快速排序java代码

import java.util.Scanner;
import java.util.ArrayList;
public class Paixu2{
	public int[] alist;
	//快速排序
	public static void main(String args[]) {
		Paixu2 he=new Paixu2();
		he.setup();
		he.look();
		he.go(0,9);
		he.look();
	}
	public void setup(){
		Scanner sc=new Scanner(System.in);
		alist=new int[10];
		for(int i=0;i<10;i++){
			alist[i]=sc.nextInt();
		}
	}
	public void look(){
		System.out.println("");
		for(int i=0;i<10;i++){
			System.out.print(alist[i]);
		}
	}
	public void change(int i,int j){
		int tempp;
		tempp=alist[i];
		alist[i]=alist[j];
		alist[j]=tempp;
	}
	public void go(int i,int j){
		if(i>j){
			return;
		}
		int s=i;
		int pointi=i;
		int pointj=j;
		while(pointj!=pointi){
			while(pointj>pointi&&alist[pointj]>=alist[s]){
				pointj--;
			}
			while(pointj>pointi&&alist[pointi]<=alist[s]){
				pointi++;
			}
			if(pointj>pointi){change(pointi,pointj);}
		}
		change(s,pointj);
		go(i,pointi-1);
		go(pointi+1,j);

	}

}