如何使用fofkJoin获得多个结果，然后使用这些结果？

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

public class MyTask extends RecursiveTask<Integer> {
    private static final int THRESHOLD = 10;
    private int start;
    private int end;

    public MyTask(int start, int end) {
        this.start = start;
        this.end = end;
    }

    @Override
    protected Integer compute() {
        if (end - start <= THRESHOLD) {
            // 执行任务的逻辑，这里以计算从start到end的整数之和为例
            int sum = 0;
            for (int i = start; i <= end; i++) {
                sum += i;
            }
            return sum;
        } else {
            // 拆分任务为更小的子任务
            int middle = (start + end) / 2;
            MyTask leftTask = new MyTask(start, middle);
            MyTask rightTask = new MyTask(middle + 1, end);
            
            // 并行执行子任务
            leftTask.fork();
            rightTask.fork();
            
            // 获取子任务的结果
            int leftResult = leftTask.join();
            int rightResult = rightTask.join();
            
            // 合并子任务的结果
            return leftResult + rightResult;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        MyTask task = new MyTask(1, 100);
        Integer result = task.invoke();
        System.out.println("Result: " + result);
    }
}