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Update 'README.md'

Kristofer Younger 6 年 前
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 ![PhoneBookDesign](./PhoneBookUML.png)
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+In this diagram, C stands for Class, f stnads for field, and m stands for method.
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+So, it can give you a specification for the class and the things it needs to do.
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 * Create a `PhoneBook` class that holds names and phone numbers.
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 * You can use an [associative data type](https://en.wikipedia.org/wiki/Associative_array) (one which stores items as keys paired with values).
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-* **Hint:** You should use a sorted map.
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+* **Hint:** You should use a sorted map from the java standard library.
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 * Your PhoneBook class should have the following method