Computer Science 4
Java for Video Games

Exam 2
Sample Questions

• Covers chapters 7, 8, and 10 from the course textbook: Java Concepts (4th Edition) by Cay Horstmann
• Debugging
  • Describe the difference between a syntax error and a semantic error
  • Given code, hand simulate it and describe what it does
  • Given code with a bug in it, explain what the bug is and how to fix it
• Collections
  • Describe the difference between Java's built-in array and Java's class ArrayList
  • When would you use one instead of the other
  • Write code to create a collection and add items to it
• Loops
  • Describe the purpose of the four parts of a loop (initialization, test, update, and body)
  • Write code for a loop that positions a collection of sprites in a pattern
  • Write code for a loop that determines an extreme value within a collection (i.e., the max or min value)
  • Write code for a loop that calculates a value (i.e., how many intersections, how many visible, average color, etc.)
• Games and Levels
  • Explain why the method initState cannot be used directly to initialize each new level
  • Given a game, describe how to determine if the game is over or the level is over
  • Given a game, describe how to change some property based on different levels
• Colors
  • Explain how the primary colors red, green, and blue are combined to create a single color value
  • What is the range of values for the red, green, and blue components of a color
  • How is a grey scale color represented
  • How is a random color created
  • Write code to create a range of colors that are stored in a collection
• Questions related to your assignments
  • Given code for a GeneralPath or CAG sprite, draw the resulting sprite that would appear on the screen
  • Given a game, write code within a Tracker to animate its sprite