Java tutorial
//com.amkai.borders; import java.awt.Graphics; import java.awt.Insets; import java.awt.Color; import java.awt.Component; import javax.swing.border.AbstractBorder; public class RightSideBorder extends AbstractBorder { protected int thickness; protected Color lineColor; protected int gap; public RightSideBorder(Color color) { this(color, 1, 1); } public RightSideBorder(Color color, int thickness) { this(color, thickness, thickness); } public RightSideBorder(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 + width - i - 1, y, x + width - i - 1, y + height); } g.setColor(oldColor); } /** * Returns the insets of the border. * @param c the component for which this border insets value applies */ public Insets getBorderInsets(Component c) { return new Insets(0, 0, 0, gap); } public Insets getBorderInsets(Component c, Insets insets) { insets.left = 0; insets.top = 0; insets.right = gap; insets.bottom = 0; 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; } }