wld really appreciate help with this assignment im in a real fix
Write a complete address book maintenance application. The user of the program has three options: add new person, delete a person and modify the data of a person.
You have to decide how to allow the user to enter the values for a new person, and the other options.
You must use files in order to save and read the data.
Use the AddressBook class provided below.
the address book class
/*
Introduction to OOP with Java 4th Ed, McGraw-Hill
Wu/Otani
Chapter 10 Sample Program: Address Book Maintenance
File: AddressBook.java
*/
/**
* This class is designed to manage an address book that contains
* Person objects. The user can specify the size of the address book
* when it is created. If no size is specified, then the default size
* is set to 25 Person objects.
*
* @author Dr. Caffeine
*
*/
class AddressBook { //Step 4: Implement the delete method
//--------------------------------
// Data Members
//--------------------------------
/**
* Default size of the array
*/
private static final int DEFAULT_SIZE = 25;
/**
* Constant for signaling an unsuccessful search
*/
private static final int NOT_FOUND = -1;
/**
* The array of Person objects
*/
private Person[] entry;
/**
* The number of elements in the <code>entry</code> array,
* which is also the position to add the next Person object
*/
private int count;
//--------------------------------
// Constructors
//--------------------------------
/**
* Default constructor.
* Creates an address book of size 25.
*/
public AddressBook( ) {
this( DEFAULT_SIZE );
}
/**
* Creates an address book with the designated size.
*
* @param size the size of this address book.
*/
public AddressBook( int size ){
if (size <= 0 ) {
throw new IllegalArgumentException("Size must be positive.");
}
entry = new Person[size];
//System.out.println("Array of "+ size + " is created."); //TEMP
}
//-------------------------------------------------
// Public Methods:
//
// void add ( Person )
// void delete ( String )
// Person search ( String )
//
//------------------------------------------------
/**
* Adds a new Person to this address book.
* If the overflow occurs, the array size
* is increased by 50 percent.
*
* @param newPerson a new Person object to add
*/
public void add( Person newPerson ) {
assert count >= 0 && count <= entry.length;
if (count == entry.length) { //no more space left,
enlarge( ); //create a new larger array
}
//at this point, entry refers to a new larger array
entry[count] = newPerson;
count++;
}
/**
* Deletes the Person whose name is 'searchName'.
*
* @param searchName the name of a Person to delete
*
* @return true if removed successfully; false otherwise
*/
public boolean delete( String searchName )
{
boolean status;
int loc;
loc = findIndex( searchName );
if (loc == NOT_FOUND) {
status = false;
} else { //found, pack the hole
entry[loc] = entry[count-1];
status = true;
count--; //decrement count,
//since we now have one less element
assert count >= 0 && count <= entry.length;
}
return status;
}
/**
* Searches this address book for a Person
* whose name is <code>searchName</code>.
*
* @param searchName the name to search
*
* @return a Person object if found; otherwise null
*/
public Person search( String searchName ) {
Person foundPerson;
int loc = 0;
while ( loc < count &&
!searchName.equals( entry[loc].getName() ) ) {
loc++;
}
if (loc == count) {
foundPerson = null;
} else {
foundPerson = entry[loc];
}
return foundPerson;
}
//-------------------------------------------------
// Private Methods:
//
// void enlarge ( )
//
//------------------------------------------------
/**
* Enlarges the size of <code>entry</code> array to
* eliminate the overflow condition. The new array
* is 50 percent larger than the current array.
*/
private void enlarge( ) {
//create a new array whose size is 150% of
//the current array
int newLength = (int) (1.5 * entry.length);
Person[] temp = new Person[newLength];
//now copy the data to the new array
for (int i = 0; i < entry.length; i++) {
temp[i] = entry[i];
}
//finally set the variable entry to point to the new array
entry = temp;
System.out.println("Inside the method enlarge"); //TEMP
System.out.println("Size of a new array: " + entry.length); //TEMP
}
/**
* Finds the index in the array where <code>searchName</code>
* is the name of a person to locate.
*
* @param searchName the name of person to find
*
* @return the index of the found Person in the array; NOT_FOUND
* if the searched person is not found
*/
private int findIndex( String searchName ) {
int loc = 0;
while ( loc < count &&
!searchName.equals( entry[loc].getName() ) ) {
loc++;
}
if (loc == count) {
loc = NOT_FOUND;
}
return loc;
}
}
please mail me at
push_thetempo@hotmail.com 
![Nairaland [Nigerian Forum] Home](http://www.nairaland.com/Themes/default/images/english/home.gif)
Author
(Good luck)
