用JAVA写的画图小程序，功能简单实用，是我们课程作业的题目，鼠标操作-Drawing with a small program written in JAVA, features a simple and practical, is the subject of our course work

用java语言编写的与windows下画图功能相似的简单程序，java课的作业- the simple process of java language similar to Windows painter functions