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    <p>I am required me to use RadioButtons and Checkboxes in my Java program so the user can easily select the options they would like to use (It is a "gas station").</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; public class New_Gas_Bar extends JFrame { public JPanel panel1,panel2,panel3,panel4,panel5; public JLabel main1, main2, main3; public JLabel gasBar,total; public JButton button1,button2,button3,button4; public JRadioButton bronzeG,silverG,goldG,selfS,fullS,fullService,selfService; public JCheckBox oilC,windWash,windClean; static double fullCost,selfCost; public New_Gas_Bar() { super (" New Gas Bar"); setSize(640,640); Container container = getContentPane(); panel1=new JPanel(); panel2=new JPanel(); panel1.setBackground(new Color(107,202,226)); panel1.setLayout(new GridLayout(7,1)); main1 = new JLabel (" Gas Bar Project "); main2 = new JLabel (" ICS4U0 - September 2013"); main3 = new JLabel (" "); button1 = new JButton ("Gas Station"); button2 = new JButton ("Car Wash"); button3 = new JButton ("Total"); button4 = new JButton ("Exit"); panel2.setBackground(new Color(144,160,170)); panel2.setLayout(new GridLayout(4,1)); panel2.add (button1); panel2.add (button2); panel2.add (button3); panel2.add (button4); panel1.add (main1); panel1.add (main2); //panel2.add(gasBar); //panel3.add(total); container.setLayout(new BorderLayout()); container.add(panel1,BorderLayout.NORTH); container.add(panel2,BorderLayout.CENTER); ButtonHandler handler = new ButtonHandler (); button1.addActionListener (handler); button2.addActionListener (handler); button3.addActionListener (handler); button4.addActionListener (handler); ButtonGroup serveStyle = new ButtonGroup(); fullS = new JRadioButton ("Full Serve"); selfS = new JRadioButton ("Self Serve"); serveStyle.add (fullS); serveStyle.add (selfS); ButtonGroup serveGas = new ButtonGroup(); bronzeG = new JRadioButton("Bronze Service"); silverG = new JRadioButton("Silver Service"); goldG = new JRadioButton("Gold Service"); serveGas.add (bronzeG); serveGas.add (silverG); serveGas.add (goldG); oilC = new JCheckBox("Oil Change"); windWash = new JCheckBox("Windshield Wash"); windClean = new JCheckBox("Windshield Cleaning"); RadioButtonHandler radioHand = new RadioButtonHandler (); bronzeG.addItemListener (radioHand); CheckBoxHandler checkHand = new CheckBoxHandler(); oilC.addItemListener (checkHand); setVisible(true); pack(); } public static void main (String [] args) { New_Gas_Bar application = new New_Gas_Bar(); } public class ButtonHandler implements ActionListener { public void actionPerformed (ActionEvent event) { if (event.getSource () == button1) { panel1.setVisible(true); panel2.setVisible(false); panel3.setVisible(true); panel4.setVisible(false); panel5.setVisible(false); } else if (event.getSource () == button2) { } else if (event.getSource () == button3) { } else if (event.getSource () == button4) { System.exit(0); } } } public class RadioButtonHandler implements ActionListener { public void actionPerformed (ActionEvent event) { if (event.getSource () == fullS) { } else if (event.getSource () == selfS) { } if (event.getSource () == bronzeG) { } else if (event.getSource () == silverG) { } else if (event.getSource () == goldG) { } } } public class CheckBoxHandler implements ActionListener { public void actionPerformed (ActionEvent event) { if (event.getSource () == checkBox1) { } else if (event.getSource () == checkBox2) { } else if (event.getSource () == checkBox3) { } } } } } </code></pre> <p>The error I am getting is at this part</p> <pre><code>RadioButtonHandler radioHand = new RadioButtonHandler (); bronzeG.addItemListener (radioHand); CheckBoxHandler checkHand = new CheckBoxHandler(); oilC.addItemListener (checkHand); </code></pre> <p>I do not understand why at <code>bronzeG.addItemListener</code>, it says </p> <pre><code>addItemListener(java.awt.event.ItemListener) in javax.swing.AbstractButton cannot be applied to (New_Gas_Bar.RadioButtonHandler) </code></pre>
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