AP Computer Science A

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2021 AP Computer Science A Exam Guide 

Administration 1

Administration 2

Administration 3

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AP Computer Science A unit 1 covers primitive types, variables, data types, expressions, assignments and so much more to prepare you for your exam and make sure you understand everything in unit 1.

Unit 1: Primitive Types

Primitive Types

To help you understand unit 2 of AP Computer Science A take a look at all of our resources. We cover using objects, void methods, non-void methods, string objects, string methods, and so much more! With helpful examples and study guides you will understand unit 2 in no time!

Unit 2: Using Objects

Using Objects

Take a look at these resources on AP Computer Science A unit 3 to help you prepare. We cover boolean expressions with examples of compound, equivalent, and complex boolean expressions, along with if-statements, else-if statements and comparing objects. All of these resources will make sure you have a better understanding of unit 3.

Unit 3: Boolean Expressions and if Statements

Boolean Expressions and if Statements

Learn everything you need to know about AP Computer Science A unit 4 using these resources. We cover the role of iteration, along with nested iteration and code analysis. There are also resources explaining, with examples, while loops and for loops to ensure you know everything about unit 4!

Unit 4: Iteration

Iteration

These resources will make sure you understand AP Computer Science A unit 5. Study guides, explanations and examples are available for all the important topics including constructors, the mutator method, writing methods, accessor methods, along with so much more. 

Unit 5: Writing Classes

Writing Classes

Resources to help you review and understand unit 6 of AP Computer Science A. We cover arrays, with an overview, how to create them, and more, as well as detailed descriptions and examples for traversing arrays, array loops, and algorithms for arrays. 

Unit 6: Array

Array

Take a look at all of these resources for unit 7 of Computer Science A. They cover an introduction into an arraylist, along with helpful examples and explanations for methods, traversing arraylists, sorting arraylists, and the ethical dilemmas of data collection, along with so much more. These resources will make sure you understand unit 7!

Unit 7: ArrayList

ArrayList

Make sure to check ou these resources for AP Computer Science A unit 8. We provide helpful resources and examples so you can gain a better understanding of 2D arrays and traversing 2D arrays, along with other important topics. These resources will make sure you fully understanding unit 8 of AP Computer Science A!

Unit 8: 2D Array

2D Array

A complete overview of the important topics for unit 9 of AP Computer Science A. We cover inheritance, constructors with subclasses, super keyword, polymorphism, and object superclasses to help you study and prepare. 

Unit 9: Inheritance

Inheritance

Learn everything you need to know about unit 10 of AP Computer Science A. We cover recursion and how to use recursion with sorting and searching, including linear and sequential searches, binary searches, insertion sorts, selection sorts and merge sorts. These examples and explanations will make sure you understand this final unit!

Unit 10: Recursion

Recursion

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Check out these resources that will cover all the important topics of AP Computer Science A so you can prepare for your exam. With study guides, review sheets and review videos with sample problems and helpful tips, these resources will make sure you are ready for your exam!

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First Unit

The Big Takeaway From This Unit

Unit Overview

1.1: Why Programming? Why Java?

Intro to Programming

The Anatomy of a Java Program

System.out.println() vs System.out.print()

1.2: Variables and Data Types

Primitive Data Types

Variables

Input Using the Scanner Class

Variables and Primitive Data Types

1.3: Expressions and Assignment Statements

Basic Math in Java

Order of Operations in Java

Expressions and Assignment Statements

1.4: Compound Assignment Operators

Compound Operators

Incrementing and Decrementing

Compound Assignment Operators

1.5: Casting and Ranges of Variables

Integers to Doubles

Rounding

Casting and Ranges of Variables


The Big Takeaway Of This Unit

Exam Weighting

Enduring Understanding

Building Computational Thinking

Main Ideas for This Unit

2.1: Objects: Instances of Classes

Using Objects Overview and 2.1 Instances of Classes

Constructors and Initialization

Constructor Overloading

Null Objects

Creating and Storing Objects (Initialization)

Introduction to Methods

Void Methods vs. Non-Void Methods

Static vs. Non-Static Methods

Calling a Void Method

How To Write and Call Methods With Parameters

Overloading Methods

Calling a Void Method With Parameters

Returning Integers/Doubles

Returning Booleans

Returning Strings

Returning Objects and Other Reference Types

Calling a Non-Void Method

A Technical Look At Strings

Escape Characters

String Concatenation

String Objects: Concatenation, Literals, and More

Intro to External Libraries and APIs

About the String Class

String Methods: Accessing Substrings

String Methods: Equality and Comparison

String Methods

Absolute Values

Exponents and Square Roots

Random Numbers

Using the Math Class

The Big Takeaway Of This Unit

3.1: Boolean Expressions

Unit 3 Overview and Boolean Expressions

3.2: If Statements and Control Flow

Introduction to Conditional Statements

If Statements

Example: Even Number Checker

If Statements and Control Flow

3.3: If-Else Statements

Example: Number Rounding

If-Else Statements

3.4: Else If Statements

Example: Divisibility Counter

Example: Leap Year Decider

Else If Statements

3.5: Compound Boolean Expressions

Nested Conditionals

Boolean Logical Operators

Compound Conditional Statements

Compound Boolean Expressions

3.6: Equivalent Boolean Expressions

Proof By Simplification

Proof By Testing All Cases

Equivalent Boolean Expressions

3.7: Comparing Objects

What it Means When Objects Are Equal

The Equals Method

Comparing Objects

4.1: While Loops

What is Iteration?

Introduction to While Loops

Possible Issues With Loops

While Loop Structures

Making Sure Your Loop Works: The Four Loopy Questions

Break and Continue

Try-Catch Statements and Exception Handling

Algorithms Using While Loops

Overview of Unit 4: Iteration and 4.1 While Loops

Introduction to For Loops

Example: Fibonacci Numbers

For Loops

Reversing a String

Get All Substrings of Length N

Developing Algorithms Using Strings

Example: Generating the Next N Prime Numbers After a Certain Number

Nested Iteration

5.1: Anatomy of a Class

Introduction to Class Writing

The Parts of a Class

This Guide's Design Constraints and Introduction to Software Programming

Overview of Unit 5: Writing Classes and 5.1 Anatomy of a Class

Impacts

System Reliability

Intellectual Property

Ethical and Social Implications of Computing Systems

The Student Class

Default Values By Data Type

The Assignment Constructor

Constructors

Types of Comments and Their Uses

Single-Line and Multi-Line Comments

Javadoc Comments

Commenting our Two Classes

Documentation With Comments

Introduction to Accessor Methods

Writing Accessor Methods for Our Two Classes

Accessor Methods

Introduction to Mutator Methods

Writing Mutator Methods for the Student Class

Mutator Methods

Writing Methods

Java Example

Introduction to Static Variables and Methods

Adding Static Variables and Methods

Static Variables and Methods

Scope

Access

Scope and Access

Introduction to This

Finishing Our Classes

This Keyword

Main Ideas for this Unit

6.1: Array Creation and Access

Introduction to Arrays

Making Arrays

Accessing Elements in Arrays

Unit 6 Arrays Overview and 6.1 Array Creation and Access

What is Traversing?

Traversing Arrays

Structure for Enhanced 'For Loops'

Enhanced For Loop For Arrays

Topic 6.4

Developing Algorithms Using Arrays

7.1: Introduction to ArrayList

Introduction to the Java Collections Framework

Generics

Creating ArrayLists

Unit 7 Overview and 7.1: Introduction to ArrayList

7.2: ArrayList Methods 

Adding Elements to the End Of an ArrayList

ArrayList Methods

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💻AP Computer Science A - Big Reviews: Finals & Exam Prep

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