Processing results for Runnable objects in the Executor framework

The Executor framework allows the execution of concurrent tasks that returns a result using the Callable and Future interfaces. The traditional concurrent programming in Java is based on Runnable objects, but this kind of object doesn't return a result.

In this recipe, you will learn how to adapt a Runnable object to simulate a Callable one, allowing a concurrent task to return a result.

Getting ready

The example of this recipe has been implemented using the Eclipse IDE. If you use Eclipse, or another IDE such as NetBeans, open it and create a new Java project.

How to do it...

Perform the following steps to implement the example:

1. Create a class named FileSearch and specify that it implements the Runnable interface. This class implements the file search operation:

        public class FileSearch implements Runnable { 

2. Declare two private String attributes: one named initPath, which will store the initial folder for the search operation...