递归

 

package com.test;

 

publicclass Factorial {

 

    publicint f (int n) {

       if (n == 1){

           return 1;

       }else {

           int k = f(n-1);

           return k*n;

          

       }

    }

    publicstaticvoid main(String ags[]){

       Factorial fact = new Factorial();

       int result = fact.f(4);

       System.out.println(result);

    }

}