Setting background color to JButton [duplicate]

Question

This question already has an answer here:

• Java Swing button colors [duplicate] 1 answer

I have a question about setting the background color to JButton.

It seems that the this method only changes the color of the border. Here is the difference (left is jButton):

Is there a way to make the background the same?

I'm using setLookAndFeel on Windows 8.

Answer 1

This will work with either the Metal (default) or Windows PLAFs.

import java.awt.*;
import javax.swing.*;

class ColoredButton {

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(
                            UIManager.getSystemLookAndFeelClassName());
                } catch (Exception e) {
                    e.printStackTrace();
                }

                JButton b1 = new JButton("Button 1");
                b1.setBackground(Color.RED);
                // these next two lines do the magic..
                b1.setContentAreaFilled(false);
                b1.setOpaque(true);

                JOptionPane.showMessageDialog(null, b1);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

Answer 2

Use .setOpaque(true) on the button.