Computer Science 523
Advanced Programming

Summer 2014, The College of Saint Rose

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Agenda

• Announcements
• Lab 1: Java Basics recap
• Lab 2: Lottery Simulator recap
• General advice on the process of programming
  • If you can't understand what you are trying to get Java to do, you need to clarify that understanding before attempting to write any code.
  • Never declare a variable or write a line of code unless you know why you're doing so.
• More on methods
• Custom classes and object-oriented programming
• In-class Exercise 3 - (5 lecture assignment points) due before the end of class.

  We will work together to develop a Java program that will include a class to represent a circle and another class that will create and work with some circles. You may work alone or with a partner on this exercise in class.

  Our circles will not actually be drawn on the screen, but we will store information that could be used to do so. We will maintain 3 pieces of information about the circles:

  • its center coordinates
  • its radius
  • its color

  We will develop a class called Circle which stores the above data, and includes methods to create a circle, query its center, query its radius, query its color, query its top, bottom, left end right edges, query its diameter, and obtain a String description of the circle. Additional methods will allow the center, radius, diameter, and color to be modified.

  We will also develop a class called CircleMaker that we will use to test the constructors and other methods of the Circle class.

  Please submit an archive file that contains your Java files for this program in Submission Box under "InClass3" before you leave class.

• Lab 3: Custom Classes out

Terminology

• field
• method
• object-oriented programming
• classes
• objects
• encapsulation
• instance variable
• constructor
• accessor method
• mutator method
• class variable

Examples

• RatiosNoClass
• Ratios
• PurchaseTracker