Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {
    public static void main(String[] args) {
        ForkJoinPool pool = new ForkJoinPool();
        IntSum task = new IntSum(3);
        long sum = pool.invoke(task);
        System.out.println("Sum is " + sum);
    }
}

class IntSum extends RecursiveTask<Long> {
    private int count;

    public IntSum(int count) {
        this.count = count;
    }

    @Override
    protected Long compute() {
        long result = 0;

        if (this.count <= 0) {
            return 0L;
        } else if (this.count == 1) {
            return (long) this.getRandomInteger();
        }
        List<RecursiveTask<Long>> forks = new ArrayList<>();
        for (int i = 0; i < this.count; i++) {
            IntSum subTask = new IntSum(1);
            subTask.fork(); // Launch the subtask
            forks.add(subTask);
        }
        // all subtasks finish and combine the result
        for (RecursiveTask<Long> subTask : forks) {
            result = result + subTask.join();
        }
        return result;
    }

    public int getRandomInteger() {
        return 2;
    }
}