Question

I am new to java swing. I have pasted my code below for your reference,

I am trying to create 2 JRadioButtons in JFrame and if i click that JRadioButton it
should display 5 JCheckboxes for each JRadioButton in the same JFrame.

JRadiobutton is displaying now but if i click that JRadioButton "JCheckboxes" is not
displaying. please see my code below, if any changes need in my code, please do
accordingly.i am struggling for this.

MultipleFramesExample.java calling createMainView() in Mainview.java class

public class MultipleFramesExample extends JFrame {

 public  void fun()
 {

  MainView MV = new MainView();
  MV.createMainView();
 }

 public static void main(String[] args) {
   MultipleFramesExample ob=new MultipleFramesExample();
   ob.fun();
 }
}

Mainview.java creates Jframe and Buttons etc..

    public class MainView extends JFrame implements ActionListener  {

     JFrame frame1;
     MainView mV=null;
     JCheckBox chinButton;
     JRadioButton birdButton;
    MultipleFramesExample ob=new MultipleFramesExample();
  JPanel panel = new JPanel(new BorderLayout());

  public void createMainView() {
  mV = new MainView();

  frame1 = new JFrame();
  frame1.setTitle("Main View");
  frame1.setSize(50,50);
  frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame1.setVisible(true);
   birdButton = new JRadioButton("click");
  frame1.getContentPane().add(birdButton);
  birdButton.addActionListener(this);

 }

  public void actionPerformed(ActionEvent event) {
    Container contentPane = frame1.getContentPane();
   contentPane.setLayout(new FlowLayout());

    JCheckBox jb=new JCheckBox();
    if (event.getActionCommand().equals(birdButton)) {

   frame1.add(new JCheckBox("JIL1"));
   frame1.add(new JCheckBox("JIL2"));
   frame1.add(new JCheckBox("JIL3"));
   frame1.add(new JCheckBox("JIL4"));
   frame1.add(new JCheckBox("JIL5"));
   frame1.setVisible(true);

   //panel.add(jb, BorderLayout.PAGE_START);

  // panel.getComponentCount();
     }
   }
 public void fun1(){

 }
}

Is it possible to create them like this?

Answer 1

Update: Here’s a working example:

public class MainView extends JFrame implements ActionListener{
    JRadioButton radioButton1 = new JRadioButton("Button 1");
    JRadioButton radioButton2 = new JRadioButton("Button 2");
    JCheckBox checkBox = new JCheckBox("CheckBox");
    ButtonGroup buttonGroup = new ButtonGroup();

    public MainView() {
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setSize(300, 100);
        setLayout(new GridLayout());

        buttonGroup.add(radioButton1);
        buttonGroup.add(radioButton2);
        radioButton1.addActionListener(this);
        radioButton2.addActionListener(this);
        radioButton2.setSelected(true);  // remove to have no button selected

        // ActionListener for CheckBox
        checkBox.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO: Your action here
            }
        });

        getContentPane().add(radioButton1);
        getContentPane().add(radioButton2);
        getContentPane().add(checkBox);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        checkBox.setVisible(radioButton2.isSelected());
    }

    public static void main(String[] args) {
        new MainView();
    }
}

---

Original post

You have some problems with your code:

1. You create new JCheckBoxes whenever the button is clicked. If the user clicks it twice, more checkboxes would be created.
2. You try to add two checkboxes:
   frame1.add(new JCheckBox("JIL"));
frame1.getContentPane().add(jb);

Try the following steps:

1. Create and add all objects that you need for testing (JRadioButton, JCheckBox) and make sure that they are both displayed (check Using Layout Managers and A Visual Guide to Layout Managers if you add both but do not see both).

2. In your ActionListener, use something like checkBox.setVisible(radioButton.isSelected()) to switch visibility of your checkBox according to the state of your radioButton.