QuickSort 永不停止

QuickSort never stops

我正在尝试实现快速排序算法,但是当我 运行 它永远不会停止,结果是 WhosebugException

(我知道像我一样用两个栈来重新排列数组,不是最高效的方式,但此时这不是那么重要了。)

 private static void quickSort(int[] a, int start, int end) {
        if (start >= end) {
            return;
        }

        int pivot = a[start];
        Stack<Integer> left = new Stack<Integer>();
        Stack<Integer> right = new Stack<Integer>();

        for (int i = start + 1; i <= end; i++) {
            if (a[i] < pivot) {
                left.push(a[i]);
            } else {
                right.push(a[i]);
            }
        }

        int arrayIndex = 0;
        int middle = 0;

        while (left.size() > 0) {
            a[arrayIndex++] = left.pop();
        }

        middle = arrayIndex;
        a[arrayIndex++] = pivot;

        while (right.size() > 0) {
            a[arrayIndex++] = right.pop();
        }

        quickSort(a, start, middle - 1);
        quickSort(a, middle + 1, end);
    }
 int arrayIndex = 0;

必须替换为

 int arrayIndex = start;