Java虚线与实线，利用JAVA绘制2D图形、设置绘制线条的颜色，可以绘制实线和曲线，一个JAVA图形绘图的实例程序-Java dotted line and solid line, the use of JAVA to draw 2D graphics, set the color to draw lines, draw a solid line and curve, an instance of a JAVA graphical drawing program