快排的java实现

话不多说，直接上代码：

public class QuickSort {
    public static void main(String[] args) {
        // int[] array = new int[]{34, 234, 32, 12, 45, 122, 33, 89, 23, 12};
        int[] array = new int[]{3, 24, 32, 12, 4, 122, 33, 89, 23, 12};
        sort(array,0,array.length-1);
        for (int i =0;i<=array.length-1;i++){
            System.out.print(array[i]+" ");
        }
    }
    public static void sort(int[] array, int lo, int hi){
        if(hi<=lo){
            return;
        }
        int j = partition(array, lo, hi);
        sort(array,lo,j-1);
        sort(array,j+1,hi);
    }
    public static int partition(int[] array, int lo, int hi){
        int value = array[lo];
        int left = lo;
        int right = hi+1;
        int mid;
        while (true){
            left++;
            while (array[left]value){
                if (right==lo)
                    break;
                right--;
            }

            if(left>=right)
                break;
            exch(array,left,right);
        }
        exch(array,lo,right);
        return right;
    }
    public static void exch(int[] array, int index1, int index2){//用于交换数组中两个数
        int mid;
        mid = array[index1];
        array[index1] = array[index2];
        array[index2] = mid;
    }
}