Class and Object in Object Oriented Programming

Classes and Objects

The video explains the relationship between classes and objects in object-oriented programming using a cookie mold as an analogy: the class is the mold or blueprint, while objects are the individual cookies made from it. A class defines what its objects contain and can do. Creating an object from a class gives those features a specific instance.

VB.NET Student Class

The demonstration builds a Student class with three main parts:

• Properties store information about an object. The example uses Name (String), Age (Integer), and Course (String). Access modifiers such as Public and Private control where members can be accessed.
• Constructor initializes an object’s properties when it is created. The example constructor accepts a name, age, and course, then assigns those values to the corresponding properties.
• Methods define actions or behavior. The example includes:
  • DisplayInformation, a procedure that shows the student’s name, age, and course.
  • IsAdult, a function that returns True if the student is at least 18 and False otherwise.

Demonstration Workflow

1. Add a class named Student.
2. Declare properties for the student’s name, age, and course.
3. Add a constructor that receives those values and initializes the properties.
4. Add a procedure to display the student’s information.
5. Add a function that checks whether the student is at least 18.
6. Create a Student object and pass values to its constructor—for example, a student aged 20 enrolled in BSCS.
7. Call the object’s display procedure and adult-check function. The demonstration shows the student’s details and returns True for the adult check.
8. Create additional Student objects to reuse the class instead of rewriting the same structure and behavior.

Benefits of Using Classes

• Reusability: Create multiple objects from one class and reuse its properties and methods.
• Maintainability: Update or debug student-related code in the Student class without changing unrelated classes.
• Modularity: Organize a complex application into smaller, focused parts—for example, separate classes for students, teachers, and courses.

Speakers and Sources

The presenter is unnamed in the subtitles; the video is published by Christopher Guiang. The examples include the cookie-mold analogy and a VB.NET Student class demonstration. No other speakers or external sources are identifiable in the subtitles.