private static final Integer MAX = 200;
    static class MyForkJoinTask extends RecursiveTask<Integer> {
        // 子任務開始計算的值
        private Integer startValue;
        // 子任務結(jié)束計算的值
        private Integer endValue;
        public MyForkJoinTask(Integer startValue , Integer endValue) {
            this.startValue = startValue;
            this.endValue = endValue;
        }
        @Override
        protected Integer compute() {
            // 如果條件成立，說明這個任務所需要計算的數(shù)值分為足夠小了
            // 可以正式進行累加計算了
            if(endValue - startValue < MAX) {
                System.out.println("開始計算的部分：startValue = " + startValue + ";endValue = " + endValue);
                Integer totalValue = 0;
                for(int index = this.startValue ; index <= this.endValue  ; index++) {
                    totalValue += index;
                }
                return totalValue;
            }
            // 否則再進行任務拆分，拆分成兩個任務
            else {
                MyForkJoinTask subTask1 = new MyForkJoinTask(startValue, (startValue + endValue) / 2);
                subTask1.fork();
                MyForkJoinTask subTask2 = new MyForkJoinTask((startValue + endValue) / 2 + 1 , endValue);
                subTask2.fork();
                return subTask1.join() + subTask2.join();
            }
        }
    }
    public static void main(String[] args) {
        // 這是Fork/Join框架的線程池
        ForkJoinPool pool = new ForkJoinPool();
        ForkJoinTask<Integer> taskFuture =  pool.submit(new MyForkJoinTask(1,1001));
        try {
            Integer result = taskFuture.get();
            System.out.println("result = " + result);
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace(System.out);
        }
    }