What are some examples of concurrency in Java?

What are some examples of concurrency in Java?

Java provides several concurrency examples, such as using threads, the Executor framework, and the Fork/Join framework.

Can you explain how the Executor framework works?

The Executor framework simplifies thread management by providing a pool of threads to execute tasks asynchronously.

What is the difference between Callable and Runnable?

Runnable does not return a result and cannot throw checked exceptions, while Callable can return a result and throw exceptions.

Can you give me a code example using the Fork/Join framework?

Sure! Here's a simple example:

import java.util.concurrent.RecursiveTask;
import java.util.concurrent.ForkJoinPool;

public class ForkJoinExample extends RecursiveTask<Integer> {
    private final int n;

    public ForkJoinExample(int n) {
        this.n = n;
    }

    @Override
    protected Integer compute() {
        if (n <= 1) return n;
        ForkJoinExample f1 = new ForkJoinExample(n - 1);
        f1.fork();
        return n + f1.join();
    }
}

public class Main {
    public static void main(String[] args) {
        ForkJoinPool pool = new ForkJoinPool();
        int result = pool.invoke(new ForkJoinExample(10));
        System.out.println(result);
    }
}