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Answers to Questions and Exercises: Enum Types

Questions

1. Question: True or false: an Enum type can be a subclass of java.lang.String.

   Answer: False. All enums implicitly extend java.lang.Enum. Because a class can only extend one parent, the Java language does not support multiple inheritance of state, and therefore an enum cannot extend anything else.

Exercises

1. Exercise: Rewrite the class Card from the exercise in Questions and Exercises: Classes so that it represents the rank and suit of a card with enum types.

   Answer: See Card3.java, Suit.java, and Rank.java.

2. Exercise: Rewrite the Deck class.

   Answer: See Deck3.java.