JTextArea始终显示垂直滚动条，为什么？

Question

new JScrollPane(originalText, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER)

I clearly write "as needed," but the scrollbar appears anyway in the blank JTextArea. Why? How can I prevent this?

Answer 1

The code you have given is wrong. Jscrollpane doesn't have a constructor like you have mentioned. I think it should be JTextArea instead.

And the answer for your question lies in your parent layout. Please post your layout structure. In general, trying to change your parent's layout to FlowLayout/BorderLayout should show you different results.

Answer 2

It could be if you specified rows argument in the JTextArea constructor. So the area preferred height is bigger than JScrollPane's height and the vertical scroll is needed.