au BufRead *.py map <buffer> <F9> :w<CR>:!/usr/bin/env python2 % <CR>
au BufRead *.c map <buffer> <F10> :w<CR>:!gcc % &&./a.out <CR>
"au BufRead *.java map <buffer> <F7> :w<CR>:!javac % <CR>
"au BufRead *.java map <buffer> <F8> :w<CR>:!java %:r <CR>
map <F7> :w<CR>:!javac % <CR>
map <F8> :w<CR>:!java %:r <CR>