LabActivity.java

import java.util.*;

public class LabActivity {
   public static void main(String[] args) {

      Scanner con = new Scanner(System.in);

      // 1
      System.out.print("Enter your lastname: ");
      String lastname = con.next().toLowerCase();
      System.out.print("Enter your firstname: ");
      String firstname = con.next().toLowerCase();
      System.out.print("Enter your middle initial: ");
      String middlename = con.next();
      System.out.println("Your name is: " + formatName(lastname, firstname, middlename));

      // 2
      System.out.print("\nEnter a String With Special Characters: ");
      String data = con.next();
      System.out.println("The repeated symbol is: " + extractUniqueSpecialCharacters(data));

      // 3
      System.out.print("\nEnter a email: ");
      String email = con.next();
      System.out.println("The email is: " + isEmailValid(email));

      // call and test your methods here
      // provide inputs as arguments to your methods
   }

   /*
    * Create your own method that returns the complete name in this format:
    * 
    * Sample parameter or input: lastname: PaTiNo firstname: jOaQUIn mi : sArNo
    * 
    * result or return value: Joaquin S. Patino NOTE: there must be a period after
    * the middle initial Error TRAP: lastname and firstname and middle name MUST
    * NOT CONTAIN any number, even at least 1 number. If the user does not follow
    * the error trap rule, return an empty string.
    * 
    */

   public static String formatName(String lastname, String firstname, String middlename) {
      String formattedName = "";

      int countfirstname = firstname.length();
      int countlastname = lastname.length();

      char firstnameLetterCapital = firstname.toUpperCase().charAt(0);
      char lastnameLetterCapital = lastname.toUpperCase().charAt(0);
      char finalmiddlename = middlename.toUpperCase().charAt(0);

      String finalfirstname = firstnameLetterCapital + firstname.substring(1, countfirstname);
      String finallastname = lastnameLetterCapital + lastname.substring(1, countlastname);

      formattedName = finalfirstname + " " + finalmiddlename + ". " + finallastname;
      return formattedName;
   }

   /*
    * Create a method or function that accepts a string as paramter and extract or
    * collect all special characters in that string WITHOUT DUPLICATES OR REPEATING
    * VALUES.
    * 
    * Example parameter: 123abc@#...#131#^^.. Sample return value: @#.^
    */
   public static String extractUniqueSpecialCharacters(String data) {
      String result = "";

      for (int count = 0; count < data.length() - 1; count++) {
         char temp = data.charAt(count);

         if (!Character.isDigit(temp) && !Character.isLetter(temp)) {
            if (result.indexOf(temp) == -1) { // checks if there is no repetition of a character
               result = result + temp;
            }

         }

      } // loop exit

      return result;
   }

   /*
    * Create a method or function that accepts a string as the email and check if
    * the email is valid or not.
    * 
    * A valid email must have ONLY 1 @ AND ONLY 1 .(PERIOD)
    * 
    * Sample parameter: ken@gmail.com return value: true
    * 
    * Sample parameter: ken@gmailcom return value: false (no period)
    * 
    * Sample parameter: ken@@@gmail.com return value: false (too many @)
    * 
    * Sample parameter: kengmail...com return value: false (too many .(period) and
    * no @)
    */
   public static boolean isEmailValid(String email) {
      boolean emailValid = false;
      int symbol1 = 0;
      int symbol2 = 0;

      for (int count = 0; count < email.length(); count++) {
         char temp = email.charAt(count);

         if (temp == '@') {
            symbol1 = symbol1 + 1;
         }

         if (temp == '.') {
            symbol2 = symbol2 + 1;
         }

      } // loop exit

      if (symbol1 > 1 && symbol2 > 1) {
         emailValid = false;
      }

      if (symbol1 == 1 && symbol2 == 1) {
         emailValid = true;

      }

      return emailValid;
   }
}