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How is a completablefuture used in Java 8?
A CompletableFuture is an extension to Java’s Future API which was introduced in Java 8. A Future is used for asynchronous Programming. It provides two methods, isDone () and get (). The methods retrieve the result of the computation when it completes.
Is there a callback method for completablefuture in Java?
There is also no provision for a callback method which can be called once the task completes. CompletableFuture class in Java which implements Future interface and CompletionStage interface tries to address these issues. This class provides methods like runAsync () and supplyAsync () that run a task asynchronously.
How to run a completablefuture asynchronously in Java?
If you want to run some background task asynchronously and don’t want to return anything from the task, then you can use CompletableFuture.runAsync () method. It takes a Runnable object and returns CompletableFuture . // Run a task specified by a Runnable Object asynchronously.
Can a future be mutually complete in Java?
A Future cannot be mutually complete. We cannot perform further action on a Future’s result without blocking. Future has not any exception handling. We cannot combine multiple futures. Future has so many limitations, that’s why we have CompletableFuture.
Is it possible to combine multiple futures in Java?
We cannot combine multiple futures. Future has so many limitations, that’s why we have CompletableFuture. CompletableFuture provides a broad set of methods for creating multiple Futures, chaining, and combining. It also has comprehensive exception handling support.
When to use callback function in Java completablefuture?
You don’t have the ability to attach a callback function to the Future and have it get called automatically when the Future’s result is available. Sometimes you need to execute a long-running computation and when the computation is done, you need to send its result to another long-running computation, and so on.