Consider the following interface: interface Something { boolean validate (int value); Classes that implement "Something" interface can validate a specific value in different behaviors within some context. For example, this interface could be useful to program a candy dispenser machine to check whether the coin inserted is a valid coin such as a quarter with a diameter of 2.426 centimeters. Also, it could be useful to check if there is any candy available to dispense. a) Write two classes "Coin" and "Available" that implements "Something" interface to serve the explained purposes. Hint: the variable "value", treated as the diameter of the coin in the "Coin" class, and treated as the number of available candies in the "Available" class. b) Explain in your own words how this exercise helped you understand polymorphism and code-reuse concepts. Consider the following interface: interface Something { boolean validate (int value); Classes that implement "Something" interface can validate a specific value in different behaviors within some context. For example, this interface could be useful to program a candy dispenser machine to check whether the coin inserted is a valid coin such as a quarter with a diameter of 2.426 centimeters. Also, it could be useful to check if there is any candy available to dispense. a) Write two classes "Coin" and "Available" that implements "Something" interface to serve the explained purposes. Hint: the variable "value", treated as the diameter of the coin in the "Coin" class, and treated as the number of available candies in the "Available" class. b) Explain in your own words how this exercise helped you understand polymorphism and code-reuse concepts.