MessageConverter.java

import java.util.Scanner;

/**
 * Takes an input message, modifies message then outputs the modified message.
 *
 * @author Adam Bostwick
 * @version 9/9/19
 */
 
public class MessageConverter
{
   /** @param args Command line arguments (not used). */
   public static void main(String[] args)
   {
      Scanner userInput = new Scanner(System.in);
      String message = "";
      int outputType = 0;
      String result = "";
      
      System.out.print("Type in a message and press enter:\n\t> ");
      message = userInput.nextLine();

      System.out.print("\nOutput types:"
         + "\n\t0: As is "
         + "\n\t1: Trimmed"
         + "\n\t2: lower case"
         + "\n\t3: UPPER CASE"
         + "\n\t4: v_w_ls r_pl_c_d"
         + "\n\t5: Without first and last character"
         + "\nEnter your choice: ");
         
      outputType = Integer.parseInt(userInput.nextLine());
      
      if (outputType == 0) //as is
      {
         result = message;
      }
      else if (outputType == 1) //trimmed
      {
         result = message.trim();
      }
      else if (outputType == 2) //lower case
      {
         result = message.toLowerCase();
      }
      else if (outputType == 3) //upper case
      {
         result = message.toUpperCase();
      }
      else if (outputType == 4) //vowels replaces
      {
         result = message.replace('a', '_');
         result = result.replace('e', '_');
         result = result.replace('i', '_');
         result = result.replace('o', '_');
         result = result.replace('u', '_');
      }
      else if (outputType == 5) //without 1st and last character
      {
         result = message.substring(1, message.length() - 1);
      }
      else // invalid input
      {
         result = "Error: Invalid choice input.";
      }
      System.out.print("\n" + result);
      userInput.close();
   }
}