Description

This lab is based on Ch. 6 Ex. 1 & 2 of your text, Savitch & Carrano, "Java: An Introduction to Problem Solving and Programming", 5th edition.

Part 1

• a. Write a default constructor that initializes the time to 0 hours, 0 minutes
• b. Write a private method isValid(hour, minute) that returns true if the given hour and minute values are valid
• c. Write a method setTime(hour, minute) that sets the time, but ONLY if the given values are valid
• d. Write a second constructor whose function is analogous to that of the setTime method from part c

Part 2

Create a class called "TaxUtils" that will bundle together several static methods for tax computations. This class should NOT have a constructor. Its attributes are

• basicRate - the basic tax rate as a static double variable with a value of 4%
• luxuryRate - the luxury tax rate as a static double variable with a value of 10%

Its methods are

• roundToNearestPenny(price) - a private static method that returns the given price rounded to the nearest penny. For example, if the price is 12.567, the method will return 12.57
• computeCostBasic(price) - a static method that returns the given price plus the basic tax, rounded to the nearest penny
• computeCostLuxury(price) - a static method that returns the given price plus the luxury tax, rounded to the nearest penny
• setBasicRate(newRate) - a static method that changes the basic tax rate to newRate
• setLuxuryRate(newRate) - a static method that changes the luxury tax rate to newRate

HINT: See the beginning of section 6.3 in the text for a strategy that can be used to round to the nearest penny.

Part 3

Create a class called "TaxUtilsTester" that will perform some basic tests on your "TaxUtils" class. At the very LEAST, your TaxUtilsTester must do the following

• Set the basic tax rate
• Set the luxury tax rate
• Make a call to computeCostBasic using a price of your choosing and check that the correct value is returned
• Make a call to computeCostLuxury using a price of your choosing and check that the correct value is returned

Submission

Before submitting, make sure that each .java file contains a properly edited Program Header.

For this assignment you will need to create a Jar file that contains the source code for Time.java, TaxUtils.java AND TaxUtilsTester.java that you edited as part of this assignment. Follow these instructions for creating a Jar file.
The Jar file you submit must be named yourlastname_lab6.jar, where yourlastname is your last name

Submit yourlastname_lab6.jar via the UNC Blackboard System under "Assignments → Lab 6" before the deadline.

Grading

• 4 points Part 1
• 8 points Part 2
• 8 points Part 3
• 2 points Jar file submitted and named correctly
• 3 points Program Headers edited correctly