查询代码网站

<search terms>  Search for <search terms> within files.

sort -  md5 -  "smtp server" 
cdef:<search term>  Search for classes whose name contains <search term>

cdef:tree - cdef:account -  cdef:parser 
mdef:<search term>  Search for methods whose name contains <search term>

mdef:compute  -  mdef:insert  -  mdef:getUserId 
idef:<search term>  Search for interfaces whose name contains <search term>

idef:tree -    idef:logging  -  idef:configuration 
file:<search term>  Search for files with names that match the <search term>

file:semaphore.cs  -   file:semap*.java 
compound examples  Search for classes named 'tree' with a method named 'insert'

"cdef:tree    mdef:insert"
以上是查询方法：
http://www.koders.com
还有一个www.java2s.com