Philip Stone

Well I've sorted my AddressBook Class out for the time being .. i think

Working on the View Entries in my text ui

This is my AddressBook Class now:

public class AddressBook { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 5; //array of Address Book Entries private Contact[] list; /** * Constructor for objects of class AddressBook */ public AddressBook() { list = new Contact[MAXENTRIES]; } public Contact getContact(int n) { if(n >= top) return null; return list[n]; } public void addContact(Contact contact) { if(top == MAXENTRIES) throw new IllegalStateException("The Addressbook is full"); list[top++] = contact; } public void removeContact(Contact contact) { if(top == MAXENTRIES) throw new IllegalStateException("The Addressbook is full"); list[top--] = contact; } public void viewContact(Contact contact) { for( int index = 0; index < top; index++) { System.out.println((index+1)+" Forename:"+ list[index].toString()); System.out.println((index+1)+" Surname:"+ list[index].toString()); System.out.println((index+1)+" Street:"+ list[index].toString()); System.out.println((index+1)+" City:"+ list[index].toString()); System.out.println((index+1)+" County:"+ list[index].toString()); System.out.println((index+1)+" Country:"+ list[index].toString()); System.out.println((index+1)+" Postcode:"+ list[index].toString()); } } boolean isFull() { return top == MAXENTRIES; } boolean isEmpty() { return top == 0; } }


And inside my TextBookUi Class

public void viewEntries(){ if(addressbook.isEmpty()){ System.out.println("Address Book is empty"); return; } Contact contact = new Contact(name, address); addressbook.viewContact(contact); }

When i compile however it says that it cannot find the variable name and i presume address as well.
I believe its looking in the correct place my contact class

public class Contact { private Address address; private Name name; public Contact(Name name, Address address) { this.name = name; this.address = address; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Contact other = (Contact) obj; if (address == null) { if (other.address != null) return false; } else if (!address.equals(other.address)) return false; if (name == null) { if (other.name != null) return false; } else if (!name.equals(other.name)) return false; return true; } @Override public String toString() { return super.toString() + "\n" + address + "\n" + name + "\n"; } }

I believe i initalise the list array in my AddressBook class :

public class AddressBook { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 4; //array of Address Book Entries private Contact[] list; private Contact contact; /** * Constructor for objects of class AddressBook */ public AddressBook() { list = new Contact[MAXENTRIES]; }

How do i go about making it null?

Hey,
I have the majority of the program working now with all the classes.

Currently working on the addEntry() method within the AddressTextUi.
All the classes compile and i am able to show the menu, when you enter the right option it goes to add entry
it then asks for each of the data variables to be entered forename, surename, street address so on. However once it gets to the end on the last input i get an error message

"java.lang.String.NullPointerException: null"

and it points to this list[top] = entry;

AddressTextUi Class:

public class AddressTextUi { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 4; // private AddressBook[] list; private AddressBook addressbook; public void mainMenu() { displayMainMenu(); } /** *The main method - DISPLAYS OPTIONS, TAKES THE OPTION AND CHECKS APPROPRIATE ACTION */ private void displayMainMenu(){ BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); AddressTextUi addressBook = new AddressTextUi(); String act = ""; while(true) { //displays the options System.out.println("Address Book Main Menu - Select An Option:"); System.out.println(""); System.out.println("\n[A] ADD ENTRY"); System.out.println("[D] DELETE ENTRY"); System.out.println("[V] VIEW ALL ENTRIES"); System.out.println("[S] SEARCH ENTRIES BY SURNAME"); System.out.println("[Q] Quit"); System.out.println(""); System.out.println("Enter Desired Option: "); try{ //gets the choice act = keyIn.readLine(); }catch(Exception e){ System.out.println("Error"); } //checks for the appropriate action if(act.equals("A")||act.equals("a")) addressBook.addEntry(); else if(act.equals("D")||act.equals("d")) addressBook.delEntry(); else if(act.equals("V")||act.equals("v")) addressBook.viewEntries(); else if(act.equals("Q")||act.equals("q")) {System.out.println("Program Closing Down"); System.exit(0);} else System.out.println("Unknown command"); } } public void addEntry() { BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter Contact Details: "); String forename = ""; String surname = ""; String street = ""; String city = ""; String county = ""; String country = ""; String post = ""; if(top == MAXENTRIES){ System.out.println("Address Book is full"); return; } //asks the user for the data of the address book try{ System.out.print("Forename: "); forename = keyIn.readLine(); System.out.print("Surname: "); surname = keyIn.readLine(); System.out.print("Street: "); street = keyIn.readLine(); System.out.print("City: "); city = keyIn.readLine(); System.out.print("County: "); county = keyIn.readLine(); System.out.print("Country: "); country = keyIn.readLine(); System.out.print("Postcode: "); post = keyIn.readLine(); }catch(Exception e){ System.out.println(e); System.exit(0); } Name name = new Name(forename, surname); Postcode postcode = new Postcode(post); Address address = new Address(street, city, county, country); AddressBook entry = new AddressBook(); list[top] = entry; top++; }




Address Class:

public class AddressBook { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 4; //array of Address Book Entries private Contact[] list; private Contact contact; /** * Constructor for objects of class AddressBook */ public AddressBook() { list = new Contact[MAXENTRIES]; } public AddressBook(Contact contact) { this.contact = contact; } public Contact getContact() { return contact; } public void setContact(Contact contact) { this.contact = contact; } }

I'm just trying to get the AddressBook class working, i only really need the menu in the text ui i think.

The search by last name and print all contacts work fine but looking at the add entry which was taken from the old it doesn't link at all with the other classes, I really need help sorting this am getting a bit flustered as i only have a couple days left to finish, Please help

import java.io.*; import java.util.Scanner; public class AddressBook { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 10; //array of Address Book Entries private Contact[] list; /** * Constructor - creates a new, empty address book */ public AddressBook() { list = new Contact[MAXENTRIES]; } /** * Add a new contact to the collection */ public void addEntry() { BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); String first = ""; String second = ""; String last = ""; String street =""; String city = ""; String county = ""; String country = ""; String post = ""; if(top == MAXENTRIES){ System.out.println("Address Book is full"); return; } //asks the user for the data of the address book try{ System.out.print("First Name: "); first = keyIn.readLine(); System.out.print("Second Name: "); second = keyIn.readLine(); System.out.print("Last Name: "); last = keyIn.readLine(); System.out.print("Street: "); street = keyIn.readLine(); System.out.print("City: "); city = keyIn.readLine(); System.out.print("County: "); county = keyIn.readLine(); System.out.print("Country: "); country = keyIn.readLine(); System.out.print("Postcode: "); post = keyIn.readLine(); }catch(Exception e){ System.out.println(e); System.exit(0); } Contact entry = new Contact(); list[top] = entry; top++; } public Contact searchEntry(String lastName) { // Sequential Search Contact person = null; for (int i = 0; i < top; i++) { Contact p = list[i]; if (p.getLastName().equalsIgnoreCase(lastName)) { person = p; break; } } return person; } /** * Print collection of contacts */ public void viewEntries() { for (int i = 0; i < top; i++) { System.out.println(list[i]); } } }

Okay i'll look to changing, thanks

I just need help now with my addressbook class and the text ui, I still have the text ui i was using at the start when it linked to one other class.

This is what i believe should be in my addressbook class, the texui is underneath

addressbook class:

/** * Write a description of class AddressBook here. * * @author (your name) * @version (a version number or a date) */ public class AddressBook { private Contact[] collection; private int count; /** * Constructor - create a new, empty address book */ public AddressBook() { } /** * Add a new contact to the collection */ public void addContact(Contact c) { } /** * Provide the full name of a contact */ public String getFullName(int index) { } /** * Provide the rest of the current information about a contact */ public String[] getAddressInfo(int index) { } /** * Remove a specific contact from the collection */ public void removeContact(int index) { } /** * Update stored information about a contact */ public void updateContact(int index, String street, String city, String county, String country, String post) { } /** * Print the collection of contacts in order */ public void printAll() { } }



TextUi:

import java.io.*; import java.util.Scanner; /** * CREATES ADDRESSBOOK CONTAINING 10 ENTRIES */ public class AddressTextUi { //index of the last entry private int top = 0; //constant number that indicates the maximum //number of entries in the address book private static final int MAXENTRIES = 10; //array of Address Book Entries private AddressBook [] list; public void mainMenu() { displayMainMenu(); } /** *The main method - DISPLAYS OPTIONS, TAKES THE OPTION AND CHECKS APPROPRIATE ACTION */ private void displayMainMenu(){ BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); AddressTextUi addBook = new AddressTextUi(); String act = ""; while(true) { //displays the options System.out.println("\n[A] ADD ENTRY"); System.out.println("[D] DELETE ENTRY"); System.out.println("[U] UPDATE ENTRY"); System.out.println("[V] VIEW ALL ENTRIES"); System.out.println("[S] SEARCH ENTRIES BY SURNAME"); System.out.println("[Q] Quit"); System.out.println("Enter desired action: "); try{ //gets the choice act = keyIn.readLine(); }catch(Exception e){ System.out.println("Error"); } //checks for the appropriate action if(act.equals("A")||act.equals("a")) addBook.addEntry(); else if(act.equals("D")||act.equals("d")) addBook.delEntry(); else if(act.equals("V")||act.equals("v")) addBook.viewEntries(); else if(act.equals("U")||act.equals("u")) addBook.updateEntry(); else if(act.equals("S")||act.equals("s")) addBook.searchEntry(); else if(act.equals("Q")||act.equals("q")) {System.out.println("Program Closing Down"); System.exit(0);} else System.out.println("Unknown command"); } } /** * CREATES THE ADDRESSBOOK */ public AddressTextUi() { list = new AddressBook [MAXENTRIES]; } /** * METHOD FOR ADDING AN AddressBook TO THE ADDRESSBOOK */ public void addEntry(){ BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); String name = ""; String add = ""; if(top == MAXENTRIES){ System.out.println("Address Book is full"); return; } //asks the user for the data of the address book try{ System.out.print("Name: "); name = keyIn.readLine(); System.out.print("Address: "); add = keyIn.readLine(); }catch(Exception e){ System.out.println(e); System.exit(0); } AddressBook entry = new AddressBook (); list[top] = entry; top++; } /** * METHOD FOR DELETING AN AddressBook Entry FROM THE ADDRESSBOOK WITH THE INDEX */ public void delEntry(){ BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); int index = 0; //checks if the address book is empty if(top == 0){ System.out.println("Address Book is empty"); return; } //asks for the entry which is to be deleted try{ //shows the current entries on the record book viewEntries(); System.out.print("\nEnter entry number: "); index = Integer.parseInt(keyIn.readLine())-1; }catch(Exception e){} //checks if the index is with in bounds if(index < 0 || index >= top){ System.out.println("Index Out Of Bounds"); return; } list[top] = null; top--; } /** * PRINTS ALL THE ENTRIES OF THE ADDRESSBOOK */ public void viewEntries(){ //checks if the address book is empty if(top == 0) { System.out.println("Address Book is empty"); return; } for( int index = 0; index < top; index++) { System.out.println((index+1)+" Name:"+ list[index].getName()); System.out.println("Address:"+ list[index].getAddress()); } } /** * UPDATES ENTRIES */ public void updateEntry() { BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); int index = 0; String name = ""; String add = ""; //checks if the address book is empty if(top == 0){ System.out.println("Address Book is empty"); return; } //asks for the entries data try{ viewEntries(); System.out.print("Entry number: "); index =Integer.parseInt(keyIn.readLine())-1; //checks if the index is with in bounds if(index < 0 || index >= top){ System.out.println("Index Out Of Bounds"); return; } System.out.print("Name: "); name = keyIn.readLine(); System.out.print("Address: "); add = keyIn.readLine(); }catch(Exception e){ System.out.println(e); System.exit(0); } //updates the entry AddressBook entry = new AddressBook (name, add); list[index] = entry; } /** * SEARCH LIST BY SURNAME */ public void searchEntry() { BufferedReader keyIn = new BufferedReader(new InputStreamReader(System.in)); int index = 0; boolean found = false; //checks if the address book is empty if(top == 0){ System.out.println("Address Book is empty"); return; } } }

This is what i have at the moment:

Postcode class:
import java.util.regex.Matcher; import java.util.regex.Pattern; public class Postcode { private String post; public Postcode(String post) { this.post = post; } public void checkValidation() { String regexp="^([A-PR-UWYZ](([0-9](([0-9]|[A-HJKSTUW])?)?)|([A-HK-Y][0-9]([0-9]|[ABEHMNPRVWXY])?)) [0-9][ABD-HJLNP-UW-Z]{2})$"; Pattern pattern = Pattern.compile(regexp); Matcher matcher = pattern.matcher(post.toUpperCase()); if (matcher.matches()) { System.out.println("This is a valid UK Postcode."); } else { System.out.println("This is not a valid UK Postcode."); } } public String getPost() { return post; } public void setPost(String post) { this.post = post; } public String toString() { return (post); } }


Name class:
public class Name { private String firstName; private String middleName; private String lastName; /** * Default Constructor */ public Name () { firstName = ""; middleName = ""; lastName = ""; } public Name (String first, String middle, String last) { changeName(first, middle, last); } /** * changes all variables of name */ public void changeName(String first, String middle, String last) { firstName = first; middleName = middle; lastName = last; } /** * returns the variable first name */ public String getFirstName() { return firstName; } /** * returns the variable middle name */ public String getMiddleName() { return middleName; } /** * returns the variable last name */ public String getLastName() { return lastName; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Name other = (Name) obj; if (firstName == null) { if (other.firstName != null) return false; } else if (!firstName.equals(other.firstName)) return false; if (middleName == null) { if (other.middleName != null) return false; } else if (!middleName.equals(other.middleName)) return false; if (lastName == null) { if (other.lastName != null) return false; } else if (!lastName.equals(other.lastName)) return false; return true; } @Override public String toString() { return String.format( "First Name: %s, Second Name: %s, Last Name: %s", firstName, middleName, lastName); } }

Address class:
public class Address { private String street; private String city; private String county; private String country; private Postcode post; public Address() { } public Address(String street, String city, String county, String country, Postcode post) { this.street = street; this.city = city; this.county = county; this.country = country; this.post = post; } public String getStreet() { return street; } public void setStreet(String street) { this.street = street; } public void setPost(Postcode post) { this.post = post; } public Postcode getPost() { return post; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Address other = (Address) obj; if (city == null) { if (other.city != null) return false; } else if (!city.equals(other.city)) return false; if (county == null) { if (other.county != null) return false; } else if (!county.equals(other.county)) return false; if (country == null) { if (other.country != null) return false; } else if (!country.equals(other.country)) return false; if (street == null) { if (other.street != null) return false; } else if (!street.equals(other.street)) return false; if (post == null) { if (other.post != null) return false; } else if (!post.equals(other.post)) return false; return true; } @Override public String toString() { return String.format( "Street Address: %s, City: %s, County: %s, Country %s, Postcode: %s", street, city, county, country, post); } public Address copy() { Address address = new Address(); address.setStreet(this.getStreet()); address.setCity(this.getCity()); address.setCounty(this.getCounty()); address.setCountry(this.getCountry()); address.setPost(this.getPost()); return address; } public void print() { System.out.println(this); } }

Contact class:
public class Contact extends Name { private Address address; private Name name; public Contact() { super(); this.address = new Address(); } public Contact(String first, String middle, String last) { super(first, middle, last); this.address = new Address(); } public Contact(String first, String middle, String last, Address address) { super(first, middle, last); this.address = new Address(); } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Contact other = (Contact) obj; if (address == null) { if (other.address != null) return false; } else if (!address.equals(other.address)) return false; if (name == null) { if (other.name != null) return false; } else if (!name.equals(other.name)) return false; return true; } @Override public String toString() { return super.toString() + "\n" + address + "\n" + name + "\n"; } public Contact copy() { Contact person = new Contact(); person.changeName(this.getFirstName(), this.getMiddleName(), this.getLastName()); person.setAddress(this.getAddress()); return person; } }

Thanks i'll have a read, are these methods essential for this to work then because this is the first i've seen any of this. Also nothing happens when you call the void main(String[]args) method from the postcodedemo

i'll really sorry i feel like an idiot but i don't understand what you mean :/

I just need some clarification when i'm going about this right

This is what i have so far for my contact class

public class Contact { Address address; Name name; /** * Constructor for objects of class Contact */ public Contact() { } public void createContact(Name firstName, Name middleName, Name lastName) { } }

And this is what i have so far for my addressbook class

public class AddressBook { private Contact[] collection; private int count; /** * Constructor - create a new, empty address book */ public AddressBook() { } /** * Add a new contact to the collection */ public void addContact(String firstName, String middleName, String lastName, String street, String city, String county, String country, String post) { } /** * Provide the full name of a contact */ public String getFullName(int index) { } /** * Get the current size of the collection */ public int getNumberOfContacts() { } /** * Provide the rest of the current information about a contact */ public String[] getAddressInfo(int index) { } /** * Remove a specific contact from the collection */ public void removeContact(int index) { } /** * Update stored information about a contact */ public void updateContact(int index, String street, String city, String county, String country, String post) { } /** * Print the collection of contacts in order */ public void printAll() { } }

Okay i'll leave postcode and address class alone, just get the address class working like before and work on the contact class now.

For the contact class i just have the members:

Address address; Name name;

then just need to have a createContact method i guess

yeah i thought that and didn't have a parameter for the get method before i must of read something wrong and put it in for some reason. I've cleared it up now so it's less confusing with the postcode class and the type.

Still having this issue in my address class though when typing in a postcode

so in the postcode class:
public String getPostcode(String postcode) { return postcode; } public void setPostcode(String postcode) { this.postcode = postcode; }

and address class:
public void setPostcode(Postcode postcode) { this.postcode = postcode; } public Postcode getPostcode(Postcode postcode) { return postcode; }

are you suggesting to remove the set method from the address class?

So this is the current code in the address class, it compiles now but when you try and set the postcode i get an error - found java.lang.string but expected Postcode, the get postcode method seems to work fine but as i can't seem it set it i only return a null each time which is expected

public void setPostcode(Postcode postcode) { this.postcode = postcode; } public Postcode getPostcode() { return postcode; }

Code in postcode class:

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Postcode { private String postcode; public Postcode(String postcode) { this.postcode = postcode; String regexp="^([A-PR-UWYZ](([0-9](([0-9]|[A-HJKSTUW])?)?)|([A-HK-Y][0-9]([0-9]|[ABEHMNPRVWXY])?)) [0-9][ABD-HJLNP-UW-Z]{2})$"; Pattern pattern = Pattern.compile(regexp); Matcher matcher = pattern.matcher(postcode.toUpperCase()); if (matcher.matches()) { System.out.println("This is a valid UK Postcode."); } else { System.out.println("This is not a valid UK Postcode."); } } public String getPostcode() { return postcode; } public void setPostcode(String postcode) { this.postcode = postcode; } }

thats what i have at the moment, wrong but i can't see why i thought it would follow like the set postcode method

public String getPostcode(Postcode postcode) { return postcode; }

Yeah i mentioned it previously, i've fixed that now so it works properly.

I also need the method get postcode i assume in the address class, i keep getting an error saying it finds postcode but expected java.lang.string which it is.

After this i think i can pretty much sort out addressbook and contact class