Execute task in maximum amount of time

TimeoutExecutor.java

import java.util.Random;
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;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 *
 * @author DoDo <dopoljak@gmail.com>
 */
public class TimeoutExecutor
{
    public static Object execute(final long timeout, final TimeUnit unit, final Callable executable) throws InterruptedException, ExecutionException, TimeoutException
    {
        final long start_time = System.currentTimeMillis();
        final ExecutorService executor = Executors.newSingleThreadExecutor();

        try 
        {
            final Future<String> future = executor.submit(new Callable() 
            {
                @Override
                public Object call() throws Exception 
                {
                    return executable.call();
                }
            });

            return future.get(timeout, unit);
        }
        finally {
            executor.shutdownNow();
            System.out.println("Executed in : " + (System.currentTimeMillis() - start_time));
        }
    }
    
    public static void main(String[] args) 
    {
        try 
        {
            final long timeoutMilis = 25;
			
            final String response = (String) TimeoutExecutor.execute(timeoutMilis, TimeUnit.MILLISECONDS, new Callable() 
            {
                public Object call() throws Exception
                {
                    System.out.println("Starting operation ...");
                    
                    Thread.sleep(new Random().nextInt(50));
                    
                    System.out.println("Operation finished in time.");

                    return "Executed in time";
                }
            });
            
            System.out.println("Result : " + response);
        }
        catch (TimeoutException ex) 
        {
            System.out.println("TimeoutException occured ...");
        }
        catch (Exception ex) 
        {
            System.out.println("Exception ... ");
        }
           
    }
}