Java tutorial
import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; public class Main { public static void main(String args[]) { JFrame frame = new JFrame("Fourth Button"); Container contentPane = frame.getContentPane(); JButton b = new JButton("Button!"); Border bored = BorderFactory.createLineBorder(Color.RED); b.setBorder(bored); contentPane.add(b, BorderLayout.CENTER); frame.setSize(350, 200); frame.show(); } }