Java tutorial
//package com.java2s; public class Main { /** * Read a file and return as a String * * @param path the filepath to append the extension to * @param extension the extension to be appended * @return the string representing the filename with extension * @since 0.11.0 */ public static String addExtension(String path, String extension) { if (path == null || path.isEmpty()) { return ""; } if (extension == null || extension.isEmpty()) { return path; } return path + "." + extension; } }