Game.java

import java.util.*;

public class Game {

    public int totalGuesses;         //variable to store user's total of guesses

    private String input;            //variable to handle terminal input
    private MyRandomNumber rNumber;  //variable to instance a new MyRandomNumber object

    //Default Constructor
    public Game () {
        this.totalGuesses = 0;                //start at 0 guesses
        this.input = "";                      //start empty
        this.rNumber = new MyRandomNumber();  //new object
    }

    //Display main menu with game's modes
    public short DisplayMenu() {

        boolean isDone = false;                     //options
        int selection = -1;                         //beginning of the game
        Scanner inOption = new Scanner(System.in);  //initiate input


        System.out.println("---------------------------------------------------------");
        System.out.println("|           ###  Choose from these choices   ###        |");
        System.out.println("|-------------------------------------------------------|");
        System.out.println("|         1 Easy  : Guess a number between 1 and 20     |");
        System.out.println("|-------------------------------------------------------|");
        System.out.println("|         2 Normal: Guess a number between 1 and 100    |");
        System.out.println("|-------------------------------------------------------|");
        System.out.println("|         3 Hard  : Guess a number between 1 and 1000   |");
        System.out.println("|-------------------------------------------------------|");
        System.out.println("|         0 Exit                                        |");
        System.out.println("---------------------------------------------------------");
        System.out.print("> ");

        //while not a valid choice, keep looping
        while (!isDone) {
            try {
                //read input
                selection = (inOption.nextInt());
                //check if it is a valid option
                isDone = (selection >= 0 && selection <= 3);
                //if not ok, throw controlled exception
                if (!isDone) {
                    throw new Exception("Please enter 0, 1, 2 or 3: ");
                }
            } catch (InputMismatchException e) {
                //in case of not typing a digit, give err message and ask new guess
                selection = 0;
                System.err.println(inOption.next() + " was not valid input. Try again: ");
            } catch (Exception e) {
                //handle controlled exception
                System.err.println(e.getMessage());
            }
        }
        //when having valid option, call GameSetup method with the chosen option
        return this.GameSetup( (short) selection);
    }//END DisplayMenu

    //Set up min and max values and return the secret number
    private short GameSetup(short option) {

        switch (option){
            case 0:
                return option;
            case 1:
                rNumber.SetMaximum(20);     //20 is the max for Game Mode 1
                break;
            case 2:
                rNumber.SetMaximum(100);    //100 is the max for Game Mode 1
                break;
            case 3:
                rNumber.SetMaximum(1000);   //1000 is the max for Game Mode 1
                break;
            default:
                this.DisplayMenu();         //in case of some different value passes, menu is called again
                return -1;
        }
        rNumber.SetMinimum(1);              // min value is always 1 for this game

        //return a short Secret Number to be guessed
        return (short) rNumber.generateRandomNumber();
    }//END GameSetup

    //controls all the game interactions.
    public void PlayGame(short inNumber) {

        boolean isRight = false;                    //control if the guess is right

        Scanner inOption = new Scanner(System.in);  //initiate new object to read input values


        System.out.println("-------------------------------------");
        System.out.println("|  To leave the game press X   ###  |");
        System.out.println("-------------------------------------");

        //while is not the righe guess, os X is not pressed, continues looping
        while (!isRight) {
            try {

                this.totalGuesses++;                        //increment number of tried guesses

                System.out.println("Type your guess: ");
                System.out.print("> ");

                short guess = 0;                            //initiate guess as 0
                input = inOption.nextLine();

                //if input is x, user wants to exit game. Else, input guess is checked with Secret Number
                if (input.equals("x") || input.equals("X")) {
                    break;
                } else {
                    guess = Short.parseShort(input);    //get input guess
                    isRight = (inNumber == guess);      //set isRight true or false according to the guess
                }

                //if not the right number, clear screen, give a hint, and start the process again
                if (!isRight) {

                    System.out.println("--------------");
                    System.out.println(this.checkNumber(inNumber, guess));
                    System.out.println("--------------");
                }

            } catch (NumberFormatException | InputMismatchException e) {
                //in case of guess not a digit, raise a message error
                System.out.println(input + " was not valid input. Try again. ");
            }
        }

        //game is over. Stringify Secret Number
        String myNumber = Integer.toString(rNumber.getCurrentRandomNumber());

        System.out.println();
        System.out.println("-------------------------------");
        System.out.println("|  Thank you for playing!     |");
        System.out.println("|  The Magic number was " + padLeft(myNumber, 4) + "  |");
    }//END PlayGame

    //this method controls how close the guess is to the Secret Number
    private String checkNumber(short num, short bet) {

        float perc = (float) bet/num;
        return (perc > 1)
            ?
            ((perc-1 < 0.33f) ? "|  So close! A little bit down!  |" :
             (perc-1 < 0.66f) ? "|  Almost there! Guess a lower number.  |" :
                                "|  Too high!! Try miles below it!!!!  |")
            :
             (perc   < 0.33f) ? "|  So low!! Think Bigger!!!!!  |" :
             (perc   < 0.66f) ? "|  Half-way there. A larger number would work!!  |" :
                                "|  Getting Hot here! Guess a bit up!  |";
    }//END checkNumber

    //this method pad elements with spaces
    public static String padLeft(String str, int n) {
        return String.format("%1$" + n + "s", str);

    }
}//END class