About Pankaj Kumar
Sometime back I wrote a post about Java Callable Future interfaces that we can use to get the concurrent processing benefits of threads as well as they are capable of returning value to the calling program.
FutureTask is base concrete implementation of Future interface and provides asynchronous processing. It contains the methods to start and cancel a task and also methods that can return the state of the FutureTask as whether it’s completed or cancelled. We need a callable object to create a future task and then we can use Java Thread Pool Executor to process these asynchronously.
Let’s see the example of FutureTask with a simple program.
Since FutureTask requires a callable object, we will create a simple Callable implementation.
package com.journaldev.threads;import java.util.concurrent.Callable;public class MyCallable implements Callable<String> { private long waitTime; public MyCallable(int timeInMillis){ this.waitTime=timeInMillis; } @Override public String call() throws Exception { Thread.sleep(waitTime); //return the thread name executing this callable task return Thread.currentThread().getName(); }} Source : http://www.javacodegeeks.com/2013/07/java-futuretask-example-program.html
