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 ALineBorder {
public static void main(String args[]) {
JFrame frame = new JFrame("Line Borders");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Border thinBorder = LineBorder.createBlackLineBorder();
Border thickBorder = new LineBorder(Color.WHITE, 12);
Border roundedBorder = new LineBorder(Color.BLACK, 2, true);
JButton thinButton = new JButton("1 Pixel");
thinButton.setBorder(thinBorder);
JButton thickButton = new JButton("12 Pixel");
thickButton.setBorder(thickBorder);
JButton roundedButton = new JButton("Rounded 2 Pixel");
roundedButton.setBorder(roundedBorder);
Container contentPane = frame.getContentPane();
contentPane.add(thinButton, BorderLayout.NORTH);
contentPane.add(thickButton, BorderLayout.CENTER);
contentPane.add(roundedButton, BorderLayout.SOUTH);
frame.pack();
frame.setSize(300, frame.getHeight());
frame.setVisible(true);
}
}