Repetition Patterns -- Practice




public class Coin      // class has no modifier methods (is "immutable")
{
    public Coin(double aValue, String aName) { . . . }
    public double getValue() { . . . }
    . . .
}




public class CoinArray
{
    private Coin[] A;    // internal representation is an array


    /** Constructs an array of coins. **/
    CoinArray(Coin[] inputArray)
    {
        // Code to construct and initialize A from inputArray is missing!










    }


    /** Sums the values in the array. **/
    public double sum()
    {
        // Code to calculate the sum of the coin values in A is missing!










    }


    /** Determines whether a given value is in the array.
     *      @return true if val is in the array; false otherwise
     **/
    public boolean contains(double coinValue)
    {
        // Code to determine whether there is a coin with the
        // specified value in array A.














    }


    /** Finds the maximum coin value in the array.
     **/
    public double maxValue()
    {
        // Code to find maximum value in the array is missing!














    }

}



public class CoinCollection
{
    private ArrayList aList;    // internal representation is an ArrayList


    /** Constructs an empty coin collection. **/
    CoinCollection()
    {
        // Code to construct empty collection is missing!




    }


    /** Adds a coin to the collection. **/
    void add(Coin coin)
    {
        // Code to add a coin to the collection is missing!




    }


    /** Sums the values in the collection. **/
    public double sum()
    {
        // Code to calculate the sum of the coin values in aList is missing!















    }


    /** Determines whether a given value is in the array.
     *      @return true if val is in the array; false otherwise
     **/
    public boolean contains(double coinValue)
    {
        // Code to determine whether there is a coin with the
        // specified value in the collection.











    }


    /** Finds the maximum coin value in the array.
     **/
    public double maxValue()
    {
        // Code to find maximum value in the collection is missing!















    }

}