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  1. #1
    HellRider is offline Member
    Join Date
    Feb 2010
    Posts
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    Default checkbox question

    hi all, I would like to ask how to make the following code , so when the button is pressed to display which checkbox are selected, thank you very much :).

    Java Code:
    import java.awt.BorderLayout;
    import java.awt.Container;
    import java.awt.GridLayout;
    
    import javax.swing.BorderFactory;
    import javax.swing.JButton;
    import javax.swing.JCheckBox;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.border.Border;
    
    public class ACheckBox {
      public static void main(String args[]) {
        String title = (args.length == 0 ? "CheckBox Sample" : args[0]);
        JFrame frame = new JFrame(title);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel(new GridLayout(0, 1));
        Border border = BorderFactory.createTitledBorder("Pizza Toppings");
        panel.setBorder(border);
        JCheckBox check = new JCheckBox("Anchovies");
        panel.add(check);
        check = new JCheckBox("Garlic");
        panel.add(check);
        check = new JCheckBox("Onions");
        panel.add(check);
        check = new JCheckBox("Pepperoni");
        panel.add(check);
        check = new JCheckBox("Spinach");
        panel.add(check);
        JButton button = new JButton("Submit");
        Container contentPane = frame.getContentPane();
        contentPane.add(panel, BorderLayout.CENTER);
        contentPane.add(button, BorderLayout.SOUTH);
        frame.setSize(300, 200);
        frame.setVisible(true);
      }
    }

  2. #2
    zweibieren is offline Senior Member
    Join Date
    Aug 2009
    Location
    Pittsburgh, PA
    Posts
    284
    Rep Power
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    Default

    You will want an ItemListener.
    The tutorial How to use Checkboxes hints at this, but is not clear.
    Here is how to do it with an anonymous listener:
    Java Code:
        check = new JCheckBox("Spinach");
        panel.add(check);
        check.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.DESELECTED) {
                    // "Spinach" has been clicked off, process it
                }
                else { 
                    // "Spinach" has been clicked ON, process it
                }
            }
        });

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