public class GraduateStudent extends Student
     {
          public String tutor;                          //ʦ
          public String spec_direction;                  //о
          static int lengthOfSchool = 3;
          static int getG_lengthOfSchool(){
              return lengthOfSchool;
          } 
          String getTutor () {
              return tutor;                       
          }
          void setTutor(String stu_tutor) {
              tutor = stu_tutor;                       
          }
           
          public static void main(String[] args) {
              GraduateStudent stu1 = new GraduateStudent();                       
              stu1.setStu_name("");                        
              stu1.setSpecialty ("Ӧü");                
              stu1.setSpec_direction ("˹");                
              stu1.setTutor ("");                          
              System.out.println(stu1.toString()+";о"+stu1.spec_direction 
                       + "ʦ" + stu1.tutor );   
              System.out.println("ֱӷʸѧƣ               "
                       +Student.lengthOfSchool );
              System.out.println("ü̳Ըķʸѧƣ "
                       +stu1.getLengthOfSchool() );
              System.out.println("ֱӷѧƣ               "
                       +stu1.lengthOfSchool );
              System.out.println("ķѧƣ      "
                       +stu1.getG_lengthOfSchool() );
           }
      }//end GraduateStudent
