gistfile1.txt

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class CallableAndFuture
{
	public static void main(String[] args)
	{
		ExecutorService threadpool = Executors.newFixedThreadPool(1);
		System.out.println("main_1");
		Callable<String> callable = new Callable<String>()
		{
			public String call() throws Exception
			{
				System.out.println("call_start");
		        URL oracle = new URL("http://www.google.com/");
		        URLConnection yc = oracle.openConnection();
		        BufferedReader in = new BufferedReader(new InputStreamReader(
		                                yc.getInputStream()));
		        String inputLine;
		        while ((inputLine = in.readLine()) != null) ;
		        in.close();
				System.out.println("call_finish");
		        return inputLine;
			}
		};
		System.out.println("main_2");
		Future<String> future = threadpool.submit(callable);
		System.out.println("main_3");

		try
		{
			System.out.println("1");
			Thread.sleep(3000);
			System.out.println("2");
			System.out.println("isDone: "+future.isDone());
			System.out.println("get: "+future.get());
			System.out.println("3");
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}