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Project 1: PrimesFactory.java

If you're new to ArrayLists, you may want to run ArrayListDemo.java .

Design a class called PrimesFactory. This class will calculate the prime factorization of any number, print a list of all prime numbers as well as state whether or not a given number is a prime number. Source Code

• public boolean isPrime(int num)
  • This method returns true if num is a prime number.
• public ArrayList<Integer> getPrimeFactors(int num)
  • This method returns an ArrayList full of the prime factors of num
• public String listPrimesUpTo(int num)
  • This method returns a comma separated String of all prime numbers less than num
    

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Project 2: Bank This class will implement some of the basic functionality of a bank.

• Instance Variables
  • An ArrayList to store names as Striings
  • An Arraylist storing bank accounts (ints)
  • An ArrayList storing balances (doubles
• Constructors
  • default constructor
  • A constructor with 1 paramater. This parameter is a list of names.
• Methods
  • Accessors
    • boolean hasAcount(String name) //@returns true if name has a bank account
    • double getBalance(String name)//@returns the balance for name's account.
    • double getBalance(int accountNumber)//@returns the balance as so cited with that accountNumber
    • String getName(int accountNumber)//@ returns the name associated with that accountNumber
• Mutators
  • void addAccount(String name, int number, double balance) adds an account
  • void setBalance(int accountNumber, double balance) sets the accountNumber's balance equal to balance.
  • void changeName(int accountNumber) changes the name associated with accountNumber

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Project 3: Class Roster: This class will implement the functionality of all roster for school. Here is a grading rubric.

• Instance Variables
  • a final int MAX_NUM representing the maximum number of students allowed on the roster
  • an ArrayList storing names as Strings
  • an Arraylist stores student id's as Integers
• Constructors
  • a default constructor should initialize the list to empty strings
  • a single parameter constructor that takes an ArrayList<String>
  • Both constructors should initialize the instance variables
• Methods
• Accessors
  • boolean containsStudent(String studentName) //@returns true if studentName is in roster
  • String retrieveById(int id) //@ returns Student name associated with id
  • int retrieveId(String Student) //@returns id associated with String Student
• Mutators:
  • boolean addStudent(String studentName, int studentId) ;//adds student name and id to end of roster
    • This method should not allow a student to be added if the name or the studentId is already in the roster. Also, make sure that the total number of students does not exceed MAX_NUM. Hint: Make user of the containsStudent() method
  • boolean removeStudent(int id) // removes student from roster based on id. Make sure that you maintain the integrity of the parallel ArrayLists.
  • boolean removeStudent(String name) //removes student based on name. Make sure that you maintain the integrity of the parallel ArrayLists.

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• Project 4: PlayList Project: This class stores lists of songs and will require e ArrayLists. One is an ArrayList of Strings that represent the individual track titles of all songs in a PlayList ; the other is a parallel ArrayList called Stars which represents how many 'stars' you give each song(between 0 and 5 stars). It should also have an instance variable that represents the name of the PlayList and an instance variable final int MAX_NUMBER_SONGS, which is pretty self descriptive (When you add the final modifier to a variable it become a constant that cannot be changed by your program). You should create accessor and mutator methods that implement the following functionality.
• Instance Variables
  • private String listName : This is the 'name' of your playList
  • private ArrayList<String> songs
  • private ArrayList<Integer> stars //how many stars each song has
  • private ArrayList<String> artists
• Constructor
  • no default constructor
  • public PlayList(String name) : There should be only 1 constructor that takes a parameter representing the name of the playList
• Mutator Methods
  • public void swap(String song1, String artist1, String song2, String artist2) // switches positions of these two
  • public void renameList(String to) //changes listName to to
  • public void clearList() //removes all items from all the lists and sets the value of listName to null
  • public boolean add(String song, String artist, int stars) //adds data if number of song is less than MAX_NUMBER_SONGS
  • public void removeSong(String song, String artist ) //removes song associated with artist
    • Note: Be careful here. You are allowed to add the same song and artist. Duplicates are allowed. Make sure your code works with duplicate song, artist in the list
  • public void removeArtist(String artist ) //removes all elements associated with artist
  • public void removeLowStars(int cutOff) //removes all elements associated with a star rating less than cutOff
  • public PlayList(String name) : There should be only 1 constructor that takes a parameter represents the name of the playList
  • ** public void sortByRating() //this rearranges the playlist so that the 5 starred elements are the first group in the list, 4 stars second ...1 stars, last
  • ** PlayList shuffle()//this returns a new PlayList in which all of the songs have been reordered randomly
• Accessor Methods
  • public String getName() //returns listName
  • public ArrayList<String> getArtist(String song) // returns an ArrayList of all musicians associated with a given song name (This could be multiple musicians)
  • public ArrayList<String> getSongs(String artist) // returns an ArrayList of all Songs associated with artist.
  • public int getStars(String artist, String song) // returns how many stars given song has
  • public int spacesLeft() //returns has many spaces are left for songs. In other words, if the list is empty it returns MAX_NUMBER_SONGS
  • public double averageRating() // returns the mean star rating for the list
  • public int numSongsByArtist(String musician) //returns a count of how many songs are associated with given musician
  • public double averageRating(String artist) // returns the mean star rating associated with artist
  • public String getMusician(String artist) // returns a comma separated list of all songs and their respective ratings associated with artist
  • public void printRating(int starRating) // prints a list of all songs and musicians whose stars have starRating.
  • public String toString() //returns an appropriate String representation of the list

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