Introduction to Object-Oriented Programming

• Computer Science

Introduction to Object-Oriented Programming

What are some things that every person has in common?

What is a Class?

A class is a blueprint of code that is used to create objects.

Analogy. Humanity is a class. Although individual people are different, we all follow the same blueprint.

Thinking about things that exist in the world, what are examples of classes?

What is an Object?

An object is created from a class. It is an example of that class. If we had a class called "Car", the "Ford Mustang" would be an object of that class. An object is an instance of a class.

Out of each pair, decide which one is the class and which one is the object.

Classes

Objects

Fish

Tuna

Monkeys

Mammal

Car

Honda

Island

Exuma

Bahamas

Country

How can classes be helpful in code?

Constructors

This is a special method within a class that get called when an object is created. It can be used to set the values in the class.

Methods

Methods are FUNCTIONS inside a class/object

Properties

Properties are variables in a class that represent values related to that class. If we had a class called "Car", examples of properties could be "make", "model", and "year". What other properties would make sense to have in our "Car" class?

Code your first class!

• Code a class called "Student"
• In your constructor, set AT LEAST 2 properties called "Name" and "Grade".
• Code a method called "Greeting" that returns AT LEAST the name and grade of the student.

Use this class as an example

What is a class in object-oriented programming?

1. A function for data processing.
2. A programming language.
3. A blueprint for creating objects.
4. A type of database structure.

What is an object in OOP?

1. A library of functions.
2. A programming error.
3. A type of variable.
4. An instance of a class.

What is a constructor?

1. A file format for programs.
2. A type of data storage.
3. A framework for testing code.
4. A method for setting properties when creating objects.

What are properties in a class?

1. Functions for error handling.
2. Methods that perform actions.
3. Constructors for creating objects.
4. Attributes of an object.

What do methods do in a class?

1. Describe attributes of objects.
2. Store data for the class.
3. Create new classes.
4. Define behaviors of objects.