java 并发库 Future 和 Collable的使用

package endual;

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 MainApp {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		ExecutorService threadPool = Executors.newSingleThreadExecutor() ;
		Future<String> fu = threadPool.submit(new Callable<String>() {
			public String call() throws Exception {
				// TODO Auto-generated method stub
				return "Hello" ;
			}
		}) ;
		String msg = null ;
		try {
			 msg = fu.get() ;
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ExecutionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(msg);
	}

}