复习下java语法，写一个分解质因数的程序

import java.util.*;

public class primeFactor {
    public static void main(String[] args)
    {
        int x;
        Scanner in = new Scanner(System.in);
        System.out.print("请输入一个正整数");
        x = in.nextInt();
        new PrimeSplit(x);
    }
}

class PrimeSplit
{
    int k = 2;
    public PrimeSplit(int x)
    {
        if(x<=1) 
        {
            System.out.println(x+"是无效的被分解数");
        }
        else if(x==2)
        {
            System.out.println(x+"分解后的质因数为：1*"+x);
        } 
        else
        {
            System.out.print(x+"分解后的质因数为：1");
            while(k<=x)
            {
                if(x%k==0)
                {
                    System.out.print("*"+k);
                    x = x/k;
                }
                else
                {
                    k++;
                }
            }
        }
        
    }
}

代码参考自 http://blog.csdn.net/shylx123/article/details/6362824