  class Test3-11
 {
         public static void main(String[] args) {
             Student stu1 = new Student("",10011,11); 
             System.out.println(stu1.getObjNum ());   //ͨstu1ȡֵ
             Student stu2 = new Student("",10012,12);   
             //ͨstu1ٴλȡֵ
System.out.println(stu1.getObjNum ());  
             System.out.println(stu2.getObjNum ());   //ͨstu2ȡֵ
         }
      }//end of class Main
class Student {
         int stu_code;                               
         String stu_name;                            
         int deptCode;                              
         private static int counter = 0;  
         int objNum;                           
         protected Student(String name,int sCode,int dCode) {
             counter++;
             objNum = counter;
             stu_name = name;                         
             stu_code = sCode;                        
             deptCode = dCode;                       
         } 
         int getObjNum() {
            return counter;
         }        
      }//end of class Student
