递归实现的快速排序 java代码

下面是递归实现的快速排序的Java代码：

public static void quickSort(int[] arr, int left, int right) {
    if (left < right) {
        int pivotIndex = partition(arr, left, right);
        quickSort(arr, left, pivotIndex - 1);
        quickSort(arr, pivotIndex + 1, right);
    }
}

public static int partition(int[] arr, int left, int right) {
    int pivot = arr[left];
    int i = left + 1;
    int j = right;
    while (true) {
        while (i <= j && arr[i] < pivot) {
            i++;
        }
        while (i <= j && arr[j] > pivot) {
            j--;
        }
        if (i >= j) {
            break;
        }
        swap(arr, i, j);
        i++;
        j--;
    }
    swap(arr, left, j);
    return j;
}

public static void swap(int[] arr, int i, int j) {
    int temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
}