Whether the contents of the Document class monitoring the contents of the JTEXTAREA components are changed, the writing of simple notepads is basically completed, and some simple text reads and saves. It is familiar with NetBeans applications. Now it feels NetBeans for unrelated code segments. It still provides a considerable way to "change", but I haven't found it for the Import Manager I said to the Heart 5 brother, or have a handwritten introduction, laugh. Heart5 brothers If you see trouble, please let me know. Since I have been engaged in programming, I learned that Java feels similar to other languages, but I have a little confidence in myself, and I find that I need to do a deep understanding of knowledge. In the future, some boring basic knowledge may be conducted in the future. I have been doing UNIX C. I have some understanding of Delphi and C #, but it is limited to understanding. For visualization programming, there is also a place that is not understanding, I hope everyone will exchange. For Zorro.x brothers, I think everyone can learn together and make progress together. No matter what you use, you can master a language is not a bad place. :)