How to set a background color of a JButton in Java?

Question

I am developing a Java Desktop Application. In it I have 4 JButtons on a JPanel. Now I want that whenever a button is clicked its background color

Answer 1

If you wish you can redesign your whole button UI

public class buttonUI extends javax.swing.plaf.basic.BasicButtonUI{

buttonUI(JButton b){
    b.setContentAreaFilled(false);
}

@Override
    public void paint(Graphics g,JComponent c){
             Graphics2D g2d = (Graphics2D) g;
             g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
             AbstractButton b = (AbstractButton) c;
             g2d.setFont(font.deriveFont(11f));
             Dimension d = b.getSize();
             FontMetrics fm = g2d.getFontMetrics();
             g2d.setColor(new Color(100,100,100));
             String caption = b.getText();
             int x = (d.width - fm.stringWidth(caption)) / 2;
             int y = (d.height + fm.getAscent()) / 2 - 2;
             g2d.drawString(caption, x, y);        
        }   }

and in your main piece of code use like

jButton1.setUI(new buttonUI(jButton1));

This how I use it .. you can have your own way too