// app9_14,覆蓋Object類(lèi)里的toString() method
class Caaa
{
   private int num;
   
   public Caaa(int n){
      num=n;
   }  
   
   public String toString(){    // 覆蓋toString() method
      String str="toString() called, num="+num;
      return str;      
   }
}   

public class app9_14
{
   public static void main(String args[]){
      Caaa a=new Caaa(2);

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