sg.setColor(Color.YELLOW);
sg.draw(new Rectangle2D.Double(20, 20, 30, 50));
sg.setColor(Color.BLACK);
sg.drawLine(99, 3, 78, 3);
sg.drawRect(90, 20, 30, 50);
sg.setColor(Color.CYAN);
sg.setStroke(new BasicStroke(1, 2, BasicStroke.JOIN_ROUND, 4, null, 0));