Java

OOP GUIDE / WORK

PRISM CLASS

Topics

• Simple classes (instance variables, constructors, methods)

TASK – PART 1 – SETUP

Copy and paste the following incomplete class into your IDE:

public class Prism

{

public double width;

public double height;

public double depth;

public Prism(double width, double height, double depth)

{

//more here

}

public Prism()

{

//more here

}

}

TASK – PART 2 – COMPLETE THE CLASS

Make the following completions/additions:

a) Write the statements required to implement the first constructor.

b) Write the statements required to implement the 2^nd constructor. It should give random values between 0 and 10 for each length.

c) Write a method called volume that calculates and returns the volume of the Prism object.

d) Write a method called maxSide that returns the length of the side with the maximum length. For example, if a prism has a width of 8, a height of 6 and a depth of 9, then this method will return 9.

e) Write a toString() method that returns a String of the form:

[W8.2 x H8.1 x D9.2]

TASK – PART 3 – TESTING THE CLASS

a) Create a tester class with a main function.

b) Write a statement needed to create a Prism with constructor #1. Output the object to the screen (using toString()).

c) Write a statement needed to create a Prism with constructor #2. Output the object to the screen (using toString()).

d) Test both the volume method and the maxSide method.