What are some examples of using futures in Java?

What are some examples of using futures in Java?

In Java, futures are used for asynchronous programming. For example, you can use the CompletableFuture class to run tasks in parallel.

Can you show me a simple code example?

Sure! Here's a basic example:

import java.util.concurrent.CompletableFuture;

public class FutureExample {
    public static void main(String[] args) {
        CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
            return "Hello from the future!";
        });

        future.thenAccept(System.out::println);
    }
}

What happens if the task fails?

If the task fails, you can handle the exception using the handle or exceptionally methods. For example:

future.exceptionally(ex -> {
    System.out.println("Error: " + ex.getMessage());
    return null;
});