Java tutorial
import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.Container; import java.awt.Graphics; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JFrame; public class Main { public static void main(String args[]) { JFrame frame = new JFrame(""); Container contentPane = frame.getContentPane(); Icon icon = new PieIcon(Color.red); JButton b = new JButton("Button!", icon); contentPane.add(b, BorderLayout.NORTH); b = new JButton(icon); contentPane.add(b, BorderLayout.SOUTH); frame.setSize(300, 200); frame.show(); } } class PieIcon implements Icon { Color color; public PieIcon(Color c) { color = c; } public int getIconWidth() { return 20; } public int getIconHeight() { return 20; } public void paintIcon(Component c, Graphics g, int x, int y) { g.setColor(color); g.fillArc(x, y, getIconWidth(), getIconHeight(), 45, 270); } }