快速排序 主方法（有一个数组，使用快速排序完成由小到大排列。）

package lx.day3;

import java.util.Arrays;

public class zy8 {
    public static void main(String[] args) {
        int[] a = {9, 8, 7, 6, 5, 4, 3, 2, 1};

        int m=a[4];
        int i=0;
        int j=8;
        int c=0;
        while (c<9) {
            while (i != j) {
                if (a[i] > m) {
                    int temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                    j--;
                    i++;
                    if(a[j]                         int temp1 = a[i];
                        a[i] = a[j];
                        a[j] = temp1;
                        i++;
                        j--;
                    }else {
                        j--;
                    }
                } else {
                   i++;
                }
            }
          c++;
            int temp2 = a[0];
            m= a[0];
            a[0] = temp2;
        }
      for (int a1:a){
          System.out.println(a1);
      }
    }
}