A simple java program that shows how to implement the Runnable interface

SimpleThread.java

class MyThread implements Runnable {
	Thread thrd;

	MyThread (String thrdName) {
		thrd = new Thread(this, thrdName);  //constructor
		thrd.start();						//starts the thread
	}

	//run() is the only method that you must override
	public void run() {
		System.out.println(thrd.getName() + " starting.");
		try {
			for(int i = 0; i < 10000; i++) {
				Thread.sleep(40);  //sets the thread to wait for 40 miliseconds
								   //throws InterruptedException
				System.out.println("In " + thrd.getName() + " count is " + i);
			}
		} catch(InterruptedException e) {
			System.out.println(thrd.getName() + " interrupted.");
		}

		System.out.println(thrd.getName() + " terminating.");
	}
}

class SimpleThread {
	public static void main(String args[]) {
		MyThread thrd1 = new MyThread("Thread#1");
		MyThread thrd2 = new MyThread("Thread#2");
		MyThread thrd3 = new MyThread("Thread#3");

		thrd1.thrd.setPriority(Thread.MAX_PRIORITY);	//sets the priority to 10
		thrd3.thrd.setPriority(Thread.MIN_PRIORITY);	//sets the priority to 1
		try{
			thrd1.thrd.join();	//joins the thread to the main thread
			thrd2.thrd.join();	//joins the thread to the main thread
			thrd3.thrd.join();	//joins the thread to the main thread
		} catch (InterruptedException e) {
			System.out.println(e);
		}
		System.out.println("Main thread ending.");
	}
}