Runnable 객체는 Thread 생성자에게 넘겨준다. The Runnable object is passed to the Thread constructor API 참조 http://docs.oracle.com/javase/tutorial/essential/concurrency/runthread.html

HelloRunnable.java

package docs.oracle.com.Thread;

public class HelloRunnable implements Runnable {

    @Override
	public void run() {
		// TODO Auto-generated method stub
		System.out.println("Hello from a thread!");
	}
	/**
	 * @param args
	 */
	public static void main(String[] args)  {
		// TODO Auto-generated method stub
		(new Thread(new HelloRunnable())).start();
	}

}