Coins Assignment

We are going to create three classes that will resemble the following UML:

When interfacePurse is run it will create the following output (input in red):

How many cents is the coin worth? 10
   What year is on the coin? 1987
   Do you want to stop? (y/n) n
   How many cents is the coin worth? 100
   What year is on the coin? 2000
   Do you want to stop? (y/n) y
The total value in the purse is 110 cents.
   This is in the purse: 
   * a dime with a Bluenose on it, minted in 1987
   * a loonie with a loon on it, minted in 2000

1. Start with the coin class.

Use the comments to fill in the class.

public class coin
{
   private int cvalue;
   private int cyear;
   public coin (int v, int y)
   {
   //v is the value of the coin, y is the year
   //assign them to their instance variables
   }
   public int year ()
   {
   //returns the year
   }
   public int value ()
   {
   //returns the value of the coin
   }
   public String name ()
   {
   //depending on the value of the coin, 
   //return penny, nickel, dime, quarter, loonie, twoonie
   }
   
   public String animal ()
   {
   //depending on the value of the coin,
   //return maple leaf, beaver, Bluenose, caribou, loon, polar bear
   }
}

2. Code the changePurse class.

Again, follow the comments and make sure that you compile it!

public class changePurse
{
   private coin coins [] = new coin [25];
   private int size;
   public changePurse ()
   {
   //set the size to be 0
   }
   public boolean isFull ()
   {
   //if the size is less than 25, return false
   // because the purse isn't full
   }
   public void addCoin (int value, int year)
   {
   if (!isFull ())
   {
   coins [size] = new coin (value, year);
   size++;
   }
   }
   public int totalValue ()
   {
   //loop through the array of coins and total the values
   //return the total value
   }
   public void printContents ()
   { //use methods from the coin class to print out lines like:
   //* a dime with a Bluenose on it, minted in 1987
   }
}

3. Save the interfacePurse class: 

public class interfacePurse
{
   public static void main (String args [])
   {
   changePurse mine = new changePurse ();
   String quit = "n";
   while (quit.equals ("n"))
   {
   int value = IBIO.inputInt ("How many cents is the coin worth? ");
   int year = IBIO.inputInt ("What year is on the coin? ");
   mine.addCoin (value, year);
   quit = IBIO.inputString ("Do you want to stop? (y/n) ");
   }
   System.out.println ();
   System.out.println ("The total value in the purse is " + mine.totalValue    () + " cents.");
   System.out.println ("This is in the purse: ");
   mine.printContents ();
   }
}

4. Modify the interfacePurse class