Question

i am having little difficulty here with disabling/enabling few JComponents with a checkbox in run-time. I have tried to do if(checkbox.isSelected(){} but it didn’t worked. When i try to add addActionListener(this) i get an error “method addActionListiner in class AbstractButton cannot be applied to given types : required Action listiner: found JudgeMain (its a class name) – leaking “this” in constructor

public class JudgeMain extends JFrame {
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
LogInJ id = new LogInJ();
public String IdNumber;
public JudgeMain(LogInJ id) 
{
    initComponents();
    ButtonGroup();
    this.id = id;
    initDetails();
    yesCB.addActionListener(this);
    if(yesCB.isSelected())
    {
        timeF.setEnabled(true);
        catF.setEnabled(true);
        yearsCB.setEnabled(true);
        monthsCB.setEnabled(true);            
    }
}

help appreciated thank you

Answer 1

The class JudgeMain does not represent the type ActionListener.

You would need to implement this interface to make it possible to call

yesCB.addActionListener(this);

or just use an anonymous listener (Note, no need to check the source):

yesCB.addActionListener(new ActionListener() {

   @Override
   public void actionPerformed(ActionEvent e) {
      timeF.setEnabled(yesCB.isSelected());
      catF.setEnabled(yesCB.isSelected());
      yearsCB.setEnabled(yesCB.isSelected());
      monthsCB.setEnabled(yesCB.isSelected());
}});

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Side Note: The preferred approach is to create an instance of JFrame and use directly rather than subclassing the class.