求一个简单记事本的java程序代码，源代码要带解释，网上找的就不要在这里发了，能实现基本功能就够了。要能够在jcreator里运行成功无报错。能提供运行图片最好-Seeking a simple notepad java code, source code to take explain, do not find online here made, to achieve basic functionality is enough. In jcreator to be able to run su