Create custom Bottom Border in Java

//w w  w. ja va 2  s. co m
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Insets;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.AbstractBorder;
public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Sample Borders");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JLabel aLabel = new JLabel("java2s.com");
    aLabel.setBorder(new BottomBorder(Color.RED));
    aLabel.setHorizontalAlignment(JLabel.CENTER);

    frame.add(aLabel);
    frame.setSize(400, 200);
    frame.setVisible(true);
  }
}

class BottomBorder extends AbstractBorder {
 protected int thickness;

 protected Color lineColor;

 protected int gap;

 public BottomBorder(Color color) {
   this(color, 1, 1);
 }

 public BottomBorder(Color color, int thickness) {
   this(color, thickness, thickness);
 }

 public BottomBorder(Color color, int thickness, int gap) {
   lineColor = color;
   this.thickness = thickness;
   this.gap = gap;
 }

 public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
   Color oldColor = g.getColor();
   int i;

   g.setColor(lineColor);
   for (i = 0; i < thickness; i++) {
     g.drawLine(x, y + height - i - 1, x + width, y + height - i - 1);
   }
   g.setColor(oldColor);
 }

 public Insets getBorderInsets(Component c) {
   return new Insets(0, 0, gap, 0);
 }

 public Insets getBorderInsets(Component c, Insets insets) {
   insets.left = 0;
   insets.top = 0;
   insets.right = 0;
   insets.bottom = gap;
   return insets;
 }

 /**
  * Returns the color of the border.
  */
 public Color getLineColor() {
   return lineColor;
 }

 /**
  * Returns the thickness of the border.
  */
 public int getThickness() {
   return thickness;
 }

 /**
  * Returns whether or not the border is opaque.
  */
 public boolean isBorderOpaque() {
   return false;
 }

 public int getGap() {
   return gap;
 }

}