I need help with this Java program: ** Note, the main function should be in its...
I need help with this Java program:
** Note, the main function should be in its own class.
The application simulates a mobile phone with a Contacts application. The mobile phone must be able to store, modify, query, and remove contact names. The Contacts class will contain the name. phone number, and email of contacts. Use composition to demonstrate the Mobile Phone class to contains an array of Contacts. The Mobile Phone class should provide a menu of options to include add a new contact, update an existing contact, remove a contact , search for a contact, print all contacts, and quit the application. Do not enable duplicate contacts. Before adding or updating, you must check if the contact exists.
Homework Answers
CODE :
Main.java
/************
Mobile phone contacts
*************/
import java.io.*;
import java.util.*;
//Mobile Phone class - you can rename the class as "MobilePhone". If you do, dont forget to rename the file name also to "MobilePhone.java"
public class Main
{
public static void main(String[] args)
{
//To keep track of number of contacts
int count = 0;
//To get user's choice
int choice = 0;
//local variables
String name, email;
long number;
//Scanner object to read data
Scanner read = new Scanner(System.in);
//Creating an ArrayList of contacts - without mentioning size
ArrayList<Contact> contactList = new ArrayList<Contact>();
//loop till user selects 6 - quit option
while(choice!=6)
{
//Display the menu options
System.out.println("\n** CONTACTS APPLICATION **\n\n");
System.out.println("1. Add contact\n2. Update an existing contact\n3. Remove contact\n4. Search a contact\n5. Print all contacts\n6. Quit\nEnter an option: ");
choice = read.nextInt();
//switch and perform the action accordingly
switch(choice)
{
case 1:
{
//dummy object to add to array list
Contact dummy = new Contact();
System.out.println("Enter Contact name: ");
name = read.next() ;
//if there are no contacts, get other details and add it to array list
if(count == 0)
{
System.out.println("Enter Contact number: ");
number = read.nextLong() ;
System.out.println("Enter Contact email: ");
email = read.next() ;
dummy.setName(name);
dummy.setEmail(email);
dummy.setNumber(number);
contactList.add(dummy);
//now we have one contact added, increment the count
count++;
System.out.println("Contact has been added to the Application");
}
else
{
int contains = 0;
//when there are 1 ore more contacts present, check if there is a contact already present with the name
for(int i=0;i<count;i++)
{
//contactList.get(i) - returns object at ith position and .getName returns the name of the bject at ith position
if(name.equals(contactList.get(i).getName()))
{
contains = 1;
break;
}}
//Checking contains value after loop, we can know if the element is present or not
if(contains == 1)
{
//if the name alread exists, print appropriate message
System.out.println("Name already exists");
}
else
{
//if not, get the remaining etails and add it to list
System.out.println("Enter Contact number: ");
number = read.nextLong() ;
System.out.println("Enter Contact email: ");
email = read.next() ;
dummy.setName(name);
dummy.setEmail(email);
dummy.setNumber(number);
contactList.add(dummy);
//don't forget to increment count after adding
count++;
System.out.println("Contact has been added to the Application");
}}
break;
}
case 2:
{
System.out.println("Enter Contact name to update: ");
name = read.next();
//Check if the contact is present - same as what we did in add method
int contains = 0;
for(int i=0;i<count;i++)
{
//contactList.get(i) - returns object at ith position and .getName returns the name of the bject at ith position
if(name.equals(contactList.get(i).getName()))
{
System.out.println("Enter Contact number to update: ");
number = read.nextLong();
//update the number of contact at position i
contactList.get(i).setNumber(number);
System.out.println("Contact details updated.");
contains = 1;
break;
}
}
//if contains remains 0 that means the name is not present
if(contains == 0)
{
System.out.println("Contact is not found in the application");
}
break;
}
case 3:
{
System.out.println("Enter Contact name to remove: ");
name = read.next();
//Check if the contact is present - same as what we did in add method
int contains = 0;
for(int i=0;i<count;i++)
{
if(name.equals(contactList.get(i).getName()))
{
//if found, remove it using array list function remove() at index i
contactList.remove(i);
System.out.println("Contact removed.");
//Don't forgtet to decrement after removing
count--;
contains = 1;
break;
}
}
//if contains remains 0 that means the name is not present
if(contains == 0)
{
System.out.println("Contact is not found in the application");
}
break;
}
case 4:
{
System.out.println("Enter Contact name to search: ");
name = read.next();
//Check if the contact is present
int contains = 0;
for(int i=0;i<count;i++)
{
if(name.equals(contactList.get(i).getName()))
{
//if found then display of contact at index i
System.out.println("Contact found. Details:");
System.out.println("Contact Name: " + contactList.get(i).getName());
System.out.println("Contact Number: " + contactList.get(i).getNumber());
System.out.println("Contact Email: " + contactList.get(i).getEmail());
contains = 1;
break;
}
}
//if contains remains 0 that means the name is not present
if(contains == 0)
{
System.out.println("Contact is not found in the application");
}
break;
}
case 5:
{
System.out.println("\nDisplaying all contact details:");
for(int i=0;i<count;i++)
{
System.out.println("\nContact Name: " + contactList.get(i).getName());
System.out.println("Contact Number: " + contactList.get(i).getNumber());
System.out.println("Contact Email: " + contactList.get(i).getEmail());
}
break;
}}}}}
Contact.java:
//Define the contact class
class Contact
{
//Declare required variables
String name, email;
long number;
// to access the variables
void setName(String n)
{
name = n;
}
void setEmail(String mail)
{
email = mail;
}
void setNumber(long n)
{
number = n;
}
String getName()
{
return name;
}
String getEmail()
{
return email;
}
long getNumber()
{
return number;
}}
OUTPUT:
CODE SCREENSHOTS:
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