What is the difference between Runnable and Callable in Java?

What is the difference between Runnable and Callable in Java?

Runnable and Callable are both interfaces in Java used for concurrent programming. Runnable does not return a result and cannot throw checked exceptions, while Callable can return a result and can throw checked exceptions.

Can you give me an example of how to use Callable?

Sure! Here's a simple example:

import java.util.concurrent.Callable;

public class MyCallable implements Callable<Integer> {
    @Override
    public Integer call() throws Exception {
        return 42;
    }
}

How about an example of Runnable?

Absolutely! Here's a basic example:

import java.lang.Runnable;

public class MyRunnable implements Runnable {
    @Override
    public void run() {
        System.out.println("Running in a thread!");
    }
}

When should I use Callable instead of Runnable?

You should use Callable when you need a task to return a result or when you need to handle checked exceptions. Runnable is suitable for tasks that do not require a return value.