Objects and Classes
CSC 140

Topics

• Analysis of the PlayBalloon and Balloon classes
• Classes and Objects
• Constructors and instantiating objects with the new keyword
• public and private and the concept of encapsulation
• Garbage collection
• Every object should paint itself on the screen.
• Method overloading
• this
• null
• File and class organization

In-Class Lab (2 points shared with January 30th)

Add the Left and Right Buttons, as seen on page 171 of the text, to the PlayBalloon Applet, and make them work properly.  Also, add the private float calcArea() method, as seen on page 152 of the text, to the Balloon class.  Have the Balloon print its area under itself inside public void display(Graphics g).

Readings

Chapter 9.  Read everything carefully except the section on static.  We will cover static later.  Almost everything in this chapter is important.  I thoroughly disagree with the author's statement in the section on Classes and files, page 162, that both of his presented alternatives for file organization are equally satisfactory.  For this class, always put every class into its own file.  

	Office:  B132	Phone:  353-2250	sbadman@parkland.edu