how to remove the borders in JInternalFrame?

i was able to remove the title bar from the 开发者_StackOverflow中文版JInternalFrame but i don't know how to remove the borders.

To remove the border simply call frame.setBorder(null);

Any border that is null is simply not shown.

To remove all borders, simply call:

this.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));