Refactoring Ball'java

1
Session 22

• Refactoring Ball.java
• CannonGame

2
Lets review Ball.java

• What things do Balls know about themselves?
• What actions can Balls respond to?

3
A couple of issues

• toFront() issue from Monday
• Closing issue from Monday
• A multiple ball world that looks nicer on the
  edges (version 3)

4
Lets review Ball.java

• What things do Balls know about themselves?
• What actions can Balls respond to?
• I actually wonder if Ball is multiple classes,
  inheriting from the other.
• What might these be?

5
Refactoring Ball into three classes

• Ball.java
• Knows color, position, size, etc (very similar to
  the Circle.java class you are writing in HW6)
• MoveableBall.java
• Extends Ball
• Is responsible for all actions pertaining to
  motion
• BoundedBall.java
• Worries about staying in bounds
• (Version 4)