What are some examples of callable in Java?

What are some examples of callable in Java?

In Java, a Callable is similar to Runnable but can return a result and throw a checked exception. Here are a few examples.

Can you show me a simple example of using Callable?

Sure! Here's a simple example:

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class CallableExample {
    public static void main(String[] args) {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        Callable<String> task = () -> {
            Thread.sleep(1000);
            return "Task completed!";
        };
        Future<String> future = executor.submit(task);
        try {
            System.out.println(future.get());
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        } finally {
            executor.shutdown();
        }
    }
}

What happens if the Callable throws an exception?

If a Callable throws an exception, it will be wrapped in an ExecutionException when you call Future.get(). You can catch it to handle the error.