class GraduateStudent extends Student
{
           public String tutor;                          //ʦ
           public String spec_direction;                  //о
           static int lengthOfSchool = 3;
           static int getLengthOfSchool()
           {
                   return lengthOfSchool;
           }        
 
           public static void main(String[] args)         
           {
               GraduateStudent stu1 = new GraduateStudent();                       
                               
               System.out.println("ֱӷʸѧƣ                "
                      +Student.getLengthOfSchool() );
               System.out.println("ֱӷѧƣ                "
                      +stu1.lengthOfSchool );
              System.out.println("ķ(Ѹǵķ)ѧƣ" 
+stu1.getLengthOfSchool() );
           }
      }//end GraduateStudent
