JPanel is automatically resized

[Roberto De Giuli]

Hello.
I've been writing a simple swing application. The main JFrame window has a BorderLayout:

this.getContentPane().setLayout(new BorderLayout());

I've added a JPanel to my top level JFrame container:

getContentPane().add(pannelloBtn, BorderLayout.WEST);

where "pannelloBtn" is my JPanel.
The JPanel code for "pannelloBtn" is located in a custom class that extends JPanel. In the constructor I've added the following code:

super(new BorderLayout());
this.setMinimumSize(new Dimension(400, 600));
this.setSize(new Dimension(400, 600));
this.setBorder(BorderFactory.createLineBorder(Color.black));

Now I have a problem: when I run the application the JPanel's width is resized to zero, even if I've specified a minimun width of 400.
I can't solve it: any help is more than welcome. Thank you very much!

Roberto

[Tony Docherty]

BorderLayout lays out components based on their preferred size so try setting the preferred size of the panel.

[Roberto De Giuli]

Tony Docherty wrote:BorderLayout lays out components based on their preferred size so try setting the preferred size of the panel.

Thank you very much, now it works!

[Tony Docherty]

My pleasure