Write a Java program that uses a TreeMap for a phone directory that holds a list of names with a phone number for each name. Note the following:Both key and value in the TreeMap are of type String. The key represents a name and the value represents the associated phone number.Constructor should create an initially empty directory.Write a method to find the number associated with a given name.Write a method to associate a given name with a given phone number. If the name already exists in the phone directory, then the new number replaces the old one. Otherwise, a new name/number pair is added. The name and number should both be non-null. An IllegalArgumentException is thrown if this is not the case.Write a method to display the contents of the phone directory.Write a test class with a main method to test the phone directory class.

The objective of the question is to create a phone directory using TreeMap in Java. TreeMap is a…

Answered: Write a Java program that uses a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a Java program that uses a TreeMap for a phone directory that holds a list of names with a phone number for each name. Note the following:

Both key and value in the TreeMap are of type String. The key represents a name and the value represents the associated phone number.
Constructor should create an initially empty directory.
Write a method to find the number associated with a given name.
Write a method to associate a given name with a given phone number. If the name already exists in the phone directory, then the new number replaces the old one. Otherwise, a new name/number pair is added. The name and number should both be non-null. An IllegalArgumentException is thrown if this is not the case.
Write a method to display the contents of the phone directory.
Write a test class with a main method to test the phone directory class.

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