Stringbuffer | Computer Science homework help

  

1) Explain the difference between the String class and the StringBuffer class. Describe when you would use one over the other. Show example code of each of them.
 

2) Design and implement a Java class to represent a cube class. The class should contain a constructor, appropriate data fields and methods to return the volume of the cube, and the surface area of the cube.
 

3) 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.

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