Java tutorial
import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; import javax.swing.border.LineBorder; public class MainClass { public static void main(final String args[]) { JFrame frame = new JFrame("Line Borders"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Border roundedBorder = new LineBorder(Color.BLACK, 12, true); JButton roundedButton = new JButton("Rounded 12 Pixel"); roundedButton.setBorder(roundedBorder); Container contentPane = frame.getContentPane(); contentPane.add(roundedButton, BorderLayout.SOUTH); frame.pack(); frame.setSize(300, frame.getHeight()); frame.setVisible(true); } }