Dotted border on one side for JPanel

Is there a way to add a dotted border on only one side to a component Java Swing

like JPanel

or JLabel


The question does not duplicate the other question because this question is about a line border for one side. But I need a dotted border.


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2 answers

The question does not duplicate the other question because this question is about line border for one side

Yes, this is a duplicate, because the API shows you how to use MatteBorder

with Icon

one hand. So, all you have to do is create a Dotted Line Icon. See the example posted in my code below.

Or the second option, not listed in the wiring, is to use CompoundBorder

to create the desired effect:

Border empty = BorderFactory.createEmptyBorder(0, -1, -1, -1);
Border dashed = BorderFactory.createDashedBorder(null, 5, 5);
Border compound = new CompoundBorder(empty, dashed);


By setting the size EmptyBorder

to -1, you set the merged size to 0, so it DashedBorder

will only paint on one side.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class DashedBorder extends JPanel
    public DashedBorder()
        //  Use an Icon in the MatteBorder

        JLabel label1 = new JLabel("Label Using a Matte Border");

        Icon icon = new DashedLineIcon(Color.BLACK, 5, 1, 5, 0);
        Border matte = BorderFactory.createMatteBorder(1, 0, 0, 0, icon);
        label1.setBorder( matte );

        //  Create a CompoundBorder using the DashedBorder

        JLabel label2 = new JLabel("Label Using a Dashed Border");

        Border dashed = BorderFactory.createDashedBorder(null, 5, 5);
        Border empty = BorderFactory.createEmptyBorder(1, -1, -1, -1);
        Border compound = new CompoundBorder(empty, dashed);
        label2.setBorder( compound );


    static public class DashedLineIcon implements Icon
        private Color color;
        private int dashWidth;
        private int dashHeight;
        private int emptyWidth;
        private int emptyHeight;

        public DashedLineIcon(Color color, int dashWidth, int dashHeight, int emptyWidth, int emptyHeight )
            this.color = color;
            this.dashWidth = dashWidth;
            this.dashHeight = dashHeight;
            this.emptyWidth = emptyWidth;
            this.emptyHeight = emptyHeight;

        public int getIconWidth()
            return dashWidth + emptyWidth;

        public int getIconHeight()
            return dashHeight + emptyHeight;

        public void paintIcon(Component c, Graphics g, int x, int y)
            g.fillRect(x, y, dashWidth, dashHeight);

    private static void createAndShowGUI()
        JFrame frame = new JFrame("Dashed Border");
        frame.add(new DashedBorder());
        frame.setLocationByPlatform( true );
        frame.setVisible( true );

    public static void main(String[] args)
        EventQueue.invokeLater(new Runnable()
            public void run()




And I ended up with this solution, although it's a little more complicated:

private void drawBorder(Graphics g){
  int x = this.getWidth();
  float dash[] = {1.0f};
  Graphics2D g2;
  BasicStroke stroke;

  g2 = (Graphics2D)g;
  stroke = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 1.0f, dash, 0.0f);
  g2.setColor((Color) new Color(120, 120, 120));

  g2.draw(new Line2D.Double(0, 0, x, 0));

panel = new JPanel(){
  public void paintComponent(Graphics g){


Here I have drawn the top line using methods Graphics2D

and using a class BasicStroke

to create dashes, which are actually dots, because the density array dash

tells it that it has a space 1

between dashes by dashes of lengths.



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