Autocomplete using Emacs 24 does not apply to Java, C, or C mode

I used marmalade buy back to install autocomplete Everything was installed correctly, and after moving something, I managed to start and run AutoCorrect without any errors with my init The following code in El:

;; auto-complete
(add-to-list 'load-path "~/.emacs.d/elpa/auto-complete")
(require 'auto-complete-config)
(add-to-list 'ac-dictionary-directories "~/.emacs.d/elpa/auto-complete/dict")
(ac-config-default)

Now I can use autocomplete instead of Emacs lisp, but whenever I use any other mode, such as Java, C or C, it doesn't work at all

I also installed yasnippet (it works well), and I'm not sure if it has anything to do with it This is my init Relevant codes in El:

;;yasnippet
(add-to-list 'load-path
              "~/.emacs.d/plugins/yasnippet")
(require 'yasnippet)
(yas-global-mode 1)

I'm learning Emacs. At present, I'm still a rookie I've been looking at the documents and so, but I can't find anything I really appreciate any help

Solution

You may need to add a completion source This is the content of my configuration:

(set-default 'ac-sources
             '(ac-source-abbrev
               ac-source-dictionary
               ac-source-yasnippet
               ac-source-words-in-buffer
               ac-source-words-in-same-mode-buffers
               ac-source-semantic))

Update: AC config default should contain this content, but if autocomplete does not activate these modes, please try in init Add the following to El:

(dolist (m '(c-mode c++-mode java-mode))
  (add-to-list 'ac-modes m))

(global-auto-complete-mode t)

Update2: I released a gist that makes your init El can use package install to extract autocomplete functions

I don't know what version of autocomplete you quoted, but the latest version is good for me