MyRunnable.java

class MyRunnable implements Runnable {
	public void run() {
		System.out.println("Important job running in MyRunnable");
	}
}

MyThread.java

public class MyThread {

	public void run() {
		System.out.println("Important job running in MyThread");
	}

	// you're free to overload the run()method in your Thread subclass
	
	// The overloaded run(String s) method will be ignored by the Thread class
	// unless you call it yourself. The Thread class expects a run() method with
	// no arguments, and it will execute this method for you in a separate call
	// stack after the thread has been started
	public void run(String s) {
		System.out.println("String in run is " + s);
	}
}

Test.java

public class Test {
	public static void main(String[] args) {
		System.out.println("testing threads");
	}
}

TestThreads.java

public class TestThreads {
	public static void main(String[] args) {
		MyRunnable r = new MyRunnable();
		Thread foo = new Thread(r);
		Thread bar = new Thread(r);
		Thread bat = new Thread(r);
	}
}