Welcome to Practice House, in this post i will share with you an ArrayList Challenge for Java. the challenge is Create a program that implements a simple mobile phone Contacts Option . So we will learn step by step how to Create a program that implements a simple mobile phone Contacts Option Using ArrayList in Java.
Step 1: Create Contacts.java
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package com.practice.house; import java.util.ArrayList; class Contacts { private String name; private String phoneNumber; public Contacts(String name, String phoneNumber) { this.name = name; this.phoneNumber = phoneNumber; } public String getName() { return name; } public String getPhoneNumber() { return phoneNumber; } // Calling constructor in createContact Method public static Contacts createContact(String name, String phoneNumber) { return new Contacts(name, phoneNumber); } ArrayList<String> contactList = new ArrayList<String>(); public ArrayList<String> getContactList() { return contactList; } public void storeContacts(String names) { contactList.add(names); } public void printContactList() { System.out.println("You have " + contactList.size() + " Contacts in your list."); for(int i = 0; i < contactList.size(); i++) { System.out.println(i + " - " + contactList.get(i)); } } } |
Step 2: Create MobilePhone.java
All the method implementation we will do in this class. We will create method to add , update, remove and for query our contact.
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package com.practice.house; import java.util.ArrayList; public class MobilePhone { private String myNumber; private ArrayList<Contacts> myContacts; public MobilePhone(String myNumber) { this.myNumber = myNumber; this.myContacts = new ArrayList<Contacts>(); } // Adding a new contact public boolean addNewContact(Contacts contact) { // Before adding a contact we are checking that its exist or not if(findContact(contact.getName()) >= 0) { System.out.println("Contact is already on file"); } //If Not exist then add our contact myContacts.add(contact); return true; } //Update Contact using set method public boolean updateContact(Contacts oldContact , Contacts newContact) { int foundPosition = findContact(oldContact); if(foundPosition < 0) { System.out.println(oldContact.getName() + " , was not found"); return false; } this.myContacts.set(foundPosition, newContact); System.out.println(oldContact.getName() + ", was replaced with " + newContact.getName()); return true; } // Remove Contact public boolean removeContact(Contacts contact) { int foundPosition = findContact(contact); if(foundPosition < 0) { System.out.println(contact.getName() + " , was not found"); return false; } this.myContacts.remove(foundPosition); System.out.println(contact.getName() + " was deleted"); return true; } // Find Contact Position private int findContact(Contacts contact) { return this.myContacts.indexOf(contact); } // Find Contact Names private int findContact(String contactName) { for(int i =0; i < myContacts.size(); i++) { // Creating another temporary object to hold the name and compare Contacts contacts = this.myContacts.get(i); if(contacts.getName().equals(contactName)) { return i; } } return -1; } // query contact public String queryContact(Contacts contact) { if(findContact(contact) >= 0) { return contact.getName(); } return null; } public Contacts queryContact(String name) { int position = findContact(name); if(position >=0) { return this.myContacts.get(position); } return null; } public void printContacts() { System.out.println("Contact list"); for(int i = 0; i < this.myContacts.size(); i++) { System.out.println((i+1) + " ." + this.myContacts.get(i).getName() + " -> " + this.myContacts.get(i).getPhoneNumber()); } } } |
Step 3: Create Main.java
This Main.java will be our main class. so we will use all those method that we already created in MobilePhone.java . We will run our program also from this class because our main class will have our Main Function.
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package com.practice.house; import java.util.Scanner; public class Main { private static Scanner scanner = new Scanner(System.in); // Creating an instant with a default Number private static MobilePhone mobilePhone = new MobilePhone("000 443 876"); public static void main(String[] args) { boolean quite = false; startPhone(); printAction(); while(!quite) { System.out.println("\n Enter action: (6 to show available actions)"); int action = scanner.nextInt(); scanner.nextLine(); switch (action) { case 0: System.out.println("\n Shuting down .. "); quite = true; break; case 1: mobilePhone.printContacts(); break; case 2: addNewContact(); break; case 3: updateContact(); break; case 4: removeContact(); break; case 5: queryContact(); break; case 6: printAction(); break; } } } private static void addNewContact() { System.out.println("Enter new Contact Name: "); String name = scanner.nextLine(); System.out.println("Enter phone Number: "); String phone = scanner.nextLine(); Contacts newContact = Contacts.createContact(name, phone); if(mobilePhone.addNewContact(newContact)) { System.out.println("New Contact Added: name = "+ name + " , phone" + phone ); }else { System.out.println("Can't add, " + name +" already on file"); } } private static void updateContact() { System.out.println("Enter existing contact name : "); String name = scanner.nextLine(); Contacts extContact = mobilePhone.queryContact(name); if(extContact == null) { System.out.println("Cannot found contact"); return; } System.out.println("Enter new Conatct Name: "); String newName = scanner.nextLine(); System.out.println("Enter new Phone Number: "); String newNumber = scanner.nextLine(); Contacts newContact = Contacts.createContact(newName, newNumber); if(mobilePhone.updateContact(extContact, newContact)) { System.out.println("Successfully updated"); }else { System.out.println("Error Updating Contact"); } } private static void removeContact() { System.out.println("Enter existing contact name : "); String name = scanner.nextLine(); Contacts extContact = mobilePhone.queryContact(name); if(extContact == null) { System.out.println("Cannot found contact"); return; } if(mobilePhone.removeContact(extContact)) { System.out.println("Successfully deleted"); }else { System.out.println("Error Deleting Contact"); } } private static void queryContact() { System.out.println("Enter existing contact name : "); String name = scanner.nextLine(); Contacts extContact = mobilePhone.queryContact(name); if(extContact == null) { System.out.println("Cannot found contact"); return; } System.out.println("Name : " + extContact.getName() + " Phone Number is: " + extContact.getPhoneNumber()); } private static void startPhone() { System.out.println("Starting Phone . . ."); } private static void printAction() { System.out.println("\nAvailable actions:\npress"); System.out.println("0 - to shutDown\n" + "1 - to print contacts\n"+ "2 - to add a new contact\n"+ "3 - to update an existing contact\n"+ "4 - to remove and existing contact\n"+ "5 - query for existing contact\n"+ "6 - to print a list of available actions."); System.out.println("Choose Your Action: "); } } |
After Complete our Main.Java Let’s Run our application and see what’ s the output.
OUTPUT SAMPLE:
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Starting Phone . . . Available actions: press 0 - to shutDown 1 - to print contacts 2 - to add a new contact 3 - to update an existing contact 4 - to remove and existing contact 5 - query for existing contact 6 - to print a list of available actions. Choose Your Action: Enter action: (6 to show available actions) 2 Enter new Contact Name: Alif Enter phone Number: 123456 New Contact Added: name = Alif , phone123456 Enter action: (6 to show available actions) 2 Enter new Contact Name: Teddy Enter phone Number: 56789 New Contact Added: name = Teddy , phone56789 Enter action: (6 to show available actions) 1 Contact list 1 .Alif -> 123456 2 .Teddy -> 56789 Enter action: (6 to show available actions) 3 Enter existing contact name : Alif Enter new Conatct Name: Alex Enter new Phone Number: 123456 Alif, was replaced with Alex Successfully updated Enter action: (6 to show available actions) 4 Enter existing contact name : Teddy Teddy was deleted Successfully deleted Enter action: (6 to show available actions) 5 Enter existing contact name : Teddy Cannot found contact Enter action: (6 to show available actions) 5 Enter existing contact name : Alif Cannot found contact Enter action: (6 to show available actions) 5 Enter existing contact name : Alex Name : Alex Phone Number is: 123456 Enter action: (6 to show available actions) 6 Available actions: press 0 - to shutDown 1 - to print contacts 2 - to add a new contact 3 - to update an existing contact 4 - to remove and existing contact 5 - query for existing contact 6 - to print a list of available actions. Choose Your Action: Enter action: (6 to show available actions) 0 Shutting down .. |
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Md Arifur Rahman, Nickname is Alif.
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