Question

JAVA :The following are descriptions of classes that you will create. Think of these as service providers. They provide a service to who ever want to use them. You will also write a TestClass with a main() method that fully exercises the classes that you create. To exercise a class, make some instances of the class, and call the methods of the class using these objects. Paste in the output from the test program that demonstrates your classes’ functionality. Testing the classes must be included as part of the assignment. As we get started with creating classes, it can be quite formulaic. Each class should include: - private instance variables, (declared one per line) - at least one constructor that has the same number of parameters as there are instance variables, accessor and mutator methods, - an accessor and a mutator for each instance variable (getters and setters) - a toString() method that returns a String object including the values of all of the instance variables. ==================== 1. Telephone.java Implement a class called Telephone that will be used to store telephone numbers. The class should store the area code, and the local number as separate instance variables of type String. It has only 2 instance variables. As well as the 2 argument constructor that accepts 2 String objects, create an overloaded constructor method that accepts an integer, and a String. You can convert an int to a String by concatenating an empty String to the int. String s = “” + 127; Look at the formula for creating a class above. Make sure you have included all of the parts. This class provides the ‘service’ of storing telephone numbers so you can pass them around as a single thing. The primitive data types allow us to store and pass around numbers, and characters, but the world we want to program in is the world the problems exist in. Your Telephone class is a new data type. An instance of the Telephone class is an object. 2. Address.java Implement a class called Address that will store a postal address. As well as a suitable constructor the class should have accessors, mutators, toString. What are the component parts (instance variables) of an Address? Street, apartment, country, postal code?? I expect these to be somewhat different – it is your design for how to provide the service of storing an address. 3. Contact.java Create a class called Contact that maintains the following information: name address telephone number email address The data type of the instance variable name will be String. Notice that String is the name of a class, not a primitive. What data type should you use to define the address? In the previous part of this assignment you created a very nice data type called Address. Now is the time to use it. private Address address; Your data types can use your other data types. This is called composition, or the HAS A relationship. If you say it out loud and it makes sense, then the design is correct. “A Contact HAS A Address” A Contact HAS A Telephone Follow the rules in the formula for creating classes. Constructor, accessors, mutators, toString. ======================================== This part is not a really useful thing to add to the Contact class. It’s here because I want you to see how a static variable declared in a class is different from an instance variable. The Contact class will have a Class variable (static) called contactsCreated, and a class (static) method called getContactsCreated. This variable will count how many instances of the Contact class have been created so far. Add one to this variable inside the constructor method. Each time you make an instance of the Contact class, the static variable is incremented.

Answer 1

File Telephone.java package service.provider.project; public class Telephone { private String AreaCode; private String LocalNumber; public Telephone() { AreaCode = "00"; LocalNumber = "00"; } public Telephone(String areaCode, String localNumber) { AreaCode = areaCode; LocalNumber = localNumber; } public Telephone(int areaCode, String localNumber) { AreaCode = ""+areaCode; LocalNumber = localNumber; } public String getAreaCode() { return AreaCode; } public void setAreaCode(String areaCode) { AreaCode = areaCode; } public String getLocalNumber() { return LocalNumber; } public void setLocalNumber(String localNumber) { LocalNumber = localNumber; } @Override public String toString() { return "TELEPHONE NUMBER::" + "\n Area Code : " + AreaCode + "\nLocal Number : " + LocalNumber; } }

File Address.java package service.provider.project; public class Address { private String ApartmentNo; private String StreetName; private String State; private String Country; private long postalCode; public Address() { ApartmentNo = "00"; StreetName = "NA"; State = "NA"; Country = "NA"; postalCode = 0; } public Address(String apartmentNo, String streetName, String state, String country, long postalCode) { ApartmentNo = apartmentNo; StreetName = streetName; State = state; Country = country; this.postalCode = postalCode; } public String getApartmentNo() { return ApartmentNo; } public void setApartmentNo(String apartmentNo) { ApartmentNo = apartmentNo; } public String getStreetName() { return StreetName; } public void setStreetName(String streetName) { StreetName = streetName; } public String getState() { return State; } public void setState(String state) { State = state; } public String getCountry() { return Country; } public void setCountry(String country) { Country = country; } public long getPostalCode() { return postalCode; } public void setPostalCode(long postalCode) { this.postalCode = postalCode; } @Override public String toString() { return "ADDRESS:: \nApartmentNumber : " + ApartmentNo + ", Street Name : " + StreetName + "\nState : " + State +", Country : " + Country + "\nPostal Code : " + postalCode ; } }

File Contact.java package service.provider.project; public class Contact { private String name; private Address address; private Telephone telephoneNo; private String e_mail; private static int contactsCreated = 0; public Contact() { this.name = "NA"; this.address = new Address("00", "NA", "NA", "NA", 0); this.telephoneNo = new Telephone("00", "00"); this.e_mail = "NA @ NA.com"; contactsCreated++; } public Contact(String name, Address address, Telephone telephoneNo, String e_mail) { this.name = name; this.address = address; this.telephoneNo = telephoneNo; this.e_mail = e_mail; contactsCreated++; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } public Telephone getTelephoneNo() { return telephoneNo; } public void setTelephoneNo(Telephone telephoneNo) { this.telephoneNo = telephoneNo; } public String getE_mail() { return e_mail; } public void setE_mail(String e_mail) { this.e_mail = e_mail; } public static int getContactsCreated() { return contactsCreated; } @Override public String toString() { return "CONTACT DETAILS:::" + "\n Name : " + name + "\n\n"+ address + "\n\n" + telephoneNo + "\n\nE - mail : " + e_mail; } }

Driver File Service.java package service.provider.project; import java.util.Scanner; public class Service { static Scanner input = new Scanner(System.in); public static void main(String[] args) { Telephone[] telephone = new Telephone[20]; Address[] address = new Address[20]; Contact[] contact = new Contact[20]; int count = 0; while(true) { String choice = ""; System.out.println("*** Welcome to Jacobs's Company! ***\n"); System.out.println("### MENU ###\n"); System.out.println("(A)dd a Service seeker: "); System.out.println("(D)isplay Service seekers Contact Details: "); System.out.println("(Q)uit"); System.out.print("Enter your choice: "); choice = input.nextLine(); if(choice.equalsIgnoreCase("A")) { telephone[count] = new Telephone(); address[count] = new Address(); contact[count] = new Contact(); addContact(telephone[count], address[count], contact[count]); addTelephone(telephone[count]); addAddress(address[count]); System.out.println("\nDetails saved successfully for customer name: "+contact[count].getName()); System.out.println("\n"); count++; continue; } else if(choice.equalsIgnoreCase("D")) { String name; System.out.print("Enter name of the customer: "); name = input.nextLine(); int flag = 0; for(int i = 0; i<count; i++) { if(contact[i].getName().equalsIgnoreCase(name.trim())) { System.out.println("\n*** Found "+(i+1)+" ***\n\n"); System.out.println(contact[i]); System.out.println(); flag = 1; } } if(flag == 0) System.out.println("\n@ No such customer found @"); } else if(choice.equalsIgnoreCase("Q")) { System.out.println("Thank you, Please visit again\n"); break; } else { System.out.println("Invalid Choice!"); continue; } } } public static void addTelephone(Telephone t1) { String AreaCode; String LocalNumber; System.out.print("Enter Area Code: "); AreaCode = input.nextLine(); System.out.print("Enter the telephone number: "); LocalNumber = input.nextLine(); t1.setAreaCode(AreaCode); t1.setLocalNumber(LocalNumber); } public static void addAddress(Address adr) { String ApartmentNo; String StreetName; String State; String Country; long postalCode; System.out.println("\nEnter Address Details."); System.out.print("Enter Apartment number: "); ApartmentNo = input.nextLine(); System.out.print("Enter street name: "); StreetName = input.nextLine(); System.out.print("Enter State: "); State = input.nextLine(); System.out.print("Enter country name: "); Country = input.nextLine(); System.out.print("Enter postal code: "); postalCode = Long.parseLong(input.nextLine()); adr.setApartmentNo(ApartmentNo); adr.setStreetName(StreetName); adr.setState(State); adr.setCountry(Country); adr.setPostalCode(postalCode); } public static void addContact( Telephone t1, Address adr, Contact c1) { String name; Address address; Telephone telephoneNo; String e_mail; System.out.println("\n|| Enter customer Details ||\n"); System.out.print("Enter the customer name: "); name = input.nextLine(); System.out.print("Enter e-mail address: "); e_mail = input.nextLine(); c1.setAddress(adr); c1.setTelephoneNo(t1); c1.setName(name); c1.setE_mail(e_mail); } }

Directions: Open your ide create a new java project with package name service.provider.project and within this package create 4 new classes named Telephone, Address, Contact, and Service after then copy paste the above codes into their respective .java files and run the driver file Service.java

OUTPUT

Problems Javadoc DeclarationConsoleProgress <terminated> Service [Java Application] C:\Program FilesUavare1.8.0_45 binavaw.exe (10-Jul-2017, 10:06:37 am ***Welcome to Jacobs's Company! ## MENU ### (A)dd a Service seeker: (D)isplay Service seekers Contact Details: (Q)uit Enter your choice: a Enter customer Details. Enter the customer name: Expert Enter e-mail address: xyzxyz.com Enter Area Code: 120 Enter the telephone number: 1234 Enter Address Details. Enter Apartment number: 122 Enter street name: txy Enter State: xyz Enter country name: India Enter postal code: 123456 Details saved successfully for customer name: Expert Welcome to Jacobs's Company! ## MENU ### (A)dd a Service seeker: (D)isplay Service seekers Contact Details: (Q)uit Enter your choice: d

8: Problems @Javadoc 다 Declaration貝Console X | Progress <terminated> Service [Java Application] C:\Program Filesavare1.8.0_45 binavaw.exe (10-Jul-20 JU ***Welcome to Jacobs's Company! ## MENU ### (A)dd a Service seeker: (D)isplay Service seekers Contact Details: (Q)uit Enter your choice: d Enter name of the customer: expert Found 1 CONTACT DETAILS::: Name Expert ADDRESS: ApartmentNumber 122, Street Name txy State : xyz, Country India Postal Code: 123456 TELEPHONE NUMBER: Area Code 120 Local Number 1234 E mail : [email protected] Welcome to Jacobs's Company! ## MENU ### (A)dd a Service seeker: