Lab 4: Arrays

In this lab, you will practice using arrays.

A Phone Directory

Create a class called PhoneDirectory. The class should have a single instance variable that is an array of PhoneEntry where the PhoneEntry is the class you created for lab 2.

The constructor should initialize the PhoneEntry array to have 4 elements, and each element should initially be null.

Create the following methods for the PhoneDirectory class.

void add(String lastName, String firstName, String phoneNumber)
Create a new PhoneEntry with the appropriate values and place it in the first element of the array that has value null. If every element is filled, do nothing
PhoneEntry get(int index)
Return the entry stored in the array at the given index.
PhoneEntry get(String firstName, String lastName)
Return the first entry in the array with the matching first and last name. If no such entry is found, return null.
PhoneEntry get(String number)
Return the first entry in the array with the matching phone number. If no such entry is found, return null.
int getIndex(PhoneEntry entry)
Return the index of entry in the array, if entry is in the array. If entry is not in the array, return -1.
Use the .equals method to compare PhoneEntrys even though you have not overridden the default .equals in the PhoneEntry class.
PhoneEntry remove(int index)
Remove the PhoneEntry stored at the given index (by setting the element stored at that value to null) and return the removed PhoneEntry.
void remove(PhoneEntry entry)
Remove the PhoneEntry entry from the array (by setting its array element to null) if entry is in the array. If entry is not in the array, do nothing. Use .equals to compare PhoneEntry instances.

When you are finished, email your code to me.