Page 116 - ComputerScience_Class_11

44 st1.accept();

45 st2.accept();
46 st1.display_result();

47 st2.display_result();
48 }
49 }

What does the above code mean?
1. In the above program, two objects are created. The names of the objects are “st1” and “st2”. The syntax to create
the objects is “student <name of object> = new student();”.
2. This class has a constructor, which is invoked when the objects are created and all data members are assigned with
the default values provided in the constructor.

3. After creating the objects st1 and st2, the accept() method is invoked by using dot(.) operator and the data members
name, roll_no, comp_m and math_m are assigned with the values accepted from the user.

4. Then, the display_result() method is invoked by using dot(.) operator and from this method, the calculate_marks()
is called. The calculate_marks() method returns the average of the marks, which is displayed in the display_result().
The output of the preceding program is as follows:

BlueJ: Terminal Window - Java
Options

Enter name of the student : Ram Kumar
Enter roll number of the student : 1
Enter computer marks of the student : 98
Enter math marks of the student : 98
Enter name of the student : Amit Singh
Enter roll number of the student : 2
Enter computer marks of the student : 90
Enter math marks of the student : 80
---------------------------------------------------------------------------------------------------------------
Name Roll Computer Marks Maths Marks
Ram Kumar 1 98 98
Average Marks Total Marks
98.0 196
---------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------
Name Roll Computer Marks Maths Marks
Amit Singh 2 90 80
Average Marks Total Marks
85.0 170
---------------------------------------------------------------------------------------------------------------

5.2.2 Properties of Class and Object
Class and object have the following properties:
• Class is an object factory: Factories are the places that produce products of the same kind. A class acts as a factory
as by using it, similar types of objects are created with different characteristics and common behaviours. We can
also say a class is a blueprint of objects. Hence, a class is called an object factory.

114 Touchpad Computer Science (Ver. 3.0)-XI