如何在Java GUI中设置按钮的背景颜色？

Question

Below is the code which creates 9 buttons in gridlayout form on a specific pannel3. What i want is to make the background of each button black with grey text over it. Can anyone help please?

 for(int i=1;i<=9;i++)
 {
     p3.add(new JButton(""+i));
 }

Answer 1

Check out JButton documentation. Take special attention to setBackground and setForeground methods inherited from JComponent .

Something like:

for(int i=1;i<=9;i++)
{
    JButton btn = new JButton(String.valueOf(i));
    btn.setBackground(Color.BLACK);
    btn.setForeground(Color.GRAY);
    p3.add(btn);
}

Answer 2

Simple:

btn.setBackground(Color.red);

To use RGB values:

btn[i].setBackground(Color.RGBtoHSB(int, int, int, float[]));

Answer 3

for(int i=1;i<=9;i++) {
    p3.add(new JButton(""+i) {{
        // initialize the JButton directly
        setBackground(Color.BLACK);
        setForeground(Color.GRAY);
    }});
}

Answer 4

Changing the background property might not be enough as the component won't look like a button anymore. You might need to re-implement the paint method as in here to get a better result:

Answer 5

您可能需要也可能不必使用setOpaque方法来确保通过将true传递给方法来显示颜色。

Answer 6

Use the setBackground method to set the background and setForeground to change the colour of your text. Note however, that putting grey text over a black background might make your text a bit tough to read.

Answer 7

It seems that the setBackground() method doesn't work well on some platforms (I'm using Windows 7). I found this answer to this question helpful. However, I didn't entirely use it to solve my problem. Instead, I decided it'd be much easier and almost as aesthetic to color a panel next to the button.