ApplicationContact

package com.contact.application;

public class Contacts {
	private String first_Name;
	private String last_Name;
	private String phone_no;
	private String email_id;
	private boolean isFavorite;
	
	public boolean isFavorite() {
		return isFavorite;
	}
	public void setIsFavorite(boolean isFavorite) {
		this.isFavorite= isFavorite;
	}
	public String getFirst_Name() {
		return first_Name;
	}
	public void setFirst_Name(String first_Name) {
		this.first_Name = first_Name;
	}
	public String getLast_Name() {
		return last_Name;
	}
	public void setLast_Name(String last_Name) {
		this.last_Name = last_Name;
	}
	public String getPhone_no() {
		return phone_no;
	}
	public void setPhone_no(String phone_no) {
		this.phone_no = phone_no;
	}
	public String getEmail_id() {
		return email_id;
	}
	public void setEmail_id(String email_id) {
		this.email_id = email_id;
	}
	
	
	
}
package com.contact.application;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class ServiceContact {
	static List<Contacts> listOfContacts = new ArrayList<Contacts>();
	static BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
	public static void addNewContact() throws IOException {
		Contacts b = new Contacts();
		System.out.print("Enter your first Name: ");
		b.setFirst_Name(sc.readLine());
		System.out.println();
		System.out.print("Enter your last_Name: ");
		b.setLast_Name(sc.readLine());
		System.out.println();
		System.out.print("Enter your phone_number: ");
		b.setPhone_no(sc.readLine());
		if (Utility.isValidPhone_no(b.getPhone_no())) {
			System.out.println("Okay! , correct");
		} else {
			b.setPhone_no(sc.readLine());
			System.out.println(Utility.isValidPhone_no(b.getPhone_no()));
		}
		System.out.println();
		System.out.print("Enter your Email_id: ");
		b.setEmail_id(sc.readLine());
		if (Utility.isValid(b.getEmail_id())) {
			System.out.println("Okay ! , correct");
		} else {
			b.setEmail_id(sc.readLine());
			System.out.println(Utility.isValid(b.getEmail_id()));
		}

		System.out.println("Do you want as a favorite Contact: true/false");
		b.setIsFavorite(Boolean.parseBoolean(sc.readLine()));
		if (b.isFavorite()) {
			listOfContacts.add(b);
		}
		else {
		listOfContacts.add(b);
	}
	}
	public static boolean updateContact(String phone_no) throws IOException {
		Contacts m = new Contacts();
		int pos = isAvailble(phone_no);
		if (pos < 0) {
			return false;
		} else {
			System.out.print("Enter your first Name: ");
			m.setFirst_Name(sc.readLine());
			System.out.println();
			System.out.print("Enter your last_Name: ");
			m.setLast_Name(sc.readLine());
			System.out.println();
			System.out.print("Enter your phone_number: ");
			m.setPhone_no(sc.readLine());
			if (Utility.isValidPhone_no(m.getPhone_no())) {
				System.out.println("Okay! , correct");
			} else {
				m.setPhone_no(sc.readLine());
				System.out.println(Utility.isValidPhone_no(m.getPhone_no()));
			}
			System.out.println();
			System.out.print("Enter your Email_id: ");
			m.setEmail_id(sc.readLine());
			if (Utility.isValid(m.getEmail_id())) {
				System.out.println("Okay ! , correct");
			}
			listOfContacts.set(pos, m);
			return true;
		}
		}

	public static boolean remove(String phone_no) throws IOException {
		int pos = isAvailble(phone_no);
		if (pos < 0) {
			return false;
		} else {
			listOfContacts.remove(pos);
			return true;
		}
	}

	public static int isAvailble(String contactPhoneNumber) {
		for (int i = 0; i < listOfContacts.size(); i++) {
			Contacts phone = listOfContacts.get(i);
			if (phone.getPhone_no().equals(contactPhoneNumber)) {
				return i;
			}
		}
		return -1;
	}

	public static void search() throws IOException {
		int flag =0;
		System.out.println("Search first_Name:");
		String first_Name = sc.readLine();
		Iterator<Contacts> it = listOfContacts.iterator();
		while (it.hasNext()) {
			Contacts p = it.next();
			if (p.getFirst_Name().equals(first_Name)) {
				System.out.println(p.getFirst_Name() + " " + p.getLast_Name() + " " + " " + p.getPhone_no() + " "
						+ p.getEmail_id());
				flag =1;
			}
		}
		if(flag==0) {
			System.out.println("Name not found!!");
		}
	}

	public static void display() {
		if (listOfContacts.size() <= 0) {
			System.out.println("No Contact in the list");
		}
		else  {
			iteration(false);
		}
	}
	public static void favorite() {
		if (listOfContacts.size() <= 0) {
			System.out.println("No Contact in the list");
		}
		else {
			  iteration(true); 
		}
	}
	public static void iteration(boolean b) {
	      Collections.sort(listOfContacts, new NameSorting());
		Iterator<Contacts> itr = listOfContacts.iterator();
		while(itr.hasNext()) 
		{
			Contacts k = itr.next();
			if(k.isFavorite() && b ) {
				System.out.println(k.getFirst_Name()+" "+ k.getLast_Name()+" "+k.getPhone_no()+" "+k.getEmail_id());
			}
			else if(!b) {
				System.out.println(k.getFirst_Name()+" "+ k.getLast_Name()+" "+k.getPhone_no()+" "+k.getEmail_id());
			}
			
		
		}
	}
}
	
	
package com.contact.application;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Utility {

	public static boolean isValidPhone_no(String phone_no) throws IOException {

		Pattern p = Pattern.compile("(0/91)?[7-9][0-9]{9}");
		Matcher m = p.matcher(phone_no);
		if (m.find() && m.group().equals(phone_no)) {
			return true;
		} else {
			System.out.println("Enter your correct mobile_No:");
			return false;

		}
	}
		public static boolean isValid(String email) throws IOException {
			String emailRegex = "^[a-zA-Z0-9_+&*-]+(?:\\." + "[a-zA-Z0-9_+&*-]+)*@" + "(?:[a-zA-Z0-9-]+\\.)+[a-z"
					+ "A-Z]{2,7}$";

			Pattern pat = Pattern.compile(emailRegex);
			if (pat.matcher(email).matches()) {
				return true;
			} else {
				System.out.print("Enter your correct mail_id : ");
				return false;
			}
		}
}
package com.contact.application;

import java.util.Comparator;


public class NameSorting implements Comparator<Contacts> {
	
	 public int compare(Contacts o1, Contacts o2) {
         Contacts c1 = (Contacts) o1;
         Contacts c2 = (Contacts) o2;
         int res =  c1.getFirst_Name().compareToIgnoreCase(c2.getFirst_Name());
         if (res != 0)
             return res;
         return c1.getLast_Name().compareToIgnoreCase(c2.getLast_Name());
     }
	}

package com.contact.application;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class ContactApplication {
	public static void main(String[] args) throws IOException {
		Contacts b = new Contacts();
		BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
		int choice = 0;
		do {
			System.out.println("____________________________");
			System.out.println("1: Add a contact Details");
			System.out.println("2: update a contact");
			System.out.println("3: Remove the contact");
			System.out.println("4: Favorite contact ");
			System.out.println("5: Display the contact");
			System.out.println("6: Search contact details");
			choice = Integer.parseInt(sc.readLine());
			switch (choice) {
			case 1:
				ServiceContact.addNewContact();
				break;
			case 2:
				if (ServiceContact.listOfContacts.size() <= 0) {
					System.out.println("No Contact in the list");
				}
				else {
				b.setPhone_no(sc.readLine());
				if(ServiceContact.updateContact(b.getPhone_no())) {
						 System.out.println(" Details have been updated");
				 }
				 else {
					 System.out.println("Phone number is not in list");
				 }
				}
				break;
			case 3:
				if (ServiceContact.listOfContacts.size() <= 0) {
					System.out.println("No Contact in the list");
				}
				else {
				b.setPhone_no(sc.readLine());
				if(ServiceContact.remove(b.getPhone_no())) {
					System.out.println("Deleted Succuessfully");
				}
				else {
					System.out.println("The number is not in  list");
				}
				}
				break;
			case 4:
				System.out.println("Favorite List");
			ServiceContact.favorite();
				break;
			case 5:
				System.out.println("Contact List");
				ServiceContact.display();
                    break;
			case 6:
				if (ServiceContact.listOfContacts.size() <= 0) {
					System.out.println("No Contact in the list");
				}
				else {
			     ServiceContact.search();
				}
			break;
			}
		} while (choice != 7);

	}

		
	}