Name: AP CSA: Unit 2 and 3 Review
Uploaded: 2020-11-11T00:15:59.285Z
Description: A review of AP CSA Units 2 and 3

AP Computer Science A

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

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

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 & 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

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

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

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

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 

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

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

Frequently Asked Questions

AP Cram Sessions 2021

First Unit

Previous Exam Prep

Study Tools

Exam Skills

Overview

1.1 Why Programming? Why Java?

1.2 Variables and Primitive Data Types

Input

1.3 Expressions and Assignment Statements

1.4 Compound Assignment Operators

1.5 Casting and Ranges of Variables

Unit 1 Overview: Primitive Types

Why Programming? Why Java?

Intro to Programming

The Anatomy of a Java Program

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

Variables and Data Types

Primitive Data Types

Variables

Input Using the Scanner Class

Variables and Primitive Data Types

Expressions and Assignment Statements

Basic Math in Java

Order of Operations in Java

Basic Math Practice Problems in Java

Compound Assignment Operators

Compound Operators

Incrementing and Decrementing

Casting

Integers to Doubles

Doubles to Integers

Rounding

Casting and Ranges of Variables


The Big Takeaway Of This Unit

Unit Overview

Exam Weighting

Enduring Understanding

Building Computational Thinking

Main Ideas for This Unit

2.1: Objects: Instances of Classes


2.2 Creating and Storing Objects (Initialization)

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 Using the Math Class

Unit 2 Overview: Using Objects

What are Objects?

What is a Class?

Objects are Instances of Classes

Real-world Example

Objects: Instances of Classes

Constructors and Initialization

Constructor Overloading

Null Objects

Creating and Storing Objects (Instantiation)

Introduction to Methods

Void Methods vs. Non-Void Methods

Static vs. Non-Static Methods

Methods Practice Problems

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

Non-Void Methods Practice Problems

Calling a Non-Void Method

A Technical Look At Strings

Escape Characters

String Concatenation

String Concatenation Practice Problems

Summary of String Objects

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

AP CS A Java Quick Reference Sheet

String Method Practice Problems

indexOf Practice Problems

Length Practice Problems

Substring Practice Problems

compareTo Practice Problems

String Methods

Introduction

Integer Wrapper Class

Double Wrapper Classes

Autoboxing

Practice Problems

Wrapper Classes: Integer and Double

Absolute Values

Exponents and Square Roots

Random Numbers

Using the Math Class

The Big Takeaway Of This Unit


Unit Overview


Building Computational Thinking

Potential Unit 3 Topics

Unit 3 Key Concepts

Unit 3 Overview: Boolean Expressions and if Statements

Boolean Operators

Boolean Expressions

Introduction to Conditional Statements

If Statements

Example: Even Number Checker

If Statements and Control Flow

If-Else Statements

Example: Number Rounding

Else If Statements

Example: Divisibility Counter

Example: Leap Year Decider

Nested Conditionals

Boolean Logical Operators

Compound Conditional Statements

Compound Boolean Expressions

Proof By Simplification

Basic Theorems


Consensus Theorems (Nice to know, but not required)

Commutative Law (boolean AND and OR are commutative)

Associative Law (boolean AND and OR are associative)

Distributive Law (boolean AND distributes over boolean OR)

DeMorgan's Theorems (Important to know) (boolean NOT does not distribute over boolean OR or AND)

Proof By Testing All Cases

Truth Table Example 1

Truth Table Example 2

Equivalent Boolean Expressions

What it Means When Objects Are Equal

The Equals Method

Comparing Objects

4.1 While Loops

4.2 For Loops

4.3 Developing Algorithms Using Strings

4.4 Nested Iteration

Unit 4 Overview: Iteration

What is Iteration?

Introduction to While Loops

Possible Issues With Loops

Loop Condition Always True

Loop Condition Always False

While Loop Structures

Fixed Number of Repetitions

Variable Number of Repetitions Using A Sentinel

Variable Number of Repetitions Using A Flag

Making Sure Your Loop Works: The Four Loopy Questions

Break and Continue

Try-Catch Statements and Exception Handling

Algorithms Using While Loops

Finding Divisibility Without Modulo

Finding the Digits in an Integer From Small to Large Magnitude

Determining Frequency of a Condition

Determine a Minimum from Inputs

Determine a Maximum from Inputs

Computing a Sum from Inputs

Computing an Average from Inputs

While Loops

Introduction to For Loops

Example: Fibonacci Numbers

For Loops

Reversing a String

Get All Substrings of Length N

Check for a Substring

Count Substrings Satisfying a Criteria

Developing Algorithms Using Strings

Example: Printing a Triangle

Example: Printing a Number Triangle

Example: Break in Nested Loops

Example: Continue in Nested Loops

Nested Iteration

Tracing

Informal Code Analysis

5.1 Anatomy of a Class

5.2 Constructors

5.3 Documentation with Comments

5.4 Accessor Methods

Unit 5 Overview: Writing Classes

AP CSA: Unit 2 and 3 Review

AP CSA: Unit 2 and 3 Review

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AP CSA: Unit 2 and 3 Review

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