// app8_16, 類的復習
class Caaa
{
   int num;
   void set_num(int n){
      num=n;
      System.out.println("num= "+ num); 
   }
}

public class app8_16
{
   public static void main(String args[])
   {  
      Caaa aa= new Caaa();
      aa.set_num(5);
   }
}