English word frequency algorithm in Java

The English word frequency algorithm implemented by Java is usually implemented by using a tree of words. Using Java to achieve word frequency statistics,
In order to count the frequency of words, the simplest way is to create a map, where key is the word, value
The number of delegates.  Read the article from the beginning to the end, read a word on the map to check, if found the time
Number plus one, not found then put in map. This makes the code simple, but does not achieve the desired effect by
The performance test shows that performance is very poor. In terms of time complexity, the map time complexity is 0 (LOGN),
If the high-frequency words need to be sorted, even in the structure optimization, but the final still can not be greatly improved performance.

English word frequency algorithm in Java