DnDice V1.2

package Independent_Example_Programs;
import java.util.Scanner;
import java.util.concurrent.ThreadLocalRandom;
public class DnDice
{
    public static void main( String args[] )
    {
        Scanner keyboard = new Scanner(System.in);
        int i=0,maxvalueofdice_int,numberofdice_int,numberwithmodifier_int=0,sum=0,sumwithmodifier=0,average,largest=Integer.MIN_VALUE,smallest=Integer.MAX_VALUE,countuniquemodifiers=0;
        boolean addition=false,subtraction=false,multiplication=false,division=false,modifier=false;
        System.out.println("This program follows basic Dice Notation, Credits to Garry Gygax and Wizards of the Coast (Or whoever owns Dungeons and Dragons)");
        System.out.print("Enter Dice Roll: ");
        String dice=keyboard.next();//Takes the input of (x)d(y) and makes it a string
        if(dice.contains("d")){}
        else{System.out.println(dice+" does not contain correct format");System.exit(0);}//If dice does not contain atleast one d it will crash
        if(dice.contains("+")){addition=true;modifier=true;countuniquemodifiers++;}if(dice.contains("-")){subtraction=true;modifier=true;countuniquemodifiers++;}//Checking if modifiers are present
        if(dice.contains("*")){multiplication=true;modifier=true;countuniquemodifiers++;}if(dice.contains("/")){division=true;modifier=true;countuniquemodifiers++;}//Checking if modifiers are present
        if(countuniquemodifiers>=2){System.out.println(dice+" does not contain correct format");System.exit(0);}//If more than two unique modifiers exist it will crash
        String[] parts = dice.split("d|\\+|\\-|\\*|\\/");// Splits up the string "dice" by finding the d in (x)d(y), and also by splitting by modifier
        if(parts.length>3&&modifier==true){System.out.println(dice+" does not contain correct format");System.exit(0);}//If there was a modifier and there's more than 3 parts to parts it crashes
        if(parts.length>2&&modifier==false){System.out.println(dice+" does not contain correct format");System.exit(0);}//If there was not a modifier and there's more than 2 parts to parts it crashes
        String numberofdice=parts[0];//Part 0 represents the x, making numberofdice=x
        String maxvalueofdice=parts[1];//Part 1 represents the y, making maxvalueofdice=y
        if(modifier==true){//If there is a modifier
            String numberwithmodifier=parts[2];//Parts[2], which is the number after the modifier gets turned into a string
            numberwithmodifier_int=Integer.parseInt(numberwithmodifier);//And the string is then converted to the already intitialized int numberwithmodifer_int
        }
        numberofdice_int=Integer.parseInt(numberofdice);//Converts string to int
        maxvalueofdice_int=Integer.parseInt(maxvalueofdice);//Converts string to int
        int dicevalues[] = new int [(numberofdice_int)];//Makes array so that values may be called back to
        while(i<numberofdice_int)
        {
            int rando = ThreadLocalRandom.current().nextInt(1,(maxvalueofdice_int+1));//System.out.println("rando is "+rando);
            dicevalues[i]=rando;
            sum=sum+dicevalues[i];
            if(dicevalues[i]>=largest){largest=dicevalues[i];}
            if(dicevalues[i]<=smallest){smallest=dicevalues[i];}
            i++;
        }
        if(addition==true){sumwithmodifier=sum+numberwithmodifier_int;}
        if(subtraction==true){sumwithmodifier=sum-numberwithmodifier_int;}
        if(multiplication==true){sumwithmodifier=sum*numberwithmodifier_int;}
        if(division==true){sumwithmodifier=sum/numberwithmodifier_int;}
        average=(sum)/(numberofdice_int);
        if(numberofdice_int>1)
        {
            System.out.print("The dice rolled were ");i=0;
            while(i<numberofdice_int)
            {
                System.out.print(dicevalues[i]);
                if((i+1)==numberofdice_int){}
                else{System.out.print(", ");}
                i++;
            }
            System.out.print("\nAnd all the values added together is "+sum);if(modifier==true){System.out.println(", with a final value of "+sumwithmodifier);}else{System.out.println("");}
            System.out.println("The average is "+average);
            System.out.println("Smallest: "+smallest+"  Largest: "+largest);
        }
        else
        {
            System.out.print("The die rolled was "+dicevalues[0]);if(modifier==true){System.out.println(" with a final value of "+sumwithmodifier);}else{System.out.println("");}
        }
    }
}