用Java实现画图板功能的程序,请问如何编写一个绘制三角形的程序段_百...答:class Triangle extends drawings//空心三角形类 { void draw(Graphics2D g2d){g2d.setPaint(new Color(R,G,B));g2d.setStroke(new BasicStroke(stroke,BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));g2d.drawLine((int)((x1+x2)/2),Math.min(y1,y2),Math.max(x1,x2),Math.max(y1...