Dicecode RPG , Java. What's wrong with this code?

Question

Hello, please could you help me with this code?
I am trying to set up a method that reads input from the user, a text String specifically coded to include the number of dice tosses, type of dice and the modifier, eg. 3D8+5 , 2D20-2, D6-1, 3D100-15, etc..but I can't exit the while(true) loop assuming that the string text is writed properly at least having one of the dice type included, here' s the code. thank you in advance.
import java.util.Random;
import java.util.Scanner;
public class rpgDiceGame {
static final String[] DICE = {"D3","D4","D6","D8","D10","D12","D20","D100"};
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("Please input your dice code string: ");
String diceCode = scan.next();
chkCode(diceCode);
}
static int chkCode (String input) {
while(getString(input));
String[] diceParts = (input.split("D|\\+\\-"));
int toss = Integer.parseInt(diceParts[0]);
int diceType = Integer.parseInt(diceParts[1]);
if (input.contains("-")) {
int modifier = -(Integer.parseInt(diceParts[2]));
return (number(diceType, toss) + modifier);
} else {
int modifier = Integer.parseInt(diceParts[2]);
return (number(diceType, toss) + modifier);
}
}
static boolean getString (String str) {
boolean result = false;
for (String x : DICE) {
if (!str.contains(x)) {
result = true;
}
}
return result;
}
static int number(int num1, int num2) {
int sum = 0;
Random roll = new Random();
for (int i = 0; i < num2; i

Answer 1

The method didn't paste completely: number(int num1, int num2){
Int sum=0;
Random roll = new Random();
For(int i=0;i<num 2;i++) {
Int result = roll.nextInt(num1)+1;
sum+=result;
}
return sum;
}