Is it possible to have a java swing border only on the top side?

I know how to create borders using BorderFactory but I don't see any开发者_开发知识库thing that lets me specify what sides I want the border on :S

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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));

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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)

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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.

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

The values can be varied accordingly.