SingleThreadDemo.java

public class SingleThreadDemo {
  public static void infiniteLoop() {
		while (true) {
		}
	}

	public static void main(String[] args) throws InterruptedException {
		Thread t = new Thread() {
			@Override
			public void run() {
				System.out.println("started");
				infiniteLoop();
			}
		};
		t.start();
		t.join(1000);
		System.out.println("after join");
		t.stop();
	}
}

ThreadPoolDemo.java

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class ThreadPoolDemo {
  public static void infiniteLoop() {
		while (true) {
			Thread.yield();
		}
	}

	public static void main(String[] args) throws Exception {
		ExecutorService executor = Executors.newFixedThreadPool(2);
		Callable<String> task = new Callable<String>() {
			public String call() throws Exception {
				System.out.println("starting task");
				infiniteLoop();
				System.out.println("ending task");
				return "Ready!";
			}
		};
		Future<String> future = null;
		for (int i = 0; i < 4; i++) {
			future = executor.submit(task);
		}

		try {
			System.out.println("Started..");
			System.out.println(future.get(1, TimeUnit.SECONDS));
			System.out.println("Finished!");
		} catch (TimeoutException e) {
			System.out.println("Timeout!");
		}

		executor.shutdownNow();
	}
}