A procedure for creating a thread by implementing the Runnable interface

• Create a class that implements the Runnable interface.
• Implement the run method to perform the desired task.
• Create the thread by supplying an instance of the Runnable class to the Thread constructor.
• Call the start method of the thread object.

A version of the Count Down application that uses the Runnable interface

public class CountDownRunnableApp
{
    public static void main(String[] args)
    {
        Thread count1 = new Thread(new CountDownEven());
        Thread count2 = new Thread(new CountDownOdd());
        count1.start();                       // start the countdown threads
        count2.start();
    }
}

class CountDownEven implements Runnable       // this class counts even numbers
{
    public void run()
    {
        Thread t = Thread.currentThread();
        for (int i = 10; i > 0; i-= 2)
        {
            System.out.println(t.getName() + " Count " + i);
            Thread.yield();                   // allow the other thread to run
        }
    }
}

class CountDownOdd implements Runnable          // this class counts odd numbers
{
    public void run()
    {
        Thread t = Thread.currentThread();
        for (int i = 9; i > 0; i-= 2)
        {
            System.out.println(t.getName() + " Count " + i);
            Thread.yield();                     // allow the other thread to run
        }
    }
}