How does the Runnable interface differ from the Callable interface in Java?

The Runnable interface in Java represents a task that can be executed in a separate thread but does not return a result and cannot throw checked exceptions. Its method:

void run();

The Callable<V> interface is similar, but it returns a result of type V and can throw exceptions:

V call() throws Exception;

Main differences:

• Runnable does not return a result, Callable does.
• Callable can throw checked exceptions.
• Callable is used with ExecutorService and returns a Future<V>, which allows obtaining the result asynchronously.

Example of using Callable:

Callable<Integer> task = () -> {
    // computations
    return 123;
};
ExecutorService executor = Executors.newSingleThreadExecutor();
Future<Integer> future = executor.submit(task);
Integer result = future.get();
executor.shutdown();