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POReferencing JRadioButtons in ActionListener
 

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  1. POReferencing JRadioButtons in ActionListener
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    <p>I am trying to write a GUI that displays a hex value and it's associated color based on whichever JRadioButton is selected. My ActionListener looks up a hashMap entry that stores the individual radio buttons as an object key and it's associated hex value (as a string).</p> <p>I can get the hex values with the hashMap.get pieces, but how do I get the action listener to reference any JRadioButton rather than just 'jrbBlue' or whatever is hard-coded? </p> <p>Eclipse doesn't like it if I put JRadioButton.addActionListener(Error - "Cannot make a static reference to the non-static method addActionListener(ActionListener) from the type AbstractButton") or jpRadioButton.addActionListener, my JPanel for the buttons (it wants to change addActionListener to addComponentListener and a bunch of other addWhatevers, none of which work).</p> <p>I realize there are other ways to write this whole thing, but I'm tying to work with what I have and I'm still learning.</p> <p>Thanks in advance.</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import javax.swing.border.*; public class Colors extends JFrame { static Map&lt;Object, String&gt; hashMap = new HashMap&lt;Object, String&gt;(); String hex = "Hex Value"; //---- The JLabel message (hex value of the color selected) private JLabel jlblMessage = new JLabel(hex, JLabel.CENTER); //---- Create the radio buttons private static JRadioButton jrbBlue = new JRadioButton("Blue"); private static JRadioButton jrbPurplish = new JRadioButton("Purplish"); private static JRadioButton jrbRed = new JRadioButton("Red"); private static JRadioButton jrbYellow = new JRadioButton("Yellow"); private static JRadioButton jrbGreen = new JRadioButton("Green"); private static JRadioButton jrbOrange = new JRadioButton("Orange"); private static JRadioButton jrbCyan = new JRadioButton("Cyan"); private static JRadioButton jrbCoral = new JRadioButton("Coral"); private static JRadioButton jrbFuscia = new JRadioButton("Fuscia"); private static JRadioButton jrbViolet = new JRadioButton("Violet"); private static JRadioButton jrbDodgerBlue = new JRadioButton("Dodger Blue"); private static JRadioButton jrbGrey = new JRadioButton("Grey"); private static JRadioButton jrbWhite = new JRadioButton("White"); private static JRadioButton jrbCrimson = new JRadioButton("Crimson"); private static JRadioButton jrbDarkOrchid = new JRadioButton("Dark Orchid"); private static JRadioButton jrbFirebrick = new JRadioButton("Firebrick"); private static JRadioButton jrbHotPink = new JRadioButton("Hot Pink"); private static JRadioButton jrbMaroon = new JRadioButton("Maroon"); private static JRadioButton jrbDarkBlue = new JRadioButton("Dark Blue"); private static JRadioButton jrbTurquoise = new JRadioButton("Turquoise"); public Colors() { //---- JLabel placement jlblMessage.setBorder(new LineBorder(Color.BLACK, 2)); add(jlblMessage, BorderLayout.CENTER); //---- Add the radio buttons to the JPanel JPanel jpRadioButtons = new JPanel(); jpRadioButtons.setLayout(new GridLayout(3, 1)); jpRadioButtons.add(jrbBlue); jpRadioButtons.add(jrbPurplish); jpRadioButtons.add(jrbRed); jpRadioButtons.add(jrbYellow); jpRadioButtons.add(jrbGreen); jpRadioButtons.add(jrbOrange); jpRadioButtons.add(jrbCyan); jpRadioButtons.add(jrbCoral); jpRadioButtons.add(jrbFuscia); jpRadioButtons.add(jrbViolet); jpRadioButtons.add(jrbDodgerBlue); jpRadioButtons.add(jrbGrey); jpRadioButtons.add(jrbWhite); jpRadioButtons.add(jrbCrimson); jpRadioButtons.add(jrbDarkOrchid); jpRadioButtons.add(jrbFirebrick); jpRadioButtons.add(jrbHotPink); jpRadioButtons.add(jrbMaroon); jpRadioButtons.add(jrbDarkBlue); jpRadioButtons.add(jrbTurquoise); add(jpRadioButtons, BorderLayout.WEST); //---- Add all the buttons to the same group ButtonGroup group = new ButtonGroup(); group.add(jrbBlue); group.add(jrbPurplish); group.add(jrbRed); group.add(jrbYellow); group.add(jrbGreen); group.add(jrbOrange); group.add(jrbCyan); group.add(jrbCoral); group.add(jrbFuscia); group.add(jrbViolet); group.add(jrbDodgerBlue); group.add(jrbGrey); group.add(jrbWhite); group.add(jrbCrimson); group.add(jrbDarkOrchid); group.add(jrbFirebrick); group.add(jrbHotPink); group.add(jrbMaroon); group.add(jrbDarkBlue); group.add(jrbTurquoise); //jrbBlue.setSelected(true); //jlblMessage.setForeground(Color.decode("#0000FF")); //---- Action Listener jrbBlue.addActionListener(new ActionListener() { //&lt;---- How to Reference whichever button is selected? @Override public void actionPerformed(ActionEvent e) { jlblMessage.setForeground(Color.decode("#000000")); jlblMessage.setText(hashMap.get((JRadioButton)e.getSource())); getContentPane().setBackground(Color.decode(hashMap.get((JRadioButton)e.getSource()))); } }); } public static void main(String[] args) { Colors frame = new Colors(); frame.pack(); frame.setTitle("Colors"); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame.setSize(900,300); //---- Color library map hashMap.put(jrbBlue, "#0000FF"); hashMap.put(jrbPurplish, "#DF01D7"); hashMap.put(jrbRed, "#FF0000"); hashMap.put(jrbYellow, "#FFFF00"); hashMap.put(jrbGreen, "#00FF00"); hashMap.put(jrbOrange, "#FF8C00"); hashMap.put(jrbCyan, "#00FFFF"); hashMap.put(jrbCoral, "#FF7F50"); hashMap.put(jrbFuscia, "#FF00FF"); hashMap.put(jrbViolet, "#00FF00"); hashMap.put(jrbDodgerBlue, "#1E90FF"); hashMap.put(jrbGrey, "#C0C0C0"); hashMap.put(jrbWhite, "#FFFFFF"); hashMap.put(jrbCrimson, "#DC143C"); hashMap.put(jrbDarkOrchid, "#9932CC"); hashMap.put(jrbFirebrick, "#B22222"); hashMap.put(jrbHotPink, "#FF69B4"); hashMap.put(jrbDarkBlue, "#00008B"); hashMap.put(jrbMaroon, "#800000"); hashMap.put(jrbTurquoise, "#48D1CC"); } } </code></pre>
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