Thread: Need help to complete my assignment.

This is what I have so far. Below are the requirements
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:
1.Design and implement a stringed musical instrument class using the following guidelines:

a.Data fields for your instrument 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.

b. A constructor method that set the tuned and currently playing fields to false.

c.Other methods 1) to tune the instrument, 2) to start the instrument playing, and 3) to stop the instrument from playing.

d.Other methods as you see fit (Add at least one unique method).

2.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.

3.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.");
}

4.Write the output from your Instrument class methods to a text file that a user entered from the command line arguments (e.g. java Mynamep3tst myfilename.txt). This allows your program to accept filenames from the user via a command line argument.

5.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, and e) Stop playing your instruments. (Hint: Arrays and Loops will make your job easier and result in more efficient code!)

6.Your programs should compile and run without errors.

7.Be sure to test your program carefully. Provide a list of comprehensive test cases used to validate your application and include these test cases in your word document containing your UML diagrams and descriptions. Similar to Project 1, your test data can be shown in a table that includes input data, expected output, actual output and pass/fail results from the test.

This is what I have so far

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Formatter;







public class Violin {




//Class Violin constructor

public Violin()

{

tunedViolin = false;

playViolin = false;

}



//Class Violin methods

public boolean setTuneViolin()

{

tunedViolin = true;

return tunedViolin;

}



public boolean setViolin()

{

playViolin = true;

return playViolin;

}



public void playViolin(int choice) throws IOException //throw exception to append file

{

//true = append file

FileWriter writeFile = new FileWriter("myText.text", true);

PrintWriter outputFile = new PrintWriter(writeFile);



//set array limit

int limit = stringArray.length;



switch (choice)

{

case 1:

//output violin number in console and external file

String tuned1 = "Violin 1 is Tuned.";

String play1 = "Playing Violin 1 strings:";

System.out.println(tuned1);

System.out.println(play1);

outputFile.println(tuned1);

outputFile.println(play1);



//loop through array

for(int index = 0; index < limit ; index++)

{

System.out.println(stringArray[index]);

outputFile.println(stringArray[index]);

}



break;



case 2:

//output violin number in console and external file

String tuned2 = "Violin 2 is Tuned.";

String play2 = "Playing Violin 2 strings:";

System.out.println(tuned2);

System.out.println(play2);

outputFile.println(tuned2);

outputFile.println(play2);



//loop through array

for(int index = 3; index >= 0; index--)

{

System.out.println(stringArray[index]);

outputFile.println(stringArray[index]);

}



break;



case 3:

//output violin number in console and external file

String tuned3 = "Violin 3 is Tuned.";

String play3 = "Playing Violin 3 strings:";

System.out.println(tuned3);

System.out.println(play3);

outputFile.println(tuned3);

outputFile.println(play3);



//loop through array

for(int index = 0; index < limit; index+=2)

{

System.out.println(stringArray[index]);

outputFile.println(stringArray[index]);

}



break;



case 4:

//output violin number in console and external file

String tuned4 = "Violin 4 is Tuned.";

String play4 = "Playing Violin 4 strings:";

System.out.println(tuned4);

System.out.println(play4);

outputFile.println(tuned4);

outputFile.println(play4);



//access array

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);

System.out.println(stringArray[3]);

outputFile.println(stringArray[3]);

System.out.println(stringArray[1]);

outputFile.println(stringArray[1]);

System.out.println(stringArray[2]);

outputFile.println(stringArray[2]);



break;



case 5:

//output violin number in console and external file

String tuned5 = "Violin 5 is Tuned.";

String play5 = "Playing Violin 5 strings:";

System.out.println(tuned5);

System.out.println(play5);

outputFile.println(tuned5);

outputFile.println(play5);



//access array

System.out.println(stringArray[3]);

outputFile.println(stringArray[3]);

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);

System.out.println(stringArray[2]);

outputFile.println(stringArray[2]);



break;



case 6:

//output violin number in console and external file

String tuned6 = "Violin 6 is Tuned.";

String play6 = "Playing Violin 6 strings:";

System.out.println(tuned6);

System.out.println(play6);

outputFile.println(tuned6);

outputFile.println(play6);



//access array

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);



break;



case 7:

//output violin number in console and external file

String tuned7 = "Violin 7 is Tuned.";

String play7 = "Playing Violin 7 strings:";

System.out.println(tuned7);

System.out.println(play7);

outputFile.println(tuned7);

outputFile.println(play7);



//loop through array

for(int index = 0; index < limit ; index++)

{

//loop through array

for(int index1 = 0; index1 < limit ; index1++)

{

System.out.println(stringArray[index1]);

outputFile.println(stringArray[index1]);

}

}



break;



case 8:

//output violin number in console and external file

String tuned8 = "Violin 8 is Tuned.";

String play8 = "Playing Violin 8 strings:";

System.out.println(tuned8);

System.out.println(play8);

outputFile.println(tuned8);

outputFile.println(play8);



//access array

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);

System.out.println(stringArray[1]);

outputFile.println(stringArray[1]);

System.out.println(stringArray[3]);

outputFile.println(stringArray[3]);



break;



case 9:

//output violin number in console and external file

String tuned9 = "Violin 9 is Tuned.";

String play9 = "Playing Violin 9 strings:";

System.out.println(tuned9);

System.out.println(play9);

outputFile.println(tuned9);

outputFile.println(play9);



//access array

System.out.println(stringArray[0]);

outputFile.println(stringArray[0]);



break;



case 10:

//output violin number in console and external file

String tuned10 = "Violin 10 is Tuned.";

String play10 = "Playing Violin 10 strings:";

System.out.println(tuned10);

System.out.println(play10);

outputFile.println(tuned10);

outputFile.println(play10);



//access array

System.out.println(stringArray[3]);

outputFile.println(stringArray[3]);

break;



}

//close file

outputFile.close();





//loop through array



}



public boolean stopViolinPlay()

{

playViolin = false;

return playViolin;

}





//Class Violin attributes

private int strings;

private boolean tunedViolin;

private boolean playViolin;

private String stringArray[] = {"E", "A", "D","G"};//Violin array

private Formatter x; //variable use to create file





}

How should I stop the violin to play

You're asking about a "mutator" or "setter" method, one that sets the value of the boolean playViolin field. The standard way to do this is to create a public method that allows outside classes to set the value of this field:

public void setPlayViolin(boolean play) { // I'll let you decide what to put in here }

On an un-related note, consider editing your original post and adding [code] [/code] tags around your code so that it will retain its formatting and be readable by us.

For example here's your program reposted with code tags wrapped around it (and with removal of some of your excess white-space). See how much easier it is to read?

  import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; import java.util.Formatter;   public class Violin { // Class Violin constructor public Violin() { tunedViolin = false; playViolin = false; }   // Class Violin methods public boolean setTuneViolin() { tunedViolin = true; return tunedViolin; }   public boolean setViolin() { playViolin = true; return playViolin; }   public void playViolin(int choice) throws IOException // throw exception to // append file { // true = append file FileWriter writeFile = new FileWriter("myText.text", true); PrintWriter outputFile = new PrintWriter(writeFile); // set array limit int limit = stringArray.length; switch (choice) { case 1: // output violin number in console and external file String tuned1 = "Violin 1 is Tuned."; String play1 = "Playing Violin 1 strings:"; System.out.println(tuned1); System.out.println(play1); outputFile.println(tuned1); outputFile.println(play1); // loop through array for (int index = 0; index < limit; index++) { System.out.println(stringArray[index]); outputFile.println(stringArray[index]); } break; case 2: // output violin number in console and external file String tuned2 = "Violin 2 is Tuned."; String play2 = "Playing Violin 2 strings:"; System.out.println(tuned2); System.out.println(play2); outputFile.println(tuned2); outputFile.println(play2); // loop through array for (int index = 3; index >= 0; index--) { System.out.println(stringArray[index]); outputFile.println(stringArray[index]); } break; case 3: // output violin number in console and external file String tuned3 = "Violin 3 is Tuned."; String play3 = "Playing Violin 3 strings:"; System.out.println(tuned3); System.out.println(play3); outputFile.println(tuned3); outputFile.println(play3); // loop through array for (int index = 0; index < limit; index += 2) { System.out.println(stringArray[index]); outputFile.println(stringArray[index]); } break; case 4: // output violin number in console and external file String tuned4 = "Violin 4 is Tuned."; String play4 = "Playing Violin 4 strings:"; System.out.println(tuned4); System.out.println(play4); outputFile.println(tuned4); outputFile.println(play4); // access array System.out.println(stringArray[0]); outputFile.println(stringArray[0]); System.out.println(stringArray[3]); outputFile.println(stringArray[3]); System.out.println(stringArray[1]); outputFile.println(stringArray[1]); System.out.println(stringArray[2]); outputFile.println(stringArray[2]); break; case 5: // output violin number in console and external file String tuned5 = "Violin 5 is Tuned."; String play5 = "Playing Violin 5 strings:"; System.out.println(tuned5); System.out.println(play5); outputFile.println(tuned5); outputFile.println(play5); // access array System.out.println(stringArray[3]); outputFile.println(stringArray[3]); System.out.println(stringArray[0]); outputFile.println(stringArray[0]); System.out.println(stringArray[2]); outputFile.println(stringArray[2]); break; case 6: // output violin number in console and external file String tuned6 = "Violin 6 is Tuned."; String play6 = "Playing Violin 6 strings:"; System.out.println(tuned6); System.out.println(play6); outputFile.println(tuned6); outputFile.println(play6); // access array System.out.println(stringArray[0]); outputFile.println(stringArray[0]); break; case 7: // output violin number in console and external file String tuned7 = "Violin 7 is Tuned."; String play7 = "Playing Violin 7 strings:"; System.out.println(tuned7); System.out.println(play7); outputFile.println(tuned7); outputFile.println(play7); // loop through array for (int index = 0; index < limit; index++) { // loop through array for (int index1 = 0; index1 < limit; index1++) { System.out.println(stringArray[index1]); outputFile.println(stringArray[index1]); } } break; case 8: // output violin number in console and external file String tuned8 = "Violin 8 is Tuned."; String play8 = "Playing Violin 8 strings:"; System.out.println(tuned8); System.out.println(play8); outputFile.println(tuned8); outputFile.println(play8); // access array System.out.println(stringArray[0]); outputFile.println(stringArray[0]); System.out.println(stringArray[0]); outputFile.println(stringArray[0]); System.out.println(stringArray[1]); outputFile.println(stringArray[1]); System.out.println(stringArray[3]); outputFile.println(stringArray[3]); break; case 9: // output violin number in console and external file String tuned9 = "Violin 9 is Tuned."; String play9 = "Playing Violin 9 strings:"; System.out.println(tuned9); System.out.println(play9); outputFile.println(tuned9); outputFile.println(play9); // access array System.out.println(stringArray[0]); outputFile.println(stringArray[0]); break; case 10: // output violin number in console and external file String tuned10 = "Violin 10 is Tuned."; String play10 = "Playing Violin 10 strings:"; System.out.println(tuned10); System.out.println(play10); outputFile.println(tuned10); outputFile.println(play10); // access array System.out.println(stringArray[3]); outputFile.println(stringArray[3]); break; } // close file outputFile.close(); // loop through array }   public boolean stopViolinPlay() { playViolin = false; return playViolin; }   // Class Violin attributes private int strings; private boolean tunedViolin; private boolean playViolin; private String stringArray[] = { "E", "A", "D", "G" };// Violin array private Formatter x; // variable use to create file }