// add a field to specify an object that ButtonPressed() will first visit
public PurchaseButton(Economy economy, int index)
{
_economy = economy;
_index = index;
}
// add a field to specify an object that Button Pressed will visit
// replace the following default constructor with a constructor that takes
// an object to be set to the above field
public CoinReturnButton(Economy economy)
{
_economy = economy;
}
// rewrite the following constructor with a constructor that takes an object
// to be set to the above field
public CoinInserter(Economy economy, int index)
{
_index = index;
_economy = economy;
}
