java快速排序算法代码

package Mypackage;
 
public class QuickSort {
 
    public static void main(String[] args) {
        int[] arr = { 2,5,4,3,7,9,1,6,8 };
        quickSort(arr,2,7);
        for (int i = 0; i < arr.length; i++)
            System.out.print(arr[i] + " ");
    }
 
    public static void quickSort(int[] arr,int low,int high) {
        int i = 0,j,key = 0;
        if (low < high) {
            key = arr[low];
            i = low;
            j = high;
            while (i < j) {
                while (i < j && arr[j] > key)
                    j--;
                if (i < j)
                    arr[i++] = arr[j];
                while (i < j && arr[i] < key)
                    i++;
                if (i < j)
                    arr[j--] = arr[i];
            }
        }
        arr[i] = key;
        if (i > low + 1)
            quickSort(arr,low,i - 1);
        if (i < high - 1)
            quickSort(arr,i + 1,high);
    }
}