class Student                                      
      {
         public int stu_no = 10011;                         //ѧ
         public String stu_name;                           //ѧ
         public String specialty;                           //רҵ                           
      }//end Student
      class GraduateStudent extends Student
      {
         public int stu_no = 20011;             //ظԱstu_no
         public String tutor;                   //ʦ
         public String spec_direction;           //о
         void printStu_no (int stu_no)          //βαԼĳԱ
         {
            System.out.println ("stu_no is " + stu_no);     //βα
        System.out.println ("stu_no of Student is " + super.stu_no); 
        System.out.println ("stu_no of GraduateStudent is" + this.stu_no);
         }
         public static void main(String[] args)         
         {  int stu_no = 40011;               //ֲԼĳԱ
            System.out.println ("stu_no = " + stu_no);
            GraduateStudent stu1 = new GraduateStudent();                     
            stu1.printStu_no(30011);            
         }
      }//end GraduateStudent
