add conponents to panel

[thashi]

how to add components to the panel on the fly
following code is not work
JButton b=new JButton("hjkhk");
jPanel3.add(b);
setContentPane(jPanel3);

I hope your help

[r035198x]

how to add components to the panel on the fly
following code is not work
JButton b=new JButton("hjkhk");
jPanel3.add(b);
setContentPane(jPanel3);

I hope your help

Don't set the contentPane to be the panel. Instead use

getContentPane().add(jPanel3);

[JosAH]

Don't set the contentPane to be the panel. Instead use

getContentPane().add(jPanel3);

As a matter of fact setting the content pane to a JPanel does work. All the JFrame
wants is that its content pane should be a JComponent and it must be opaque.

The JFrame's add() method delegates to its content pane's add() method and all
JComponents have such a method (inherited from the Container class), so there's
no problem here.

You could wonder why to create a JPanel in the first place because the original
content pane is a JComponent and thus a Container (with a BorderLayout) so it
can do the job as well.

kind regards,

Jos

[r035198x]

As a matter of fact setting the content pane to a JPanel does work. All the JFrame
wants is that its content pane should be a JComponent and it must be opaque.

The JFrame's add() method delegates to its content pane's add() method and all
JComponents have such a method (inherited from the Container class), so there's
no problem here.

You could wonder why to create a JPanel in the first place because the original
content pane is a JComponent and thus a Container (with a BorderLayout) so it
can do the job as well.

kind regards,

Jos

I just thought they may want other panels to appear together with that panel (judging from the variable names they have).
The setContentPane is certainly not the reason why their code "is not work".