This project uses a class that defines a die and a class that defines a pair of dice that holds two die objects. Both of these classes have overloaded constructors. The coordination of the classes is somewhat complicated for what seems to be a simple application.

Console

Operation

• If the user chooses to roll the dice, the application rolls two six-sided dice, displays the results of each, and asks if the user wants to roll again.

Specifications

• Create a class named Die to store the data about each die. This class should contain these constructors and methods:

public Die()              // default to a six-sided die
public Die(int sides)     // allow a variable number of sides
public void roll()
public int getValue()
 	

• Create a class named PairOfDice to store two dice. This class should contain two instance variables of the Die type, an instance variable that holds the sum of the two dice, and these constructors and methods:

public PairOfDice()           // default to six-sided dice
public PairOfDice(int sides)  // allow a variable number of sides
public void roll()
public int getValue1()        // get value of die1
public int getValue2()        // get value of die2
public int getSum()           // get the sum of both dice
 	

• You can use the random method of the Math class to generate a random number from 1 to the number of sides on a die like this:

int value = (int) (Math.random() * sides);

• Create a class named DiceRollerApp that uses the PairOfDice class to roll the dice. This class should display special messages for craps (sum of both dice is 7), snake eyes (double 1's), and box cars (double 6's). For this application, assume that two six-sided dice are used.
• Create a class named Validator that contains static methods that can be used to validate the data in this application.

As you need to concentrate only on working on the dice classes, here is the Validator class that you can use. Just copy and paste below. As there's an input by asking the user to continue or not, so you can use the Validator to validate the y or n. You can either use the validator or do your own as long as you make sure that the user enters only y, Y, n or N.

import java.util.Scanner; public class Validator { public static int getInt(Scanner sc, String prompt) { int i = 0; boolean isValid = false; while (isValid == false) { System.out.print(prompt); if (sc.hasNextInt()) { i = sc.nextInt(); isValid = true; } else { System.out.println("Error! Invalid integer value. Try again."); } sc.nextLine(); // discard any other data entered on the line } return i; } public static int getIntWithinRange(Scanner sc, String prompt, int min, int max) { int i = 0; boolean isValid = false; while (isValid == false) { i = getInt(sc, prompt); if (i <= min) System.out.println( "Error! Number must be greater than " + min); else if (i >= max) System.out.println( "Error! Number must be less than " + max); else isValid = true; } return i; } public static double getDouble(Scanner sc, String prompt) { double d = 0; boolean isValid = false; while (isValid == false) { System.out.print(prompt); if (sc.hasNextDouble()) { d = sc.nextDouble(); isValid = true; } else { System.out.println("Error! Invalid decimal value. Try again."); } sc.nextLine(); // discard any other data entered on the line } return d; } public static double getDoubleWithinRange(Scanner sc, String prompt, double min, double max) { double d = 0; boolean isValid = false; while (isValid == false) { d = getDouble(sc, prompt); if (d <= min) System.out.println( "Error! Number must be greater than " + min); else if (d >= max) System.out.println( "Error! Number must be less than " + max); else isValid = true; } return d; } public static String getRequiredString(Scanner sc, String prompt) { String s = ""; boolean isValid = false; while (isValid == false) { System.out.print(prompt); s = sc.nextLine(); if (s == null || s.equals("")) { System.out.println("Error! This entry is required. Try again."); } else { isValid = true; } } return s; } }