Fork Join Pool

 To use Fork join pool in Java, you need to follow these basic steps:


1. Create a task that implements the ForkJoinTask class or one of its subclasses, such as RecursiveTask or RecursiveAction. RecursiveTask is a subclass that returns a value, while RecursiveAction is a subclass that does not.


2. Create a ForkJoinPool instance by calling the ForkJoinPool.commonPool() method, or by creating your own instance using the ForkJoinPool constructor.


3. Submit the task to the pool by calling the invoke() method on the ForkJoinPool instance.


4. Wait for the task to complete by calling the join() method on the task.


Here is a simple example that illustrates how to use Fork join pool in Java:


```

import java.util.concurrent.ForkJoinPool;

import java.util.concurrent.RecursiveTask;


public class MyTask extends RecursiveTask<Integer> {

    private final int start;

    private final int end;


    public MyTask(int start, int end) {

        this.start = start;

        this.end = end;

    }


    @Override

    protected Integer compute() {

     //   int max=20*20;

        if (end - start <= 10) {

            int sum = 0;

            for (int i = start; i <= end; i++) {

                sum += i;

            }

            return sum;

        } else {

            int mid = (start + end) / 2;

            // left trees 0-5, 0-2, 0-1

            MyTask left = new MyTask(start, mid);

            //Right trees 6-10,8-10,9-10

            MyTask right = new MyTask(mid + 1, end);

            left.fork();

            right.fork();

            return left.join() + right.join();

        }

    }


    public static void main(String[] args) {

        ForkJoinPool pool = ForkJoinPool.commonPool();

        MyTask task = new MyTask(1, 100);

        int result = pool.invoke(task);

        System.out.println("Result: " + result);

    }

}

```


In this example, the MyTask class represents a simple calculation of the sum of integers between two given numbers. If the range of numbers is greater than 10, the task is split into two sub-tasks that are executed in parallel using the fork() and join() methods. The main method creates a ForkJoinPool instance and submits the task to it using the invoke() method. Finally, the result is printed to the console.

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