Anything simple I can add to a GUI for some extra credit?

Question

I had to write a GUI for my COMP class this time, and if we add anything extra, we can get some extra points..which would be quite nice.
I have the GUI made and working as we were shown how to do, and now I would like to add some extra things to make it better.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Tuition extends JFrame
    private JLabel stateResL, credsL, typeL, tuitFeeL, actFeeL;
    private JTextField stateResTF, credsTF, typeTF, tuitFeeTF, actFeeTF;
    private JButton calculateB, exitB;
    private CalculateButtonHandler cbHandler;
    private ExitButtonHandler ebHandler;
    public Tuition()
        stateResL = new JLabel ("Is Student a TN State Resident? 1 = yes, 0 = no ", SwingConstants.RIGHT);
        credsL = new JLabel ("Enter number of credits presently being taken: ", SwingConstants.RIGHT);
        typeL = new JLabel ("Is student an undergraduate = 0, or graduate student = 1? ", SwingConstants.RIGHT);
        actFeeL = new JLabel ("Activity Fee: ", SwingConstants.RIGHT);
        tuitFeeL = new JLabel ("Tuition amount owed = $", SwingConstants.RIGHT);
        //text fields
        stateResTF = new JTextField(10);
        credsTF = new JTextField(10);
        typeTF = new JTextField(10);
        actFeeTF = new JTextField(10);
        tuitFeeTF = new JTextField(10);
         //calculate button
        calculateB = new JButton ("Calculate Tuition");
        cbHandler = new CalculateButtonHandler();
        calculateB.addActionListener(cbHandler);
        //exit button
        exitB = new JButton ("Exit");
        ebHandler = new ExitButtonHandler();
        exitB.addActionListener(ebHandler);
        //set title of window
        setTitle("Tuition and extra Fees");
        //get container
        Container pane = getContentPane();
        //set layout
        pane.setLayout (new GridLayout (6, 2));
        //place components in pane
        pane.add (stateResL);
        pane.add (stateResTF);
        pane.add (credsL);
        pane.add (credsTF);
        pane.add (typeL);
        pane.add (typeTF);
        pane.add (tuitFeeL);
        pane.add (tuitFeeTF);
        pane.add (actFeeL);
        pane.add (actFeeTF);
        pane.add (calculateB);
        pane.add (exitB);
        setSize (WIDTH, HEIGHT);
        setVisible (true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    private class CalculateButtonHandler implements ActionListener
        public void actionPerformed (ActionEvent e)
            //computes activity fee and tuition and sets them to respective variables
            double tuition = 0;
            double actFee = 0;
            int credits, stateRes, type;
            type = Integer.parseInt(typeTF.getText());
            stateRes = Integer.parseInt(stateResTF.getText());
            credits = Integer.parseInt(credsTF.getText());
            if (credits >= 6)
                   actFee = 44;
            else
                actFee = 6 * credits;
            if (stateRes == 0)
                    if (type == 1 || type == 0)
                        tuition = ((448 * credits) + actFee);
            else if (stateRes == 1)
                    if (type == 0)
                        tuition = ((241 * credits ) + actFee);
                    else if (type == 1)
                        tuition = ((343 * credits ) + actFee);
                actFeeTF.setText ("" + actFee);
                tuitFeeTF.setText ("" + tuition);
        private class ExitButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e)
                System.exit(0);
}I don't care for something way out of my league (I'm only in my second semester of actually doing "tough" stuff. Maybe something that would change the colors of the text fields where the questions are, or change the color of the font printed, or change the font type, maybe add a logo or something for a school (it's a tuition calculator).
I looked through the API but reading over class names doesn't do much for me, and I searched Google a bit but most of the stuff I found seemed pretty difficult/beyond my knowledge.

Answer 1

alright...I fixed the messy issue, but I don't know how to setup the action listeners or whatever...
I need my calculate tuition method to work using the radio buttons, and I don't know how to set up the listeners correctly.
I can't find a single example on the internet that does anything like what I'm doing that I can use as a reference. I need something using radio buttons that calculates another number based on the results of the radio buttons...like what mine should do.
This has got to be a noob question, but I just can't get it to work....
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Tuition extends JFrame
    private JLabel stateResL, credsL, typeL, tuitFeeL, actFeeL;
    private JTextField stateResTF, credsTF, typeTF, tuitFeeTF, actFeeTF;
    private JButton gradB, calculateB, exitB;
    private CalculateButtonHandler cbHandler;
    private ExitButtonHandler ebHandler;
    private StateResButtonHandler srbHandler;
    private NonStateResButtonHandler nsrbHandler;
    private UndGradButtonHandler ugbHandler;
    private GradButtonHandler gbHandler;
    /** extra */
    JScrollBar scrollbar_h_1;
    JScrollBar scrollbar_v_1;
    JRadioButton undGradRB, gradRB, stateResRB, nonStateResRB;
    ButtonGroup radioGroup1, radioGroup2;
    static String stateResString = "Resident";
    static String nonResString = "Non-Resident";
    static String undGradString = "Undergraduate";
    static String gradString = "Graduate";
    public Tuition()
        getContentPane().setFont(new Font("Arial", Font.ITALIC, 12));
        getContentPane().setBackground(Color.blue);
        stateResL = new JLabel ("Is Student a TN State Resident? ", SwingConstants.RIGHT);
        credsL = new JLabel ("Enter number of credits presently being taken: ", SwingConstants.RIGHT);
        typeL = new JLabel ("Is student an undergraduate, or graduate student? ", SwingConstants.RIGHT);
        actFeeL = new JLabel ("Activity Fee: ", SwingConstants.RIGHT);
        tuitFeeL = new JLabel ("Tuition amount owed = $", SwingConstants.RIGHT);
        //text fields
        credsTF = new JTextField(10);
        actFeeTF = new JTextField(10);
        tuitFeeTF = new JTextField(10);
         //calculate button
        calculateB = new JButton ("Calculate Tuition");
        cbHandler = new CalculateButtonHandler();
        calculateB.addActionListener(cbHandler);
        //exit button
        exitB = new JButton ("Exit");
        ebHandler = new ExitButtonHandler();
        exitB.addActionListener(ebHandler);
        radioGroup1 = new ButtonGroup();
        JRadioButton stateResButton = new JRadioButton(stateResString);
        stateResButton.setMnemonic(KeyEvent.VK_B);
        stateResButton.setActionCommand(stateResString);
        stateResButton.setSelected(true);
        JRadioButton nonResButton = new JRadioButton(nonResString);
        nonResButton.setMnemonic(KeyEvent.VK_B);
        nonResButton.setActionCommand(nonResString);
        radioGroup1.add (stateResButton);
        radioGroup1.add (nonResButton);
        radioGroup2 = new ButtonGroup();
        JRadioButton undGradButton = new JRadioButton(undGradString);
        undGradButton.setMnemonic(KeyEvent.VK_B);
        undGradButton.setActionCommand(undGradString);
        undGradButton.setSelected(true);
        JRadioButton gradButton = new JRadioButton(gradString);
        gradButton.setMnemonic(KeyEvent.VK_B);
        gradButton.setActionCommand(gradString);
        radioGroup2.add(undGradButton);
        radioGroup2.add(gradButton);
        srbHandler = new StateResButtonHandler();
        stateResButton.addActionListener(stateResString);
        nrbHandler = new NonResButtonHandler();
        nonResButton.addActionListener(nonResString);
        ugbHandler = new UndGradButtonHandler();
        undGradButton.addActionListener(undGradString);
        gbHandler = new GradButtonHandler();
        gradButton.addActionListener(gradString);
        //set title of window
        setTitle("Tuition and extra Fees");
        //get container
        Container pane = getContentPane();
        //set layout
        pane.setLayout (new GridLayout (6, 2));
        JPanel radioPanel = new JPanel(new GridLayout(0, 1));
        radioPanel.add(stateResButton);
        radioPanel.add(nonResButton);
         JPanel radioPanel2 = new JPanel(new GridLayout(0, 1));
         radioPanel2 = new JPanel (new GridLayout(0, 1));
         radioPanel2.add (undGradButton);
         radioPanel2.add (gradButton);
        //place components in pane
        pane.add (stateResL);
        add(radioPanel);
        pane.add (credsL);
        pane.add (credsTF);
        pane.add (typeL);
        add(radioPanel2);
        pane.add (actFeeL);
        pane.add (actFeeTF);
        pane.add (tuitFeeL);
        pane.add (tuitFeeTF);
        pane.add (calculateB);
        pane.add (exitB);
        setSize (WIDTH, HEIGHT);
        setVisible (true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        /** EXTRA - EXTRA - EXTRA */
        calculateB.setToolTipText("Click this button to calculate tuition and activity fee.");
        exitB.setToolTipText("Click this button to exit the program.");
    private class CalculateButtonHandler implements ActionListener
        public void actionPerformed (ActionEvent e)
            //computes activity fee and tuition and sets them to respective variables
            double tuition = 0;
            double actFee = 0;
            int credits, stateRes, type;
            type = Integer.parseInt(typeTF.getText());
            stateRes = Integer.parseInt(stateResTF.getText());
            credits = Integer.parseInt(credsTF.getText());
            if (credits >= 6)
                   actFee = 44;
            else
                actFee = 6 * credits;
            if (stateRes == 0)
                    if (type == 1 || type == 0)
                        tuition = ((448 * credits) + actFee);
            else if (stateRes == 1)
                    if (type == 0)
                        tuition = ((241 * credits ) + actFee);
                    else if (type == 1)
                        tuition = ((343 * credits ) + actFee);
                actFeeTF.setText ("" + actFee);
                tuitFeeTF.setText ("" + tuition);
        private class ExitButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e)
                System.exit(0);
        private class StateResButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e){
        private class NonStateResButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e){
        private class UndGradButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e) {
        private class GradButtonHandler implements ActionListener
            public void actionPerformed (ActionEvent e) {
}the calculateB and exitB listeners work, but I have nothing setup for the others that works. And the calculate button doesn't work because it isn't getting any info from the buttons.
I get addActionListener(Java.awt.event.ActionListener) in Javax.swing.AbstractButton cannot be applied to (java.lang.String). on the listeners I attempted to add within the constructor....