too long
String extension = filename.substring(filename.lastIndexOf(".")+1); 

Fails on some inputs
eg ".htaccess" or "noextension" Here's a fixed version: // default in case there's no extension: String baseName = fileName; String extension = ""; // split on position of dot in name int lastDotPos = fileName.lastIndexOf(".");  

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Java: Example - Display Extension This program reads in a file name... 26 // Purpose: Display the extension (with .) of a file name. // File...; // The file name the user entered. String extension; // The extension 

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Java: Example - Change Extension Problem: Change the extension of a file name //============================================== changeExtension // changes extension to new extension // example: x = changeExtension