// app9_13, Object類里的toString() method
class Caaa
{
   private int num;
   
   public Caaa(int n){
      num=n;
   }  
}   

public class app9_13
{
   public static void main(String args[]){
      Caaa a=new Caaa(2);

      System.out.println(a.toString());      
   }
}