Object Oriented Programming Through Java by Pearson

6.10 Inheritance: Packages: Interfaces

36. }//end of class Student

37. }

38. // Driver class

39. class Student2bDemo{

40. public static void main(String[] args){

41. // create an object of Student

42. Student2b std1 = new Student2b(“Ramesh”,50595,97.8,”X”);

43. std1.ComputeGrade(std1);

44. std1.DisplayData(std1);

45. System.out.println(“Total Marks:” + std1.GetMarks());

46. System.out.println(„Grade:“ + std1.GetGrade());

47. }

48. }//end of class Student2bDemo

Line No.2:       shows that Student2b extends to Person2b. This means that it has

access to all public and protected members like protected String

name, protected int idNo and method DisplayData() of Person2b.

Line Nos. 4 and 5: declare Student2b private data and Line Nos. 20–23 define mutator