1. When should methods of a class use the access modifier private? 2. The class CupDispenser has a private data field, numberOfCups, which tracks the number of cups currently in the dispenser. Define...

1. When should methods of a class use the access modifier private?

2. The class CupDispenser has a private data field, numberOfCups, which tracks the number of cups currently in the dispenser. Define the method isEmpty for this class. The method should return true if a CupDispenser object contains no cups, or false otherwise.