Re: clone/copy JLabel & JComboBox objects

From:

albert kao <albertkao3@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 4 Mar 2011 06:36:37 -0800 (PST)

Message-ID:

<587e8c76-85f3-4539-b920-4643372ce9c8@j35g2000prb.googlegroups.com>

On Mar 3, 9:05 pm, Eric Sosman <esos...@ieee-dot-org.invalid> wrote:

On 3/3/2011 5:04 PM, albert kao wrote:

Is there a way to clone/copy JLabel& JComboBox objects?

They cannot be cloned in the sense of clone(). As for copyi=

ng,

it depends what you mean by "copy."

The larger question, I think, is "Why do you want duplicates?"
For a JLabel I can almost see it: If you've got a UI with lots and
lots of repetitive text, you might try to re-use "the same" JLabel in
many different positions simultaneously. But I think it's a rare (and
over-busy) UI that will clutter itself with fifty occurrences of the
same label! Just make N JLabels, all with the same text, and be
prepared for unenthusiastic reviews ...

Duplicating a JComboBox makes no sense at all to me. Why in=

the

world would you want N identical combo boxes, all manipulating the
exact same ComboBoxModel and hence the same "setting object" -- well,
I can't think why you'd want this. Please explain.

--
Eric Sosman
esos...@ieee-dot-org.invalid

I want to make the same Swing component (e.g JLabel) appear in
different tabs of a JTabbedPane.
e.g. I want to make label4 to appear in both panel1/tab1 and panel2 in
the following test program.
I am still experimenting (by cloning JLabel, etc) to make it work.
Please help.
public class TestPanel extends JPanel {
  JFrame frame = new JFrame();
  Container container = frame.getContentPane();
  JTabbedPane tabPane = new JTabbedPane();

  GridBagLayout gbl = new GridBagLayout();
  container.setLayout(gbl);

  GridBagConstraints c = new GridBagConstraints();

  JPanel panel1 = new JPanel(new GridBagLayout());
  JPanel panel2 = new JPanel(new GridBagLayout());

  String s = "copy";
  JLabel label = new JLabel(s);

  c.gridx = 0;
  c.gridy = 0;
  panel1.add(label, c); // appear in tab 2

  JLabel label2 = new JLabel(label.getText());
  JLabel label3 = new JLabel("label3");
  JLabel label4 = new JLabel("label4");

  c.gridy = 1;
  panel2.add(label3, c);
  c.gridy = 2;
  panel2.add(label, c);
  c.gridy = 3;
  panel2.add(label2, c); // appear in panel2

  c.gridy = 4;
  panel2.add(label4, c); // do not appear in panel2
  panel1.add(label4, c); // appear in panel1

  tabPane.add(panel1, "1");
  tabPane.add(panel2, "2");
  container.add(tabPane);
  frame.pack();
  frame.setVisible(true);
}

Thanks.