Future

Table of Contents

What is a Future

Introduced in Java 5 (2004).

A java.util.concurrent.Future is a placeholder for a result of a computation task that hasn’t finished yet.

Once the task completes, the Future holds the result.

The following operations can be performed on a Future:

Table 1. Future operations

Method name	Description
`cancel`	Attempts to cancel execution of this task.
`get`	Waits if necessary for the computation to complete, and then retrieves its result, with or without a timeout parameter.
`isCancelled`	Check if the Future has been canceled, prior to normal completion.
`isDone`	Check if the Future completed normally.