Callable & Future

gistfile1.java

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class CallableAndFuture {

    /**
	 * @param args
	 */
	public static void main(String[] args) {
		ExecutorService threadPool = Executors.newSingleThreadExecutor();
		Future<String> future = threadPool.submit(new Callable<String>(){

			@Override
			public String call() throws Exception {
				Thread.sleep(3000);
				return "future";
			}
			
		});
		try {
			System.out.println("waiting...");
			System.out.println(future.get());
		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (ExecutionException e) {
			e.printStackTrace();
		}
	}

}