Java guessing game
<p>I am trying to write a program in Java that takes a random number from 1-1000 and then as the guess it the background color changes to blue(cold) or red(warm) if they are in the number. I am new to java GUI, but I think the rest of the logic is right, not sure. It compiles, but the guess button doesn't work. Any guidance will be appreciated. </p>

<pre><code>package guessGame;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.color.*;
import java.util.Random;


import java.util.Random;
import java.util.logging.FileHandler;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class GuessGame extends JFrame
{
    private JFrame mainFrame;
    private JButton GuessButton;
    private JButton QuitButton;
    private JLabel prompt1, prompt2;
    private JTextField userInput;
    private JLabel comment = new JLabel("What is your destiny?");
    private JLabel comment2 = new JLabel (" ");
    //private int number, guessCount;
    //private int lastGuess;
    private int randomNumber;
    private Color background;


    public GuessGame()
    {
        mainFrame = new JFrame ("Guessing Game!");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Creates components
        GuessButton = new JButton("Guess");
        QuitButton  = new JButton("Quit");
        prompt1 = new JLabel("I have a number between 1 and 1000.");
        prompt2 = new JLabel("Can you guess my number? Enter your Guess:");
        comment = new JLabel ("What is your destiny?");
        comment2 = new JLabel (" ");
        userInput = new JTextField(5);
        //userInput.addActionListener(new GuessHandler());

        //content pane
        Container c = mainFrame.getContentPane();
        c.setLayout(new FlowLayout());

        //adding component to the pane
        c.add(prompt1);
        c.add(prompt2);
        c.add(userInput);
        c.add(comment2);
        c.add(GuessButton);
        c.add(QuitButton);
        c.add(comment);

        GuessButton.setMnemonic('G');
        QuitButton.setMnemonic('Q');

        mainFrame.setSize(300,200);
        mainFrame.setLocationRelativeTo(null);
        mainFrame.setVisible(true);
        mainFrame.setResizable(false);

        // define and register window event handler
    //  mainFrame.addWindowListener(new WindowAdapter() {
    //      public void windowClosing(WindowEvent e) 
    //      { System.exit(0); }
    //  });

        //creating the handler
        GuessButtonHandler ghandler = new GuessButtonHandler(); //instantiate new object
        GuessButton.addActionListener(ghandler); // add event listener

        QuitButtonHandler qhandler = new QuitButtonHandler(); 
        QuitButton.addActionListener(qhandler); 



    }

    public void paint (Graphics g)
    {
        super.paint(g);
        setBackground(background);
    }

    class QuitButtonHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            System.exit(0);
        }
    }

    class GuessButtonHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            int getUserInput=0;
            int diff;
            int Difference;
            randomNumber = new Random().nextInt(1001);
            try {
                getUserInput = Integer.parseInt(
                        userInput.getText().trim());
            } catch (NumberFormatException ex){
                comment.setText("Enter a VALID number!");
                return;
            }
            if (getUserInput == randomNumber){
                JOptionPane.showMessageDialog(null, "CONGRATULATIONS! You got it!!",
                        "Random Number: " + randomNumber, 
                        JOptionPane.INFORMATION_MESSAGE);
                randomNumber = new Random().nextInt(1000) + 1;
                return;
            }
            if (getUserInput &gt; randomNumber){
                comment.setText( "Too High. Try a lower number." );
                diff=getUserInput - randomNumber;
                Difference=Math.abs(diff);
            } else {
                comment.setText( "Too Low. Try a higher number." );
                diff=randomNumber - getUserInput;
                Difference=Math.abs(diff);
            }

            if(Difference&lt;=25){
                comment2.setText("Cold");
                setBackgroundColor(Color.blue);
            }

            if(Difference&lt;=10){
                comment2.setText("Warm");
                setBackgroundColor(Color.red);
            }

            else {
            }
        }
        private void setBackgroundColor(Color color) {
               setBackgroundColor(color);
            }
    }


    public static void main(String args[]) {
        //instantiate gueesgame object
        GuessGame app = new GuessGame();

    }
}
</code></pre>
