The getSource() method in an action listener does not recognize the buttons i'm referring to

Question

all, I'm a newbie to Java and I'm working on the Lab 12 on the Java textbook, Starting out with Java (Ed.5).

After written the code for constructor, I have created a method to build a panel and add some radio buttons to it. I have registered these radio buttons to an Action Listener called RadioButtonListener. Then I wrote an inner class for RadioButtonListener.

Here is the problem, as I used the getSource() method to determine which button is clicked, the compiler does not recognize the button I indicated.

Here is my coding:

private void buildBottomPanel()
{
    bottomPanel = new JPanel();

    JRadioButton greenButton = new JRadioButton("Green");

    JRadioButton blueButton = new JRadioButton("Blue");

    JRadioButton cyanButton = new JRadioButton("Cyan");

    ButtonGroup bottomButtonGroup = new ButtonGroup();
    bottomButtonGroup.add(greenButton);
    bottomButtonGroup.add(blueButton);
    bottomButtonGroup.add(cyanButton);

    greenButton.addActionListener(new RadioButtonListener());
    blueButton.addActionListener(new RadioButtonListener());
    cyanButton.addActionListener(new RadioButtonListener());

    bottomPanel.add(greenButton);
    bottomPanel.add(blueButton);
    bottomPanel.add(cyanButton);
}

private class RadioButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent f)
    {
        if (f.getSource() == greenButton)
        {
            messageLabel.setForeground(Color.GREEN);
        }
        else if (f.getSource() == blueButton)
        {
            messageLabel.setForeground(Color.BLUE); 
        }
        else if (f.getSource() == cyanButton)
        {
            messageLabel.setForeground(Color.CYAN);
        }
    }
}

Answer 1

try to use getActionCommand() instead of getSource() as Below :-

if (f.getActionCommand().equals("green"))
        {
            messageLabel.setForeground(Color.GREEN);
        }

or you can use anonymous inner classes as below :-

 greenButton.addActionListener(new ActionListener(){ 
            @Override
            public void actionPerformed(ActionEvent e)
            {

              messageLabel.setForeground(Color.GREEN);

            }
        });