java编写的一个java画图程序；工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除；可以调整画笔、橡皮大小；显示画色板，调整画笔颜色；-java write a java drawing program Tools panel- brushes, straight line, circle, rectangle, polygon, eraser, clear can adjust the brush, eraser size display painting swatches to adjust pen color can open an existing image, but also the drawing can be saved.