Homework 4

Homework 4
This assignment demonstrates your understanding of the String, StringBuffer, StringBuilder classes,
along with classes in the java.time package and the use of command line arguments. This homework
consists of 2 programming assignments worth 25 points each.
Before attempting this project, be sure you have completed all of the reading assignments, hands-on
labs, discussions, and assignments to date.
1. (25 points) Write a Java program the displays the State bird and flower. The program should

prompt the user to enter a State and print both the State bird and flower. The user should be
able to enter a State without worrying about case. (e.g. Users could enter Maryland, maryland,
MARYLAND or any other possible combination of lower and upper case characters. States may
also contain leading and trailing white spaces. Hint: Store the State information in a multidimensional array. The program should continue to prompt the user to enter a state until
None is entered. You will need to do some research to find the State birds and flowers. Here
is a sample run:
Enter a State or None to exit:
Maryland
Bird: Baltimore Oriole
Flower: Black-eyed Susan
Enter a State or None to exit:
Delaware
Bird: Blue Hen Chicken
Flower: Peach Blossom
Enter a State or None to exit:
None

2. (25 points) Design a class named Clock. The class contains private data fields for startTime and
stopTime, a no argument constructor that initializes the startTime to the current time, a method
named start() that resets the startTime to the given time, a stop() method that sets the endTime
to the given time and a getElapsedTime() method that returns the elapsed time in seconds.
Create a TestClock class to construct a Clock instance and return the elapsed time. Command
line arguments should be used to send the start and end times. You should use the java.time
classes. Here is sample run:
java TestClock 11:45:12 11:48:13
Elapsed time in seconds is: 181

Grading Rubric:
The following grading rubric will be used to determine your grade:
Attribute
Design (5 points)

Exceeds
(5 points)

Meets
(3-4 points)

Exhibits proper use of
parameters, and

Does not meet
(0-2 points)

Exhibits proper use of
parameters, and
1

selection of data types
all of the time.
Employs correct and
appropriate use of
programming
structures (loops,
conditionals, classes
etc.) all of the time.

Efficient algorithms
used most of the time.