1. yum install emacs
   

2. vi ~/.emacs.d/init.el

   (if ( file-exists-p "~/.emacs.d/.emacs") (load "~/.emacs.d/.emacs"))

3. vi ~/.emacs.d/.emacs

   (add-to-list ‘load-path "~/.emacs.d/jdee-2.4.1/lisp")

   (load "jde")

4. cedet

   http://sourceforge.net/projects/cedet/?source=dlp

   ecb

   https://github.com/alexott/ecb/downloads

   git clone https://github.com/emacsmirror/ecb.git

   http://ecb.sourceforge.net/ 这里下载的不兼容，
   

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jdee环境安装