HackerRank- Java Solutions

Java Day 28: RegEx, Patterns, and Intro to Databases

Consider a database table, Emails, which has the attributes First Name and Email ID. Given N rows of data simulating the Emails table, print an alphabetically-ordered list of people whose email address ends in @gmail.com.

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Solution {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();

        String emailRegEx = "[email protected]\\.com$";
        Pattern pattern = Pattern.compile(emailRegEx);

        ArrayList<String> list = new ArrayList<>();

        for (int i = 0; i < N; i++) {
            String name = in.next();
            String email = in.next();
            Matcher matcher = pattern.matcher(email);

            if (matcher.find()) list.add(name);
        }

        Collections.sort(list);

        list.forEach(System.out::println);
    }
}