The decimal point (.) cannot be used in Java To act as a delimiter

split () is a string parameter in parentheses, so be sure to conform to this: Split (".") form, that is, the point '. ' Enclose them in double quotation marks ""
"." is already defined as a special character in Java, so you want to use "." In Split (). It must be escaped in order to avoid ambiguity, i.e. in the use of "." "\ \" is required for string segmentation.
such as: String myString = "Myblog.cnblogs";
Mystring.split ("\ \");
Get the final result: MyBlog and Cnblogs

The decimal point (.) cannot be used in Java To act as a delimiter