CpSc 215L, Section 002 Fall 2008
Lab #6:
Generics and Privacy Leaks
Sravanthi Dandamudi and Hao Jiang
September 30th, 2008
1 Objectives
The purpose of this lab is to give you some experience working with generics in Java as well as using best
practices to avoid “privacy leak”.
2 Lab Description
For this lab, you are required to have the Stack interface as well as one of your interface implementations.
The lab is divided into two parts. The first part should be done collab oratively in pairs. The second part
should be done individually.
2.1 Part One
For the collaborative part, you are required to implement the class Ink which includes the following member
variables:
•quantity
•color
Additionally, you are required to create the class Pen that has the following member variables:
•ink, which is an object of the class Ink.
•length
•color
For both classes, you are required to use the Color enumeration covered in the code handouts provided in
class. For the Ink class, provide a safe copy constructor that takes an object of the same class as argument.
For the Pen class, provide a safe parameterized constructor that takes the different member variables as
arguments. For both classes provided safe getter and setter methods for the different member variables.
To test your implementation, in your main method do the following following:
•Create an object of the class Ink.
•Create an object of class Pen passing the ink object as one of the parameters to the constructor.
•Change the quantity of the ink object.
•Get the quantity of the ink member variable in the pen object.
•Get the quantity of the ink object.
•Are they the same value? Is your implementation safe?
Note: Make sure all your member variables are private.
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