Java Swing Icon create arrow icon

import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Graphics;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingConstants;

public class Main extends JFrame {
  public Main() {
    super("JButton");

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new FlowLayout());

    ArrowIcon icon = new ArrowIcon(SwingConstants.LEADING);
    /*from  ww  w . j a v  a  2 s.c  om*/
    JButton bn = new JButton("Close", icon);

    getContentPane().add(bn);
  }

  public static void main(String[] args) {
    Main frame = new Main();
    frame.pack();
    frame.setVisible(true);
  }
}

class ArrowIcon implements Icon, SwingConstants {
  private int width = 9;
  private int height = 18;

  private int[] xPoints = new int[4];
  private int[] yPoints = new int[4];

  public ArrowIcon(int direction) {
    if (direction == LEADING) {
      xPoints[0] = width;
      yPoints[0] = -1;
      xPoints[1] = width;
      yPoints[1] = height;
      xPoints[2] = 0;
      yPoints[2] = height / 2;
      xPoints[3] = 0;
      yPoints[3] = height / 2 - 1;
    } else /* direction == TRAILING */ {
      xPoints[0] = 0;
      yPoints[0] = -1;
      xPoints[1] = 0;
      yPoints[1] = height;
      xPoints[2] = width;
      yPoints[2] = height / 2;
      xPoints[3] = width;
      yPoints[3] = height / 2 - 1;
    }
  }

  public int getIconHeight() {
    return height;
  }

  public int getIconWidth() {
    return width;
  }

  public void paintIcon(Component c, Graphics g, int x, int y) {
    if (c.isEnabled()) {
      g.setColor(c.getForeground());
    } else {
      g.setColor(Color.gray);
    }

    g.translate(x, y);
    g.fillPolygon(xPoints, yPoints, xPoints.length);
    g.translate(-x, -y); // Restore graphics object
  }
}