如何为JPanel添加空间，以使JScrollPane不在组件的顶部？

Question

I have a JScrollPane and when I load my application the bar is sitting on top of one of my buttons. What I would like to do is add some space to the side of my button so that the scroll bar draws over the space and not my button.

Example code that I tried:

JPanel eButton = new JPanel(new BorderLayout());
JPanel spaceFiller = new JPanel();
spaceFiller.setSize(30, 10);
eButton.add(editButton, BorderLayout.EAST);
eButton.add(spaceFiller, BorderLayout.WEST);

The problem with this code is that it still overwrites my button and no space is added. What is the best way to make sure that JScrollPane doesn't overlap the components in my JFrame?

Thanks

Answer 1

为了确保尊重JPanel的大小，您应该使用setPreferredSize（）而不是setSize（）。

Answer 2

In your sample code, didn't you reverse EAST and WEST? Shouldn't it be like:

eButton.add(editButton, BorderLayout.WEST); 
eButton.add(spaceFiller, BorderLayout.EAST); 

That would make more sense, sicne the scrollbar will appear on the right side (EAST).

Please note that the solution you suggest, even though it may work (after exchanging EAST and WEST) looks more like a hack than a real solution.