Midterm Review

• Midterm 3

– Monday 2/26/07

– Topics:

• Chapters 7 & 8

• How it works: bouncing ball program

• Timer, Mover, MoveTimer

• BorderLayout, FlowLayout, Button

• Let’s review the bouncing ball app

– BouncingBallApp

– BouncingBallPanel

– BouncingBall

– Mover

– MoveTimer

– SmartEllipse

• BouncingBallApp

– Wrapper of the BouncingBallPanel

– Doesn’t do much

• BouncingBallPanel

– implements Mover

• So there must be a move() method

– Objects contained:

• a BouncingBall

• a MoveTimer

– Important methods:

• paintComponent

• move -- has to call repaint()

• BouncingBall

– extends SmartEllipse

– Method move() – override or overload?

• Mover

– A simple interface

• Why do we need this?

• What if we don’t have this, can we still do the job? What do we need to modify?

– Specifies one method

– Can we make this into an abstract class?

• What could be a problem?

• MoveTimer

– extends javax.swing.Timer

– Concepts of inner class

• SmartEllipse

– Same thing you had before.

• Layouts

– BorderLayout, FlowLayout