窗口上的文本行显示当前文件的路径，文本区用于编辑文件，3个按钮

[打开]，[保存…],[另存为…]。

单击[打开]按钮时，弹出打开文件对话框，将选择的文件显示在文本区中。

单击[保存…]按钮时，如果当前文件为空，则弹出保存文件对话框，并按设置的文件名保存文件；如果已有文件，则按设置的文件名保存文件。

单击[另存为…]按钮时，则弹出保存文件对话框，并按设置的文件名保存文件。

程序中以字符文件输出流FileWriter的writer方法写入文本区内容，以字符缓冲输入流BufferedReader的readLine()方法按行读取文本文件。

-window on the text line shows the path the current document, the text area for editing documents, three buttons [open] [preservation] [Save as ...]. Click [Open] button, pop open file dialog box, select the document in the text area. Click [preservation] button, if the current document is empty, save dialog pop up, together with a set of documents were preserved; If the document has been, according to the paper were set up to preserve documents. Click [Save as ...] button, the pop-up dialog box to preserve documents, together with a set of documents were preserved documents. Character procedures to document the output stream FileWriter way into the text writer District, characters in the input stream buffer BufferedReader the readLine () method by reading text line this document.