Hacker Rank Problem - Regex - Detect the Email Addresses

Detect the Email Addresses

The following is the solution to the Hacker Rank problem "Detect the Email Addresses" using Java. For solutions to other hacker rank problems visit my page HackerRank.

Score: 15/15

/**  *  */ package hackerRank; import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; /**  * @author Arun.G  *  */ public class DetecttheEmailAddresses {        /**         * @param args         */        //for printing the email's separated by Semicolon     public static void printList(ArrayList<String> list)     {         String result="";         for(String email : list)         {             result+= email+";";         }         //remove the last semicolon         result = result.substring(0,result.length()-1);         System.out.println(result);     }     public static void main(String[] args) {         /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */          Scanner sc = new Scanner(System.in);         ArrayList<String> list = new ArrayList<String>();         int no = sc.nextInt();         while(no-->=0)         {             String word = sc.nextLine();             if(!word.equals(""))             {                 String emailPattern ="(\\b[a-z_.]{1,}@[a-z.]*[a-z]{1,3}\\b)";                 Pattern pattern = Pattern.compile(emailPattern,Pattern.CASE_INSENSITIVE);                 Matcher m = pattern.matcher(word);                 while(m.find())                 {                     String emailAddress = m.group(1);                     if(!list.contains(emailAddress))                         list.add(emailAddress);                 }                                }         }         //sorting for lexicographical order         Collections.sort(list);         //printing the result         printList(list);     } }