Lab 19

Apple Maker

Objective:

Write a program that creates a class Apple and a tester to make sure the Apple class is crisp and delicious.

First create a class called Apple

• Write a class file called Apple that DOES NOT HAVE a main method
• Some of the attributes of Apple are
• Type: A string that describes the apple.  It may only be of these following types
• Red Delicious
• Golden Delicious
• Gala
• Granny Smith
• Weight: A decimal value representing the apple’s weight in kilograms.  The weight must be between 0kg and 2kg
• Price: The price per apple.  This must be a non-negative decimal value.
• Create the following Constructors
• Default – sets everything to default values and has no parameters
• Accessors and Mutators for each variable
• MAKE SURE THE MUTATORS CHECK FOR VALID VALUES!
• Create the following Methods
• toString: Returns a string with all of the instance variable values
• Ex: “Name: <<apple’s name>> Weight <<apple’s weight>> Price <<apple’s price>>”
• equals: This method returns a Boolean and takes in another instance of an apple.  It returns true if all of the instance variables equal the instance variables in the other apple

Finally create a class called AppleTester

• This class DOES HAVE a main method
• Create at least 3 different types of apples
• Test if the accessors, mutators, and other methods work as intended.

Example Dialog:

Welcome to the apple tester

Creating a default apple

Printing the default apple’s values

Name: Gala Weight: 0.5 Price: 0.89

Creating another apple

Setting the new apple’s values to the following valid values “Granny Smith” 0.75 0.99

Printing the new apple’s values

Name: Granny Smith Weight: 0.75 Price:0.99

Creating another apple

Setting the new apple’s values to the following invalid values “iPad” 2.5 -200

Invalid Name

Invalid Weight

Invalid Price

Printing the apple’s values which should have not changed from the default values

Name: Gala Weight: 0.5 Price 0.89

Lab Report Questions:

1. In your own words describe what a class is used for.
2. In your own words describe encapsulation as it relates to object oriented programming

Finally:

Upload ALL java files to the dropbox