Java - 有按钮显示箭头

Question

I would like to have a buttons in Java which shows the arrows - like on the keyboard. So far I have this

JButton arrowUp = new JButton("^");
JButton arrowDown = new JButton("v");
JButton arrowLeft = new JButton("<");
JButton arrowRight = new JButton(">");

It kinda works ... but does not look quite nice.

Any help how to improve this is appreciated

Answer 1

Swing has a default arrow button class that is BasicArrowButton

Example:

    JFrame frame = new JFrame("Arrow Button Demo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());
    frame.add(new BasicArrowButton(BasicArrowButton.EAST), BorderLayout.EAST);
    frame.add(new BasicArrowButton(BasicArrowButton.NORTH), BorderLayout.NORTH);
    frame.add(new BasicArrowButton(BasicArrowButton.SOUTH), BorderLayout.SOUTH);
    frame.add(new BasicArrowButton(BasicArrowButton.WEST), BorderLayout.WEST);
    frame.pack();
    frame.setVisible(true);

Answer 2

Using an ImageIcon on the button, or one of the Swing BasicArrowButtons is probably the best approach. However, you could also use Unicode arrow symbols. For example

\◄ : ◄

\← : ←

\► : ►

\→ : →

Some resources:

• http://en.wikipedia.org/wiki/Arrow_%28symbol%29
• http://www.alanwood.net/unicode/arrows.html
• Unicode symbols (arrows) in Java

You would need to ensure that the font(s) your application may use supports these symbols.

Answer 3

Just use a image:

ImageIcon icon = new ImageIcon("images/icon.gif");
JButton button2 = new JButton(icon);