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Dotted Line

Stroke drawingStroke = new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 15);
         Graphics g=getG();
         Graphics2D g2d = (Graphics2D) g;
         g2d.setStroke(drawingStroke);
         g.drawLine(40,40,120,200);