用2种方式求阶乘

/**
 *JieCheng.java
 *
 * @author LiFangHai
 *
 * @version 1.00 2010/8/18
 */


public class JieCheng {
 

    public int first(int val) {
  
        if(val > 1)
        {
          return val *= this.first(val-1);
        }else{
          return 1;
        }
    }
    
    
    public int second(int val)
    {
     int ab = val;
     while(val>=1)
     {
      if(val==1)
      {
       ab*=1; break;
      }
      else
      {
       ab *= (val-=1);
      }
     }
     return ab;
    }
    
    public static void main (String[] args) {
     System.out.println ("用递归求10! ="+ new JieCheng().first(10));
     System.out.println ("*************");
     System.out.println ("用循环求10！="+ new JieCheng().second(10)); 
 }
}

 分别用递归方式和循环法方式实现求阶乘算法！