1. Implement the class PiggyBank, as described in the previous project. Use a bag to hold the Coin objects. This bag belongs to the class BagOfCoins, which is like BagOfStrings but uses Coin instead...

1. Implement the class PiggyBank, as described in the previous project. Use a bag to hold the Coin objects. This bag belongs to the class BagOfCoins, which is like BagOfStrings but uses Coin instead of String as the data type of the objects it contains.

2. Repeat the previous project, but use an array instead of a bag to hold the Coin objects.