package A;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;

public class JosePhu {
    public static void main(String[] args) {
        Method method=new Method();
        //int[] a={5,9,4,2,1,10,7,8,3,6};
        int[] a={-9,78,0,0,23,-567,70};
        //left=0，是代表数组下标是从0开始的（即最左端），而不是a数组里的0
        method.quickSort(a,0,a.length-1);
        System.out.println(Arrays.toString(a));
    }
}

package A;

import java.util.Arrays;

public class Method {
    public void quickSort(int[] a,int L,int R){
        int left=L;
        int right=R;
        int temp=0;
        int pivot=a[(left+right)/2];
        while (left<right){
            while (a[left]<pivot){
                left++;
            }
            while (a[right]>pivot){
                right--;
            }
            if (left==right){
                break;
            }
            temp=a[left];
            a[left]=a[right];
            a[right]=temp;
            if (a[left]==pivot){
                right--;
            }
            if (a[right]==pivot){
                left++;
            }
        }
        if (left==right){
            left++;
            right--;
        }
        if (L<right){
            quickSort(a,L,right);
        }
        if (R>left){
            quickSort(a,left,R);
        }

    }
}