Question

I have a code and it works and runs as it supposed too. What is the UML for it? Any help will be awesome. Thanks.

import java.util.Scanner;

public class StringToMorseCode {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
  
char[] letters = { ' ', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };
String[] morseLetters = { " ", " .- ", " -... ", " -.-. ", " -.. ", " . ", " ..-. ", " --. ", " .... ", " .. ", " .--- ", " -.- ", " .-.. ", " -- ", " -. ", " --- ", " .--. ", " --.- ", " .-. ", " ... ", " - ", " ..- ", " ...- ", " .-- ", " -..- ", " -.-- ", " --.. ", " .---- ", " ..--- ", " ...-- ", " ....- ", " ..... ", " -.... ", " --... ", " ---.. ", " ----. ", " ----- "};
  
String textToChange = "";
String newText = "";

System.out.println("Enter the text you want to change to Morse code:");
textToChange = input.nextLine();
  
textToChange = textToChange.toLowerCase();
  
for (int i = 0; i < textToChange.length(); i++) {
for (short j = 0; j < 37; j++) {
if (textToChange.charAt(i) == letters[j]) {
newText += morseLetters[j];
newText += " ";
  
break;
}
}
}
  
System.out.println("Text in Morse Code:");
System.out.println(newText);
}
}

Answer 1

Since you have all the code inside main method, the resultant UML diagram will only have class name and main method and nothing else. So this code needs a bit of rearrangement before creating a sensible UML class diagram. Please find the below code which does the same thing as your previous code, but with a more object oriented approach.

StringToMorseCode.java (updated)

import java.util.Scanner;

public class StringToMorseCode {

      // array containing valid lower case letters

      char[] letters = { ' ', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',

                  'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',

                  'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };

      // String array containing morse code equivalents of above characters

      String[] morseLetters = { " ", " .- ", " -... ", " -.-. ", " -.. ", " . ",

                  " ..-. ", " --. ", " .... ", " .. ", " .--- ", " -.- ", " .-.. ",

                  " -- ", " -. ", " --- ", " .--. ", " --.- ", " .-. ", " ... ",

                  " - ", " ..- ", " ...- ", " .-- ", " -..- ", " -.-- ", " --.. ",

                  " .---- ", " ..--- ", " ...-- ", " ....- ", " ..... ", " -.... ",

                  " --... ", " ---.. ", " ----. ", " ----- " };

      // method to convert a text to morse code and return the resultant text

      String convertTextToMorseCode(String textToChange) {

            textToChange = textToChange.toLowerCase();

            String newText = "";

            for (int i = 0; i < textToChange.length(); i++) {

                  for (short j = 0; j < 37; j++) {

                        if (textToChange.charAt(i) == letters[j]) {

                              newText += morseLetters[j];

                              newText += " ";

                              break;

                        }

                  }

            }

            return newText;

      }

      public static void main(String[] args) {

            Scanner input = new Scanner(System.in);

            String textToChange = "";

            String newText = "";

            System.out.println("Enter the text you want to change to Morse code:");

            textToChange = input.nextLine();

            // creating an object of StringToMorseCode

            StringToMorseCode converter = new StringToMorseCode();

            // converting textToChange to morse code, assigning to newText

            newText = converter.convertTextToMorseCode(textToChange);

            // displaying results

            System.out.println("Text in Morse Code:");

            System.out.println(newText);

      }

}

UML DIAGRAM