  public class Test3-4                                 //һ
      {
         public static void main(String[] args)        
         {
           Student stu1 = new Student();                     
           stu1.stu_name = "";
           stu1. setStuCode(10011);
           stu1.setDeptCode(11);
           Student stu2 = new Student("",10012,12);   
           stu1.printMaterial();
           stu2.printMaterial();
         }
      }//end of class Main
class Student                                     //һѧ
      {
         int stu_code;                               
         String stu_name;                            
         int deptCode;                                                                  
         public Student()                          
         {                                  
         }
         protected Student(String name,int sCode,int dCode)  
         {
             stu_name=name;                         
             stu_code= sCode;                        
             deptCode =dCode;                       
         }
         void setStuName(String name)
         {
             stu_name = name;
         }
         void setStuCode(int code)
         {
             stu_code = code;
         }
         void setDeptCode(int dCode)
         {
             deptCode = dCode;
         }
         public void printMaterial()
         {
            System.out.println(""+ stu_name);
            System.out.println("ѧţ"+ stu_code);
            System.out.println("ѧԺţ"+ deptCode);
         }
      }//end of class Student
