This project focuses on demonstrating your understanding of
classes and objects. Before attempting this project, be sure you
have completed all of the reading assignments listed in the
syllabus to date, participated in the weekly conferences, and
thoroughly understand the examples throughout the chapters. The
project requirements include:
Design and implement a stringed musical instrument violin
class using the following guidelines:
Data fields for violin should include number of strings, an
array of string names representing string names (e.g. E,A,D,G), and
boolean fields to determine if the instrument is tuned, and if the
instrument is currently playing. You are welcome to add additional
data fields if you like.
A constructor method that set the tuned and currently playing
fields to false.
Other methods
1) to tune the instrument
2) to start the instrument playing
3) to stop the instrument from playing.
4) return number of strings
5) return an array of string names representing string names
(e.g. E,A,D,G)
Create a UML class diagram using a diagram tool (e.g. PPT,
Visio) of your choice. Prepare the diagrams and place them in a
word document along with a brief description of each of your
classes.
Create Java classes for your instruments. Be sure that your
code matches your design specifications and some minimal
functionality is included. For example, if you called the
violin.play() method, you should at least print that the violin is
playing. Similar functionality should be supplied when you stop
playing, tune or call any of your methods. For example:
public void playviolin() {
System.out.println("The violin is now playing.");
}
Write the output from your Instrument class methods to a text
file that a user entered from the command line arguments (e.g. java
violinOutput.txt). This allows your program to accept filenames
from the user via a command line argument.
Finally, create a Java test class that simulates using your
instrument class. In your test class be you should at a minimum: a)
Construct 10 instances of your instrument, b) tune your
instruments, c) Start playing your instrument, d) Call your unique
method such as write string numbers and names, and e) Stop playing
your instruments. (Hint: Arrays and Loops will make your job easier
and result in more efficient code!)
Your programs should compile and run without errors.
Be sure
import java.io.*;
public class Test{
public static void main(String[] args) {
String outputFile = "";
if (0 < args.length) {
outputFile = args[0];
System.out.println("This program will write output to this
file: " + outputFile + " ");
try {
File file = new File(outputFile);
PrintWriter output = new PrintWriter(outputFile);
output.println("hello"); //to check if ir prints anything
Violin[] simpleViolin = new Violin[5];
//Create 5 violin objects
for (int i = 0; i < simpleViolin.length; i++){
simpleViolin
= new Violin();
}
output.println(" Let's tune " + Violin.getNumberOfViolins() + "
violins.");
for(int i = 0; i < simpleViolin.length; i++){
output.print(i + 1);
simpleViolin.tuneOn();
}
output.println(" Now let's start playing " +
Violin.getNumberOfViolins() + " violins.");
for(int i = 0; i < simpleViolin.length; i++){
output.print(i + 1);
simpleViolin.startPlaying();
}
output.println(" It looks like " + Violin.getNumberOfViolins()
+ " violins have untuned.");
for(int i = 0; i < simpleViolin.length; i++){
output.print(i + 1);
simpleViolin.tuneOff();
}
output.println(" This music is terrible! Let's stop it!");
for(int i = 0; i < simpleViolin.length; i++){
output.print(i + 1);
simpleViolin.stopPlaying();
}
output.close();
}
catch (IOException io){
System.out.println("Sorry that file is not found " + io);
}
}//end if
}//end main
}//end Test
class Violin{
private final int numberOfStrings = 4;
private final char[] stringNames = {'E', 'A', 'D', 'G'};
private boolean isTuned = false;
private boolean isPlaying = false;
private static int numberOfViolins = 0;
private PrintWriter output;
public Violin(){
numberOfViolins++;
}
public void startPlaying() {
isPlaying = true;
System.out.println(" violin is now playing.");
}
public void stopPlaying() {
isPlaying = false;
System.out.println(" violin has stopped playing.");
}
public void tuneOn() {
isTuned = true;
System.out.println(" violin is now tuned.");
}
public void tuneOff() {
isTuned = false;
System.out.println(" violin is untuned.");
}
static int getNumberOfViolins(){
return numberOfViolins;
}
}
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