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Update 'README.md'

nhu313 6 년 전
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 ### Building a basic `PhoneBook` class
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-<img src = "https://git.zipcode.rocks/Cohort4.2/CR-MicroLabs-Composition-PhoneBook/raw/branch/master/PhoneBookUML.png">
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 * Create a `PhoneBook` class that holds names and phone numbers.
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 * Your PhoneBook class should have the following method
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+    * hasEntry(String name)
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+        * given a name, return true if there is an entry with that name, false otherwise
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 	* `add(String name, String phoneNumber)`
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 		* adds an entry to the composite associate data type
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-	* `remove(String name)`
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-		* removes an entry to the composite associate data type
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 	* `lookup(String name)`
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 		* returns a phone number for the respective input `name`
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-
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+	* `remove(String name)`
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+		* removes an entry to the composite associate data type
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 	* `reverseLookup(String phoneNumber)`
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 		* returns a name for the respective input `phoneNumber`
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-	* `toString()`
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+	* `listNamesAndNumbers()`
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 		* return a human-readable list of all entries (names and phone numbers) in alphabetical order.
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 		* Format should be `[name] [phone number]`
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 		   PhoneBook phoneBook = new PhoneBook();
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 		   phoneBook.add("Zebra", "111-222-333");
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 		   phoneBook.add("Dog", "222-444-4444");
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-		   phoneBook.display();
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+		   phoneBook.listNamesAndNumbers();
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 		   ```
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 	   * Sample Output