Java if Stuff in joptionpane

after a long time i came back to java and i try to write a short game about random numbers

The game should look like that:

1. A Text box appears which asks for the difficulty (Done)


2. A random number appears according to the difficulty (Stuck)


3. A Textbox says "You Won, roll Again?" or "You Lose, roll Again" in both cases a loop is needed thats starts at 2. (no clue...)

Im currently stuck at 2. i can generate a random number but after i choose the difficulty nothing happens

here's the code :

package randomnumbergame;

import java.awt.Component;
import javax.swing.JOptionPane;

public class RandomNumberGame { 

double n;
double e;
double h;
Component frame = null;            
String answer = null;

public static void main(String[] args) { 

    String[] options = new String[] {"Easy", "Normal", "Hard"};
        JOptionPane.showOptionDialog(null, "What Difficulty do you want ?", "Difficulty",                                
            JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, 
                null, options, options[0]);
                 Object answer = null; }
{
if ("Hard".equals(answer)) {
        n = Math.random();        
            long n3 = Math.round(Math.random()*99999);
                System.out.println (n3);                        
                    JOptionPane.showMessageDialog(frame, n3 ,"Your randomly generated Number is:" , JOptionPane.PLAIN_MESSAGE) ;

    }else if ("Normal".equals(answer)) {
        h = Math.random();   
            long n4 = Math.round(Math.random()*9999);
                System.out.println (n4);
                    JOptionPane.showMessageDialog(frame, n4 ,"Your randomly generated Number is:" , JOptionPane.PLAIN_MESSAGE) ;                                       

    }else if ("Easy".equals(answer)) {                
        e = Math.random();
            long e4 = Math.round(Math.random()*999);
                System.out.println (e4);
                    JOptionPane.showMessageDialog(frame, e4 ,"Your randomly generated Number is:" , JOptionPane.PLAIN_MESSAGE) ;
            }
        }
    }

what is wrong with it ? I looked trought several Questions here but i couldn't figure it out.