Math equation game

gistfile1.txt

package videogaming;

import javax.swing.*;

public class Game_NumberCruncher {

  private static class MathProblem {
		private String question;
		private int answer;

		public MathProblem() {
			int num1 = (int) (Math.round(Math.random() * 10));
			int num2 = (int) (Math.round(Math.random() * 10) + 1);
			int sign = (int) (Math.round(Math.random() * 4));

			if (sign == 0) {
				question = num1 + " * " + num2;
				answer = num1 * num2;
			} else if (sign == 1) {
				question = num1 + " / " + num2;
				answer = num1 / num2;
			} else if (sign == 2) {
				question = num1 + " + " + num2;
				answer = num1 + num2;
			} else if (sign == 3) {
				question = num1 + " - " + num2;
				answer = num1 - num2;
			} else {
				question = num1 + " % " + num2;
				answer = num1 % num2;
			}
		}

		public String getQuestion() {
			return question;
		}

		public int getAnswer() {
			return answer;
		}
	}

	public static void main(String[] args) throws Exception {
		// Variables
		int numcorrect = 0;
		String input = JOptionPane
				.showInputDialog("How many problem do you want to answer");
		for (int i = 0; i < Integer.valueOf(input); i++) {
			MathProblem mathProblem = new MathProblem();

			try {
				String userAnswer = JOptionPane
						.showInputDialog("What is the answer for "
								+ mathProblem.getQuestion());

				if (Integer.valueOf(userAnswer) == mathProblem.getAnswer()) {
					showMessage("You got it right!");
					numcorrect++;

				} else {
					showMessage("You are stupid the answer is "
							+ mathProblem.getAnswer());
				}
			} catch (NumberFormatException e) {
				showMessage("You didn't even type a number!");
			}

		}
		showMessage("You got " + numcorrect + " out of " + input
				+ " Right!");
	}

	private static void showMessage(String message) {
		JOptionPane.showMessageDialog(null, message);
	}
}