Explain the concept of java dice roll?
I've written a basic dice program in Java which takes a number of faces then randomly selects a number within that boundary. Here is the code:
package com.georgegibson.diceroller;
import java.util.Random;
import java.util.Scanner;
public class DiceRoller
{
public static void main(String []args)
{
Random dice = new Random();
Scanner input = new Scanner(System.in);
int faces;
int result;
System.out.println("Dice Rollern");
System.out.println("How many faces does the dice have?");
faces = input.nextInt();
result = dice.nextInt(faces) + 1;
System.out.println("nThe dice rolled a " + result + ".");
}
}
Seeing as I am pretty new to Java (I come from C/C++ land), I should think this can be improved, but how?
In your code you have declared a variable dice which is a Random. This is an indication that you have a mismatch between the object and the implementation. The fact that you call it 'dice' implies you want something that is a Dice.... not a Random. A Dice should be able to "encapsulate" itself.
I would suggest a clean Java object oriented design would have a Dice class, something like:
public class Dice {
private final Random rand;
private final int faces;
public Dice(int faces) {
this.rand = new Random();
this.faces = faces;
}
public int dice roll() {
return 1 + rand.nextInt(faces);
}
}Now you have a class that represents a dice, and you can roll that dice, and you now have a main method that looks like:
public static void main(String []args)
{
Scanner input = new Scanner(System.in);
System.out.println("Dice Roller
");
System.out.println("How many faces does the dice have?");
Dice dice = new Dice(input.nextInt());
System.out.println("
The dice rolled a " + dice.roll() + ".");
}You can reuse that dice, or create other dice with a different number of faces.
Note, there's always going to be a discussion about the singular "Die", and the plural is "Dice". One Die, many Dice.... but I say "who cares" call it a Dice.... Creating a class called "Die" is just wrong 