Please enable JavaScript to use CodeHS

AP Computer Science A (Mocha - 2019 AP CSA Framework)

Classes and Object-Oriented Programming

In this module, students learn the basics of Object Oriented Programming in Java, which is a powerful programming paradigm. Students learn how objects store data and interact with each other in Java programs. Students design and implement classes and extend classes using inheritance.

Lessons

4.1 Introduction to Classes and Objects

  • What is a Class?
  • Quiz: Classes and Objects
  • The Rectangle Class
  • The Point Class
  • The Student Class
  • +4 more

4.2 Classes vs. Objects

  • Classes and Objects
  • Classes vs. Objects vs. Instances
  • Classes, Objects, and Instances
  • Creating Rectangle Objects
  • Text Messages

4.3 Using a Class as a Client

  • How to Use a Class
  • Quiz: Client of a Class
  • Using the Rectangle Class as a Client
  • Using the Randomizer Class as a Client
  • Coin Flips
  • +4 more

4.4 Writing Classes

  • Constructors
  • Quiz: Constructors
  • Rectangle toString
  • Student toString
  • toString for Flowers
  • +5 more

4.5 Writing Classes and Instance Methods

  • Writing Instance Methods
  • Quiz: Writing Methods
  • Area of a Rectangle
  • Moving a Point
  • Writing getPerimeter()
  • +4 more

4.6 Getter and Setter Methods

  • Getter and Setter Methods
  • Quiz: Getter and Setter Methods
  • Rectangle Getter Methods
  • Student Getter Methods
  • Text Messages Getter Methods
  • +4 more

4.7 Class Methods and Class Variables

  • Static Methods and Variables (Class Methods and Class Variables)
  • Quiz: Static Methods
  • Student Class Variables and Methods
  • Using the Math Class
  • Using Randomizer
  • +6 more

4.8 Wrapper Classes

  • Wrapper Classes
  • Quiz: Wrapper Classes
  • Creating Integers
  • Using Doubles
  • Autoboxing Example
  • +3 more

4.9 Method Overloading

  • Method Overloading
  • Method Overloading Quiz
  • Sum Method Overloading
  • Constructor Overloading
  • Average Method Overloading
  • +1 more

4.10 Local Variables and Scope

  • Local Variables and Scope
  • Local Variables and Scope Quiz
  • Instance Variable Scope
  • Local Variable Scope
  • Variable Shadowing
  • +1 more

4.11 Key Terms for Classes

  • Key Terms for Classes
  • Quiz: This Keyword
  • Rectangles and this
  • Batteries
  • Write Your Own CodeHS

4.12 Objects vs Primitives

  • Objects vs Primitives
  • Objects vs Primitives Quiz
  • Comparing Rectangles
  • Changing Dogs
  • Null Pointer Exception
  • +2 more

4.13 Inheritance

  • Inheritance
  • Quiz: Subclasses and Superclasses
  • Square is a Rectangle
  • Clothing Store
  • Inheritance Badge

4.14 Class Design and Abstract Classes

  • Class Design and Abstract Classes
  • Quiz: Class Design
  • The Shape Hierarchy
  • Classes for Dessert
  • Finding The Perimeters

4.15 Polymorphism

  • Polymorphism
  • Quiz: Polymorphism
  • Animal Sounds
  • Shape Areas
  • Fun with Solids

4.16 Object Superclass

  • Object Superclass
  • Quiz: Object Superclass
  • Default Values
  • Override toString
  • Override equals
  • +4 more

4.17 Interfaces

  • Interfaces
  • Quiz: Interfaces
  • Comparable Interface
  • Summable Interface
  • Fraction is Comparable
  • +2 more

4.18 Classes and Object-Oriented Programming Quiz

  • Classes and Object-Oriented Programming Quiz

Courses that include this module