When you add a contact to your phone, it automatically sorts those names alphabetically. In this exercise, we are going to create a phonebook that automatically sorts everytime a new number is added to the phonebook. A PhoneNumber class has been created already that has the instance variables name and number. Your job is to create the PhoneBook class that will store an ArrayList of PhoneNumbers. The PhoneBook class does not have a constructor - it only contains an ArrayList that can store the individual phone numbers that are added to it. There should be three methods in the PhoneBook class: addNumber- This method takes a PhoneNumber and adds it to the directory. Once the number has been added, the sort method is called on the directory to sort that new address into the phone book. sort- This method sorts the directory in alphabetical order A-Z. a. Remember that in order to compare Strings, we can use the compareTo() method. This returns an integer that indicates whether a String’s characters are higher or lower in order than the other String. If the value is -, then it means the String is alphabetically higher. For example "S".compareTo("T") will return -1, indicating that S is 1 spot higher than T. Use this to help sort your phonebook. b. If the phonebook sorts after each add, then the list will be sorted completely except for new entry - which sorting method should you use? printPhoneBook - This prints each name in the directory on the console. Use this to help you debug your program!
When you add a contact to your phone, it automatically sorts those names alphabetically. In this exercise, we are going to create a phonebook that automatically sorts everytime a new number is added to the phonebook.
A PhoneNumber class has been created already that has the instance variables name and number. Your job is to create the PhoneBook class that will store an ArrayList of PhoneNumbers.
The PhoneBook class does not have a constructor - it only contains an ArrayList that can store the individual phone numbers that are added to it.
There should be three methods in the PhoneBook class:
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addNumber- This method takes a PhoneNumber and adds it to the directory. Once the number has been added, the sort method is called on the directory to sort that new address into the phone book.
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sort- This method sorts the directory in alphabetical order A-Z.
a. Remember that in order to compare Strings, we can use the compareTo() method. This returns an integer that indicates whether a String’s characters are higher or lower in order than the other String. If the value is -, then it means the String is alphabetically higher. For example "S".compareTo("T") will return -1, indicating that S is 1 spot higher than T. Use this to help sort your phonebook.
b. If the phonebook sorts after each add, then the list will be sorted completely except for new entry - which sorting method should you use? -
printPhoneBook - This prints each name in the directory on the console. Use this to help you debug your program!
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