How to get a file extension

I wonder how to get the portion of text after the last dot in a string.
For example to get .java from my.project.java or .jpg from my-photo.jpg
String[] parts = "test.test.test".split(".");
if(parts.length == 0) return false;
return true;For some reason it returns false!

String#split takes a regex.String[] parts = "test.test.test".split("\\.");But I think you would be better off trying to use lastIndexOf and substring.
db

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