Java in the split-point to split the problem

[LeetCode] -165. Compare Version Numbers this problem, split on a String ( ".") Can not cut problem points.

Development today using the string split function split (), we found that:

String s = "upload/20120416135915265.sql";

        System.out.println(s.split("."));

Output is not the desired result, after the output:

System.out.println(s.split(".").length);

The results turned out to be 0! ! ! 

Suddenly thought of the escape character, then:

    System.out.println(s.split("\\."));

OK! ! ! 

In java original function split ( ".") Must be Yes split ( "\\.").