PhoneBook.java

import java.util.*;
class Contact{
    String name;
    String number;
    Contact(String name, String number){
        this.name = name;
        this.number = number;
    }
}
public class PhoneBook {
    static ArrayList<Contact> contacts = new ArrayList<>();
    

    // Add new contacts
    public static void addContacts(String name, String number){
        contacts.add(new Contact(name, number));
        System.out.println("✅Contact added successfully!");

    }

    // Showing all contacts (sorted by name)
    public static void showContact(){
        if(contacts.isEmpty()){
            System.out.println("❌No contacts found!");
            return;
        }
        Collections.sort(contacts, Comparator.comparing(c -> c.name.toLowerCase()));

        System.out.println("\n--- Contact List---");
        for(Contact c : contacts){
            System.out.println("Name:" + c.name+ ", Number:" + c.number);
        }  
    }

    //Searching by name
    public static void searchContact(String name){
        boolean found = false;
        for(Contact c : contacts){
            if(c.name.equalsIgnoreCase(name)){
                System.out.println("✅Found: "+ c.name + " -> "+ c.number);
                found = true;
                break;
            }
        }
        if(!found){
            System.out.println("❌Contact not found!");
        }
    }
    public static void main(String[] args) {
      Scanner in = new Scanner(System.in);
      int choice;
      do{
        System.out.println("\n📞 Phonebook Menu:");
        System.out.println("1. Add Contact");
        System.out.println("2. Show Contacts");
        System.out.println("3. Search Contact");
        System.out.println("4. Exit");
        System.out.print("Enter your choice: ");
        choice = in.nextInt();
        in.nextLine();
        switch (choice) {
            case 1:
                System.out.print("Enter Name: ");
                String name = in.nextLine();
                System.out.print("Enter number: ");
                String number = in.nextLine();
                addContacts(name, number);
                break;
            case 2:
                showContact();
                break;
            case 3:
                System.out.print("Enter Name to Search: ");
                String searchName = in.nextLine();
                searchContact(searchName);
                break;
            case 4:
                System.out.println("👋 Exiting...");
                break;
            default:
                System.out.println("❌Invalid choice!");
        }
      } while(choice!=4);
        in.close();
      
    }

}