[Java] Morse code program

/*Write a program that can translate Morse code in the format of ...---...
A space and a slash will be placed between words. ..- / --.-
For bonus, add the capability of going from a string to Morse code.
Super-bonus if your program can flash or beep the Morse.
This is your Morse to translate:
.... . .-.. .-.. --- / -.. .- .. .-.. -.-- / .--. .-. --- --. .-. .- -- -- . .-. / --. --- --- -.. / .-.. ..- -.-. -.- / --- -. / - .... . / -.-. .... .- .-.. .-.. . -. --. . ... / - --- -.. .- -.--
*/

import java.util.Scanner;
import java.util.HashMap;
import java.util.Map;

public class easy7{
     public static final java.util.Map<Character, String> codeLibrary;
     static{
        codeLibrary = new HashMap<>();
        codeLibrary.put('a',".-");  codeLibrary.put('b',"-...");
        codeLibrary.put('c',"-.-.");    codeLibrary.put('d',"-..");
        codeLibrary.put('e',".");   codeLibrary.put('f',"..-.");
        codeLibrary.put('g',"--."); codeLibrary.put('h',"....");
        codeLibrary.put('i',"..");  codeLibrary.put('j',".---");
        codeLibrary.put('k',"-.-"); codeLibrary.put('l',".-..");
        codeLibrary.put('m',"--");  codeLibrary.put('n',"-.");
        codeLibrary.put('o',"---"); codeLibrary.put('p',".--.");
        codeLibrary.put('q',"--.-");    codeLibrary.put('r',".-.");
        codeLibrary.put('s',"..."); codeLibrary.put('t',"-");
        codeLibrary.put('u',"..-"); codeLibrary.put('v',"...-");
        codeLibrary.put('w',".--"); codeLibrary.put('x',"-..-");
        codeLibrary.put('y',"-.--");    codeLibrary.put('z',"--..");
        codeLibrary.put('1',".----");   codeLibrary.put('2',"..---");
        codeLibrary.put('3',"...--");   codeLibrary.put('4',".----");
        codeLibrary.put('5',".....");   codeLibrary.put('6',"-....");
        codeLibrary.put('7',"--...");   codeLibrary.put('8',"---..");
        codeLibrary.put('9',"----.");   codeLibrary.put('0',"-----");
        codeLibrary.put(' ',"/");
       }
       public static final java.util.Map<String, Character> letterLibrary;
     static{
        letterLibrary = new HashMap<>();
        letterLibrary.put(".-", 'a');   letterLibrary.put("-...", 'b');
        letterLibrary.put("-.-.", 'c'); letterLibrary.put("-..", 'd');
        letterLibrary.put(".", 'e');    letterLibrary.put("..-.", 'f');
        letterLibrary.put("--.",'g');   letterLibrary.put("....", 'h');
        letterLibrary.put("..", 'i');   letterLibrary.put(".---", 'j');
        letterLibrary.put("-.-", 'k');  letterLibrary.put(".-..", 'l');
        letterLibrary.put("--", 'm');   letterLibrary.put("-.", 'n');
        letterLibrary.put("---", 'o');  letterLibrary.put(".--.", 'p');
        letterLibrary.put("--.-", 'q'); letterLibrary.put(".-.", 'r');
        letterLibrary.put("...", 's');  letterLibrary.put("-", 't');
        letterLibrary.put("..-", 'u');  letterLibrary.put("...-", 'v');
        letterLibrary.put(".--", 'w');  letterLibrary.put("-..-", 'x');
        letterLibrary.put("-.--", 'y'); letterLibrary.put("--..", 'z');
        letterLibrary.put(".----", '1');letterLibrary.put("..---", '2');
        letterLibrary.put("...--", '3');letterLibrary.put(".----", '4');
        letterLibrary.put(".....", '5');letterLibrary.put("-....", '6');
        letterLibrary.put("--...", '7');letterLibrary.put("---..", '8');
        letterLibrary.put("----.", '9');letterLibrary.put("-----", '0');
        letterLibrary.put("/", ' ');
       }
    public static void main(String args[]){
        String choice;
        String userInput;
        String userOutput;

        System.out.println("Welcome to the Morse code translator! \nWould you like to encode or decode Morse code?");
        choice = input();
        System.out.println("Please enter your String: ");
        userInput = input();

        if(choice.equals("encode")){
            userInput.toLowerCase();
            userOutput = encode(userInput);
            System.out.println("The encoded string is: " + userOutput);
            System.exit(0);
        }
        else if(choice.equals("decode")){
            userOutput = decode(userInput);
            System.out.println("The decoded string is" + userOutput);
            System.exit(0);
        }
        else{
            System.out.println("Sorry but your input could not be read, goodbye!");
            System.exit(0);
        }
    }
    public static String encode(final String userInput){
        final StringBuilder morse = new StringBuilder();

        for(int i = 0; i < userInput.length(); i++){
            if(i != 0){
                morse.append(' ');
            }
            morse.append(codeLibrary.get(userInput.charAt(i)));
        }
        return morse.toString();
    }
    public static String decode(String userInput){
        final StringBuilder morse = new StringBuilder();

        for(int i = 0; i < userInput.length(); i++){
            if(i != 0){
                morse.append(' ');
            }
            morse.append(letterLibrary.get(userInputcharAt());
        }
        return morse.toString();
    }
    public static String input(){
        Scanner inputs = new Scanner(System.in);
        String input = inputs.nextLine();
        return input;
    }
}