例12.07  多文档界面的文本文件编辑器
...................................\.classpath
...................................\.project
...................................\bin
...................................\...\FileExtensionFilter.class
...................................\...\MDITextFileEditorJFrame$TextJIFrame.class
...................................\...\MDITextFileEditorJFrame.class
...................................\open.gif
...................................\save.gif
...................................\src
...................................\...\FileExtensionFilter.java
...................................\...\MDITextFileEditorJFrame.java
...................................\唐诗
...................................\....\xcvc.txt
...................................\....\xcvccxvx.txt
...................................\....\凉州词.txt
...................................\....\回乡偶书.txt
...................................\....\塞下曲.txt
...................................\....\备份
...................................\....\....\游子吟.txt
...................................\....\忆江南.txt
...................................\....\游子吟.txt
...................................\....\赋得古原草送别.txt