = new ThreadExample();
       th.run();
       System.out.println("THE END");
   }
}

Answer 2:

public class ThreadExample implements Runnable {

   @Override
   public void run() {
       for (int i = 1; i <= 100; i++)
           System.out.println(i);
   }

   public static void main(String[] args) {
       ThreadExample th = new ThreadExample();
       Thread t = new Thread(th);
       t.start();
       System.out.println("THE END");
   }
}

In the first program we are not using the threading so the THE END is printed in the end because after executing the run() method it will execute remaining statements in the main()

In the second program we are using threading and main() ad threads will execute both parellely

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