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Java Review for the AP CS A Exam

Assignments

• Assignments

Table of Contents

• 1. Preface and Getting Setup
  • 1.1. Preface
    • 1.1.1. New Ebook
    • 1.1.2. About the Exam
    • 1.1.3. Acknowledgements
    • 1.1.4. Contributors
    • 1.1.5. License
  • 1.2. Pretest for the AP CS A Exam
  • 1.3. Exercises
• 2. Java Basics: Classes and Objects
  • 2.1. What is Java?
  • 2.2. What is a Class and an Object?
  • 2.3. First Example Classes
  • 2.4. Compiler Errors
    • 2.4.1. Compile Time Error 1
    • 2.4.2. Compile Time Error 2
    • 2.4.3. Compile Time Error 3
  • 2.5. An Object Oriented Class Example
  • 2.6. Running a Java Program
  • 2.7. Parts of a Java Class
    • 2.7.1. Fields - Instance Variables
    • 2.7.2. Constructors
    • 2.7.3. Methods
  • 2.8. Intro to Java - Summary
    • 2.8.1. Concept Summary
    • 2.8.2. Java Keyword Summary
    • 2.8.3. Example Class Diagram and Class
    • 2.8.4. Practice
  • 2.9. Exercises
• 3. Variables
  • 3.1. What is a Variable?
    • 3.1.1. Variable Types on the Exam
  • 3.2. Declaring Variables in Java
  • 3.3. Changing Variables in Java
  • 3.4. Naming Variables
  • 3.5. Operators
    • 3.5.1. Modulo
    • 3.5.2. Modulo on Past Exams
    • 3.5.3. Shortcut Operators
  • 3.6. Casting Variables
  • 3.7. Integer Min and Max
  • 3.8. Random Numbers
  • 3.9. Common Mistakes
  • 3.10. Easy Multiple Choice Questions
  • 3.11. Medium Multiple Choice Questions
  • 3.12. Hard Multiple Choice Questions
  • 3.13. Variables - Summary
    • 3.13.1. Concept Summary
    • 3.13.2. Java Keyword Summary
    • 3.13.3. Practice
  • 3.14. Code Practice with Variables
  • 3.15. Mixed Up Code Practice
• 4. Strings
  • 4.1. What is a String?
  • 4.2. Declaring and Creating Strings
  • 4.3. String Methods on the Exam
  • 4.4. String Equality
    • 4.4.1. Using the New Keyword
    • 4.4.2. Using String Literals
  • 4.5. String Operators - Concatenation
  • 4.6. Common Mistakes
  • 4.7. More Practice
  • 4.8. Easy Multiple Choice Questions
  • 4.9. Medium Multiple Choice Questions
  • 4.10. Hard Multiple Choice Questions
  • 4.11. Strings - Summary
    • 4.11.1. Concept Summary
    • 4.11.2. Java Keyword Summary
    • 4.11.3. Method Summary
    • 4.11.4. Practice
  • 4.12. Code Practice with Strings
  • 4.13. Mixed Up Code Practice
• 5. Conditionals
  • 5.1. Conditionals
  • 5.2. Three or More Options
  • 5.3. Complex Conditionals
  • 5.4. Short Circuit Evaluation
  • 5.5. DeMorgan’s Laws
  • 5.6. Common Mistakes
  • 5.7. More Practice
  • 5.8. Easy Multiple Choice Questions
  • 5.9. Medium Multiple Choice Questions
  • 5.10. Hard Multiple Choice Questions
  • 5.11. Free Response - Time
    • 5.11.1. How to solve this problem
  • 5.12. Conditional - Summary
    • 5.12.1. Concept Summary
    • 5.12.2. Java Keyword Summary
    • 5.12.3. Practice
  • 5.13. Code Practice with Conditionals
  • 5.14. Mixed Up Code Practice
• 6. Magpie Chatbot Lab
  • 6.1. Lab Requirement
  • 6.2. Magpie Lab
  • 6.3. Activity 1: Exploring Chatbots
  • 6.4. Keywords
  • 6.5. Activity 2: Running Simplified Magpie Code
  • 6.6. Exercises
  • 6.7. Activity 2: Actual Code - (Optional)
  • 6.8. Activity 3: Better Keyword Detection
    • 6.8.1. More String Methods
    • 6.8.2. Better Keyword Detection
    • 6.8.3. Exercise: Use the new method
    • 6.8.4. Questions: Prepare for the next activity
  • 6.9. Activity 4: Responses that Transform Statements
    • 6.9.1. Exercises:
  • 6.10. Mixed Up Code Practice
• 7. Loops
  • 7.1. Loops in Java
  • 7.2. While Loops
    • 7.2.1. Tracing Variables in Loops
  • 7.3. For Loops
  • 7.4. Nested For Loops
  • 7.5. Common Mistakes
  • 7.6. More Practice
  • 7.7. Easy Multiple Choice Questions
  • 7.8. Medium Multiple Choice Questions
  • 7.9. Hard Multiple Choice Questions
  • 7.10. Free Response Questions
    • 7.10.1. Free Response - Self Divisor A
    • 7.10.2. Free Response - String Scramble A
  • 7.11. Loops - Summary
    • 7.11.1. Concept Summary
    • 7.11.2. Java Keyword Summary
    • 7.11.3. Practice
  • 7.12. Code Practice with Loops
  • 7.13. Mixed Up Code Practice
• 8. Arrays
  • 8.1. Arrays in Java
    • 8.1.1. Declaring an Array
    • 8.1.2. Creating an Array
    • 8.1.3. Putting Values in an Array
    • 8.1.4. Initializing Array Values
    • 8.1.5. Array Length
  • 8.2. Looping with the For-Each Loop
  • 8.3. Using a For Loop to Loop Through an Array
  • 8.4. Looping From Back to Front
  • 8.5. Looping through Part of an Array
  • 8.6. Things to Watch For When Looping Through an Array
  • 8.7. Common Mistakes
  • 8.8. More Practice
  • 8.9. Easy Multiple Choice Questions
  • 8.10. Medium Multiple Choice Questions
  • 8.11. Hard Multiple Choice Questions
  • 8.12. Practice Exam for Arrays
  • 8.13. Free Response Questions
    • 8.13.1. Free Response - Self Divisor B
    • 8.13.2. Free Response - Horse Barn A
    • 8.13.3. Free Response - Horse Barn B
    • 8.13.4. Free Response - Sound A
    • 8.13.5. Free Response - Sound B
    • 8.13.6. Free Response - Number Cube A
    • 8.13.7. Free Response - Number Cube B
  • 8.14. Arrays - Summary
    • 8.14.1. Concept Summary
    • 8.14.2. Java Keyword Summary
    • 8.14.3. Practice
  • 8.15. Code Practice with Arrays
  • 8.16. Mixed Up Code Practice
• 9. List and ArrayList
  • 9.1. Lists
  • 9.2. The List Interface
  • 9.3. What is an Interface?
  • 9.4. Interfaces are like Contracts
  • 9.5. List Methods on the Exam
  • 9.6. Why Use a List?
  • 9.7. The ArrayList Class
  • 9.8. The Import Statement
  • 9.9. Declaring Lists
  • 9.10. Creating Lists
  • 9.11. Adding Values to a List
  • 9.12. Getting and Setting Values in a List
  • 9.13. Removing an Object at an Index
  • 9.14. Looping Through a List
  • 9.15. Comparing Arrays and Lists
    • 9.15.1. When to use a List or an Array
    • 9.15.2. Declaring an Array or List
    • 9.15.3. Creating an Array or List
    • 9.15.4. Setting the value at an index in an Array or List
    • 9.15.5. Getting the value at an index in an Array or List
    • 9.15.6. Getting the number of items in an Array or List
  • 9.16. Common Mistakes
  • 9.17. More Practice
  • 9.18. Easy Multiple Choice Questions
  • 9.19. Medium Multiple Choice Questions
  • 9.20. Hard Multiple Choice Questions
  • 9.21. Free Response Questions
    • 9.21.1. Free Response - String Scramble B
    • 9.21.2. Free Response - Climbing Club A
    • 9.21.3. Free Response - Climbing Club B
    • 9.21.4. Free Response - Climbing Club C
    • 9.21.5. Free Response - CookieOrder A
    • 9.21.6. Free Response - CookieOrder B
    • 9.21.7. Free Response - StringFormatter A
    • 9.21.8. Free Response - StringFormatter B
  • 9.22. List - Summary
    • 9.22.1. Concept Summary
    • 9.22.2. Practice
  • 9.23. Code Practice with ArrayLists
  • 9.24. Mixed Up Code Practice
• 10. Two-dimensional Arrays
  • 10.1. Introduction to 2D Arrays
  • 10.2. Array Storage
    • 10.2.1. How Java Stores 2D Arrays
  • 10.3. Declaring 2D Arrays
  • 10.4. Set Value(s) in a 2D Array
  • 10.5. Get a Value from a 2D Array
  • 10.6. Getting the Number of Rows and Columns
  • 10.7. Looping Through a 2D Array
  • 10.8. Use a For-Each to Loop Through an Array
  • 10.9. Loop Through Part of a 2D Array
  • 10.10. Common Mistakes
  • 10.11. More Practice
  • 10.12. Easy Multiple Choice Questions
  • 10.13. Medium Multiple Choice Questions
  • 10.14. Hard Multiple Choice Questions
  • 10.15. Free Response Questions
    • 10.15.1. Free Response - Gray Image A
    • 10.15.2. Free Response - Gray Image B
    • 10.15.3. Free Response - Route Cipher A
    • 10.15.4. Free Response - Route Cipher B
  • 10.16. 2d Arrays - Summary
    • 10.16.1. Concept Summary
    • 10.16.2. Practice
  • 10.17. Code Practice with 2D Arrays
  • 10.18. Mixed Up Code Practice
• 11. Object-Oriented Concepts
  • 11.1. Object-Oriented Programming Concepts
  • 11.2. Objects and Classes
    • 11.2.1. Person Class
    • 11.2.2. Die Class
    • 11.2.3. Coin Class
  • 11.3. Inheritance
  • 11.4. Specifying the Parent Class
  • 11.5. Why Use Inheritance?
  • 11.6. Association vs Inheritance
    • 11.6.1. Substitution Test for Inheritance
  • 11.7. The Equals Method
    • 11.7.1. The Inherited Equals Method from Object
    • 11.7.2. String Overrides Equals
    • 11.7.3. Overriding the Inherited Equals Method
  • 11.8. Overriding vs Overloading
  • 11.9. Using Super to call an Overridden Method
  • 11.10. Access to Inherited Private Fields
  • 11.11. Inheritance and Constructors
  • 11.12. Abstract Classes
    • 11.12.1. Abstract Classes Can’t be Instantiated
    • 11.12.2. Abstract Classes Exist to be Subclassed
  • 11.13. Inheritance and Interfaces
    • 11.13.1. What is the purpose of an interface?
  • 11.14. The Comparable Interface
  • 11.15. Polymorphism
  • 11.16. Common Mistakes
  • 11.17. More Practice
  • 11.18. Easy Multiple Choice Questions
  • 11.19. Medium Multiple Choice Questions
  • 11.20. Hard Multiple Choice Questions
  • 11.21. Free Response Questions
    • 11.21.1. Free Response - Trio A
    • 11.21.2. Trio Student Solution 1
    • 11.21.3. Trio Student Solution 2
    • 11.21.4. Trio Student Solution 3
    • 11.21.5. Free Response - APLine
  • 11.22. Object-Oriented Summary
    • 11.22.1. Concept Summary
    • 11.22.2. Java Keyword Summary
    • 11.22.3. Practice
  • 11.23. Code Practice with Object Oriented Concepts
  • 11.24. Mixed Up Code Practice
• 12. Recursion
  • 12.1. Recursion
  • 12.2. What is Recursion?
  • 12.3. Why use Recursion?
  • 12.4. Tracing Recursive Methods
  • 12.5. Common Mistakes
  • 12.6. Base Case Practice
  • 12.7. Trace Practice
  • 12.8. Try Writing a Recursive Method
  • 12.9. Easy Multiple Choice Questions
  • 12.10. Medium Multiple Choice Questions
  • 12.11. Hard Multiple Choice Questions
  • 12.12. Mixed Up Code Practice
  • 12.13. Recursion Summary
    • 12.13.1. Concept Summary
    • 12.13.2. Practice
  • 12.14. Code Practice for Recursion
  • 12.15. Recursion More Mixed Up Code Practice
• 13. Searching and Sorting
  • 13.1. Searching and Sorting
  • 13.2. Sequential Search
  • 13.3. Binary Search
  • 13.4. Selection Sort
  • 13.5. Insertion Sort
  • 13.6. Merge Sort
  • 13.7. Searching and Sorting Summary
    • 13.7.1. Concept Summary
    • 13.7.2. Practice
  • 13.8. Easy Multiple Choice Questions
  • 13.9. Medium Multiple Choice Questions
  • 13.10. Hard Multiple Choice Questions
  • 13.11. Exercises
• 14. Preparing for the Exam
  • 14.1. Preparing for the AP CS A Exam
  • 14.2. Exam 1 for the AP CS A Exam (not timed)
  • 14.3. Exam 2 for the AP CS A Exam (not timed)
  • 14.4. Exam 3 for the AP CS A Exam (not timed)
  • 14.5. Exam 4 for the AP CS A Exam (not timed)
  • 14.6. Exam 5 for the AP CS A Exam (not timed)
• 15. Timed Multiple-Choice Exams
  • 15.1. Practice Exam 1 for the AP CS A Exam
  • 15.2. Practice Exam 2 for the AP CS A Exam
  • 15.3. Practice Exam 3 for the AP CS A Exam
  • 15.4. Practice Exam 4 for the AP CS A Exam
  • 15.5. Practice Exam 1 for the first half of the AP CS A Curriculum
• 16. Free Response Practice Exam
  • 16.1. RandomStringChooser - Part A
    • 16.1.1. Try and Solve It
  • 16.2. RandomStringChooser - Part B
    • 16.2.1. Try and Solve It
  • 16.3. StringCoder - Part A
    • 16.3.1. Try and Solve It
  • 16.4. StringCoder - Part B
    • 16.4.1. Try and Solve It
  • 16.5. StudentAnswerSheet - Part A
    • 16.5.1. Try and Solve It
  • 16.6. StudentAnswerSheet - Part B
    • 16.6.1. Try and Solve It
  • 16.7. SkyView - Part A
    • 16.7.1. Try and Solve It
  • 16.8. SkyView - Part B
    • 16.8.1. Try and Solve It
  • 16.9. Hidden Word - Write Class
    • 16.9.1. Try and Solve It
  • 16.10. ArrayTester - Part A
    • 16.10.1. Try and Solve It
  • 16.11. ArrayTester - Part B
    • 16.11.1. Try and Solve It
  • 16.12. NumberGroup - Part A
    • 16.12.1. Try and Solve It
  • 16.13. NumberGroup - Part B
    • 16.13.1. Try and Solve It
  • 16.14. NumberGroup - Part C
    • 16.14.1. Try and Solve It
  • 16.15. Exercises
• 17. Mixed Up Code - Free Response Practice
  • 17.1. RandomStringChooser - Part A (Revisited)
    • 17.1.1. Mixed Up Code Practice
    • 17.1.2. More Mixed Up Code Practice
  • 17.2. RandomStringChooser - Part A
    • 17.2.1. Try and Solve It - Again
  • 17.3. RandomStringChooser - Part B
  • 17.4. RandomStringChooser - Part B - 2nd time
    • 17.4.1. Try and Solve It - Again
  • 17.5. Exercises
• 18. Working with Images
  • 18.1. Compute with Images
  • 18.2. Exercises
• 19. Turtles - Intro to Objects and Methods
  • 19.1. Compute with Turtles: Intro to Objects
  • 19.2. Exercises

Appendix 1

• DrJava (an IDE)
• Setting up DrJava for GridWorld

Indices

• Index

• Search Page

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