是否可以只在顶部有一个java swing边框？

Question

我知道如何使用BorderFactory创建边框，但我没有看到任何可以指定我想要边框的边：S

Answer 1

You can use the MatteBorder to specify the dimensions of the border in each side. The constructor of MatteBorder is:

public MatteBorder(int top,
                   int left,
                   int bottom,
                   int right,
                   Color matteColor)

So if you want to have a border only on the bottom and right sides of your JPanel , you could write something like this:

JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createMatteBorder(0, 0, 1, 1, Color.BLACK));

Answer 2

From Sun tutorial :

The next picture shows some matte borders. When creating a matte border, you specify how many pixels it occupies at the top, left, bottom, and right of a component.

( Java docs )

Answer 3

Matte and empty border allow you to specify the sizes on each side, which may be zero.

The Border interface itself is quite easy to implement yourself if you want a custom look. I guess there may be third party libraries available containing styles not included within the Java library.

Answer 4

text_field.setBorder( new MatteBorder(2, 0, 0, 0, Color.black));

值可以相应地改变。