JComboBox width

Question

I have created a jComboBox but it takes the full width of the frame. how to set the width fixed.

yes borderlayout for the frame and box layout for the panel. i am

Answer 1

The width is automatically determined by the width of the largest item added to the combo box. You can control the display by using:

comboBox.setPrototypeDisplayValue("text here");

You might also consider using the Combo Box Popup to control the popup size.

Edit:

Since you added code that shows you are using a BoxLayout you can try the following:

comboBox.setMaximumSize( comboBox.getPreferredSize() );

Or you can do something like:

JPanel wrapper = new JPanel();
wrapper.add( comboBox );
panel.add( wrapper );

Read the section from the Swing tutorial on Using Layout Managers to understand how these suggestions work.