Computer Science A
  • Introduction
  • Overview
  • Course at a Glance
  • Course Exam and Description
  • Quick Reference Sheet
  • Unit 1 Primitive Types
    • 1.1 Why Programming? Why Java?
    • 1.2 Variables and Data Types
    • 1.3 Expressions and Assignment Statements
    • 1.4 Compound Assignment Operators
    • 1.5 Casting and Ranges of Variables
  • Unit 2 Using Objects
    • 2.1 Objects: Instances of Classes
    • 2.2 Creating and Storing Objects (Instantiation)
    • 2.3 Calling a Void Method
    • 2.4 Calling a Void Method with Parameters
    • 2.5 Calling a Non-void Method
    • 2.6 String Objects: Concatenation, Literals, and More
    • 2.7 String Methods
    • 2.8 Wrapper Classes: Integer and Double
    • 2.9 Using the Math Class
  • Unit 3 Boolean Expressions and if Statements
    • 3.1 Boolean Expressions
    • 3.2 if Statements and Control Flow
    • 3.3 if-else Statements
    • 3.4 else if Statements
    • 3.5 Compound Boolean Expressions
    • 3.6 Equivalent Boolean Expressions
    • 3.7 Comparing Objects
  • Unit 4 Iteration
    • 4.1 while Loops
    • 4.2 for loops
    • 4.3 Developing Algorithms Using Strings
    • 4.4 Nested Iteration
    • 4.5 Informal Code Analysis
  • Unit 5 Writing Classes
    • 5.1 Anatomy of a Class
    • 5.2 Constructors
    • 5.3 Documentation and Comments
    • 5.4 Accessor Methods
    • 5.5 Mutator Methods
    • 5.6 Writing Methods
    • 5.7 Static Variables and Methods
    • 5.8 Scope and Access
    • 5.9 this Keyword
    • 5.10 Ethical and Social Implications of Computing Systems
  • Unit 6 Array
    • 6.1 Array Creation and Access
    • 6.2 Traversing Arrays
    • 6.3 Enhanced for Loop for Arrays
    • 6.4 Developing Algorithms Using Array
  • Unit 7 ArrayList
    • 7.1 Introduction to ArrayList
    • 7.2 ArrayList Methods
    • 7.3 Traversing ArrayLists
    • 7.4 Developing Algorithms Using ArrayLists
    • 7.5 Searching
    • 7.6 Sorting
    • 7.7 Ethical Issues Around Data Collection
  • Unit 8 2D Array
    • 8.1 2D Arrays
    • 8.2 Traversing 2D Arrays
  • Unit 9 Inheritance
    • 9.1 Creating Superclasses and Subclasses
    • 9.2 Writing Constructors for Subclasses
    • 9.3 Overriding Methods
    • 9.4 super Keyword
    • 9.5 Creating References Using Inheritance Hierarchies
    • 9.6 Polymorphism
    • 9.7 Object Superclass
  • Unit 10 Recursion
    • 10.1 Recursion
    • 10.2 Recursive Searching and Sorting
  • Free Response Questions
    • 2021
    • 2022
    • 2023
    • 2024
  • Code
    • Week 1
    • Week 2
    • Week 3
    • Week 4
    • Week 5
    • Week 6
    • Week 7
    • Week 8
    • Week 9
    • Week 10
    • Week 11
    • Week 12
    • Week 13
    • Week 14
    • Week 15
    • Week 16
    • Week 17
    • Week 18
    • Week 19
    • Week 20
    • Week 21
    • Week 22
    • Week 23
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Introduction

AP Computer Science A is an introductory college-level computer science course. Students cultivate their understanding of coding through analyzing, writing, and testing code as they explore concepts like modularity, variables, and control structures.

This website is written by Mr. Cheng, a high school computer science teacher and adjunct professor. He can be reached at mcheng @ appinventor.net He is available for consulting and tutoring.

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