this needs to be done in Java using Using Multiple Generic Data Structures – LinkedList and ArrayList
In this assignment, you will write a system to manage email address lists (ostensibly so that you could send emails to a list which has a name – which would send an email to each of the addresses in the list – although we will not actually implement sending emails. Displaying the list will simulate being able to send the emails). We will use multiple Java Generic data structures to hold the data. We could add MUCH to this program – I am providing specifications for the very basics that must be completed for this assignment to manage your time.
Basic Requirements:
- An email address (which will be defined in the EmailAddressclass) is a String. Much editing could be done on this field – but the minimum for this assignment is that it must contain at least one ‘@’ and one ‘.’ and is at least 7 chars long. I have written this class for you – it is published with this assignment.
- An email address list (EmailList class) will contain two fields – a String name of the list, and a LinkedListof EmailAddressobjects. Note – be sure to know why a LinkedList is an effective structure to use for this data.
- The Directoryclass will hold handle an ArrayList of EmailList objects. As we will need to search for EmailLists – we will want to keep these entries sorted by the name of the list.
- Main should have a menu which allows the following choices:
- the creation of a new EmailList that is added to the EmailList’s ArrayList;
- display of all the EmailLists in the ArrayList
- addition of an EmailAddress to an existing EmailList in the ArrayList
- deletion of an EmailAddress in an existing EmailList
- display a particular EmailList
- read in EmailLists from a file
- You must use these class names and the default package. Be sure to ensure you are adhering to all Object Oriented Principles as have been covered in the class. In particular, all fields MUST be declared as private. (If you don’t specify this – the default is public). Also, we will continue in this assignment to NOT use get/set methods.
- All possible error conditions must be handled. No program crashing is allowed. No System.exit() calls are allowed.
- File input hint – you should not need to use .nextLine() method….you can use .next() method – so you don’t have issues with the new line character.
- Efficiency considerations (minimum):
- Use only one Scanner object to the keyboard in your program and pass it to the methods that need it.
- Insert and search of EmailListsin Directoryclass
- Insert and delete of EmailAddresses in EmailListclass
EmailLists.txt file format:
This file contains the following format:
- An int – number of email lists contained in the file
- Then for each email list
- The name of list (containing no spaces)
- An int – number of email addresses in the list to follow
- The email addresses -
Sample file – EmailLists.txt:
5 CST8130Class 4 [email protected] [email protected] [email protected] [email protected] Friends 2 [email protected] [email protected] Family 4 [email protected] [email protected] [email protected] [email protected] Work 1 [email protected] ExtendedFamily 10 [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]
Sample:
code:
public class EmailAddress {
private String address = new String();
//***************** default constructor ******************************************
public EmailAddress() {
}
//***************** initial constructor ******************************************
public EmailAddress (String address) {
if (address.contains ("@") && address.contains(".") && address.length() >= 7)
this.address = new String (address);
}
//***************** toString **************************************************
public String toString() {
return address;
}
//***************** addAddress **************************************************
public void addAddress(Scanner in, String prompt) {
if (prompt.charAt(0) == 'y')
System.out.print ("Enter valid email address");
address = in.next();
while (!address.contains ("@") || !address.contains(".") || address.length() < 7) {
System.out.print ("Enter valid email address...must contain @ and .:");
address = in.next();
}
}
}
Homework Answers
Assign3.java
import java.util.Scanner;
import java.util.InputMismatchException;
import java.io.File;
import java.io.FileNotFoundException;
public class Assign3 {
private Scanner sc = new Scanner(System.in);
private Directory directory = new Directory();
public static void main(String[] args) {
Assign3 assign3 = new
Assign3();
assign3.menu();
}
/**
* Shows the menu, interacts with the user for menu
selection, loops till
* they exit.
*/
public void menu() {
boolean done = false;
while (!done) {
System.out.println("Enter c to create a new list");
System.out.println(" p to display all
the email lists");
System.out.println(" a to add an
entry to a list");
System.out.println(" d to delete an
entry from a list");
System.out.println(" l to display a
list");
System.out.println(" f to load lists
from file");
System.out.print(" q to quit: ");
String option = null;
while
(!sc.hasNextLine()) {
sc.next();
}
option = sc.nextLine().toLowerCase();
if
(option.equals("c")) {
createList();
} else if
(option.equals("p")) {
displayAllLists();
} else if
(option.equals("a")) {
addEntryToList();
} else if
(option.equals("d")) {
deleteEntryFromList();
} else if
(option.equals("l")) {
displaySingleList();
} else if
(option.equals("f")) {
readFile();
} else if
(option.equals("q")) {
System.out.println("Quit");
done = true;
} else {
System.out.println("Invalid option, please try
again.");
}
System.out.println();
}
}
/**
* Prompts user to enter data for a new list.
*/
private void createList() {
String name = enterName("Enter the
name of the list: ");
EmailList emailList =
findEmailList(name);
if (emailList == null) {
emailList = new
EmailList(name);
enterEmailAddress(emailList);
directory.addEmailList(emailList);
} else {
System.out.println("The EmailList with the name already
exist.");
}
}
/**
* Displays all EmailLists in the directory.
*/
private void displayAllLists() {
directory.display();
}
/**
* Prompts user to enter the name of the EmailList and
displays the list.
*/
private void displaySingleList() {
String name = enterName("Enter name
of list to display: ");
EmailList emailList =
findEmailList(name);
if (emailList != null) {
emailList.display();
} else {
System.out.println("The EmailList does not exist.");
}
}
/**
* Prompts user to enter the name of the EmailList and
adds an EmailAddress to the list.
*/
private void addEntryToList() {
String name = enterName("Enter name
of list to add to: ");
EmailList emailList =
findEmailList(name);
if (emailList != null) {
EmailAddress
emailAddress = new EmailAddress();
emailAddress.addAddress(sc, "y");
emailList.addEntry(emailAddress);
sc.nextLine();
} else {
System.out.println("The EmailList does not exist.");
}
}
/**
* Prompts user to enter the name of the EmailList and
deletes the list.
*/
private void deleteEntryFromList() {
String name = enterName("Enter name
of list to delete from: ");
EmailList emailList =
findEmailList(name);
if (emailList != null) {
int count =
emailList.size();
if (count
> 0) {
emailList.show();
int index = -1;
while (true) {
System.out.print("Enter entry
number to delete: ");
try {
index =
sc.nextInt();
sc.nextLine();
break;
} catch
(InputMismatchException ex) {
System.err.println("Please enter an integer");
sc.nextLine();
}
}
if (index >= 0 && index < count)
{
emailList.deleteEntry(index);
} else {
System.out.println("The entry
number is out of range.");
}
} else {
System.out.println("The EmailList is
empty.");
}
} else {
System.out.println("The EmailList does not exist.");
}
}
/**
* Reads in EmailLists from a file.
*/
private void readFile() {
String filename = null;
System.out.print("Enter name of file to process: ");
while (true) {
while
(!sc.hasNextLine()) {
sc.next();
}
filename = sc.nextLine().trim();
if
(!filename.equals("")) {
break;
}
}
Scanner scanner = openFile(filename);
if (scanner != null) {
// Read the line
count.
int totalLines =
0;
while
(scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.equals("")) {
try {
totalLines
= Integer.parseInt(line);
if
(totalLines <= 0) {
System.out.println("The total lines must be a
positive integer: " + line);
return;
}
break;
} catch
(NumberFormatException ex) {
System.out.println("Cannot find the total lines: " + line);
return;
}
}
}
int lineCount = 0;
while
(scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.equals("")) {
lineCount++;
Scanner s = new
Scanner(line).useDelimiter(" ");
String name = s.next();
int numberOfEmailAddresses =
s.nextInt();
EmailList emailList = new
EmailList(name);
for (int i = 0; i <
numberOfEmailAddresses; i++) {
emailList.addEntry(new EmailAddress(s.next()));
}
directory.addEmailList(emailList);
if (lineCount >=
totalLines) {
break;
}
}
}
scanner.close();
} else {
System.out.println(filename + " not found");
}
}
/**
* Prompts user to enter a name that represents the
EmailList
* and returns the name.
*
* @return String
*/
private String enterName(String prompt) {
String name = null;
boolean done = false;
while (!done) {
System.out.print(prompt);
while
(!sc.hasNextLine()) {
sc.next();
}
name = sc.nextLine().trim();
if
(!name.equals("")) {
done = true;
}
}
return name;
}
private void enterEmailAddress(EmailList emailList)
{
boolean done = false;
EmailAddress emailAddress =
null;
while (!done) {
emailAddress =
new EmailAddress();
emailAddress.addAddress(sc, "y");
emailList.addEntry(emailAddress);
sc.nextLine();
System.out.print("Another? y/n: ");
while
(!sc.hasNextLine()) {
sc.next();
}
String option = sc.nextLine().toLowerCase();
if
(option.equals("y")) {
continue;
} else if
(option.equals("n")) {
done = true;
} else {
System.out.println("Invalid option, please try
again.");
}
}
}
/**
* Finds the specified EmailList for the given
name.
*
* @return EmailList
*/
private EmailList findEmailList(String name) {
return
directory.findEmailList(name);
}
private Scanner openFile(String filename) {
File file = new File(filename);
if (file.exists()) {
try {
Scanner scanner = new Scanner(file);
return scanner;
} catch
(FileNotFoundException e) {
return null;
}
} else {
return
null;
}
}
}
Directory.java
import java.util.List;
import java.util.ArrayList;
public class Directory {
private List<EmailList> list = null;
/**
* Default constructor.
*/
public Directory() {
this.list = new
ArrayList<EmailList>();
}
/**
* Adds an EmailList to the directory.
*
* @param EmailList
*/
public void addEmailList(EmailList emailList) {
list.add(emailList);
}
/**
* Displays all EmailLists in the directory.
*/
public void display() {
System.out.println("The email lists
are: ");
for (EmailList emailList: list)
{
emailList.display();
}
}
/**
* Finds the specified EmailList for the given
name.
*
* @return EmailList
*/
public EmailList findEmailList(String name) {
for (EmailList emailList: list)
{
if
(emailList.isEqual(name)) {
return emailList;
}
}
return null;
}
}
EmailAddress.java
import java.util.Scanner;
public class EmailAddress {
private String address = new String();
//***************** default constructor
******************************************
public EmailAddress() {
}
//***************** initial constructor
******************************************
public EmailAddress (String address) {
if (address.contains ("@")
&& address.contains(".") && address.length() >=
7)
this.address =
new String (address);
}
//*****************
toString
**************************************************
public String toString() {
return address;
}
//***************** addAddress
**************************************************
public void addAddress(Scanner in, String prompt)
{
if (prompt.charAt(0) == 'y')
System.out.print
("Enter valid email address: ");
address = in.next();
while (!address.contains ("@") ||
!address.contains(".") || address.length() < 7) {
System.out.print
("Enter valid email address...must contain @ and .: ");
address =
in.next();
}
}
}
EmailList.java
import java.util.List;
import java.util.LinkedList;
public class EmailList {
private String name = null;
private List<EmailAddress> addresses = null;
/**
* Parameterized constructor.
*/
public EmailList(String name) {
this.name = name;
this.addresses = new
LinkedList<EmailAddress>();
}
/**
* Adds an entry to the list.
*
* @param EmailAddress
*/
public void addEntry(EmailAddress emailAddress)
{
addresses.add(emailAddress);
}
/**
* Removes the entry at the specified position in the
list.
*/
public void deleteEntry(int index) {
addresses.remove(index);
}
/**
* Displays all entries in the list.
*/
public void display() {
System.out.print(name + ":[");
for (int i = 0; i <
addresses.size(); i++) {
if (i >
0)
System.out.println(",");
System.out.print(addresses.get(i));
}
System.out.println("]");
}
/**
* Shows all entries in the directory for
selection.
*/
public void show() {
System.out.println(name);
for (int i = 0; i <
addresses.size(); i++) {
System.out.println(i + " " + addresses.get(i));
}
}
/**
* Compares the EmailList with name.
*
* @param name
* @return boolean
*/
public boolean isEqual(String name) {
if (this.name.equals(name)) {
return
true;
} else {
return
false;
}
}
/**
* Returns the number of entries in the list.
*
* @return the number of entries in the list
*/
public int size() {
return addresses.size();
}
}
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