Detecting the type of a file by its name

FileHelper.java

public static String getFileExtension(File file) {
	return FileHelper.getFileExtension(file.getName());
}

public static String getFileExtension(String name) {
	if (! name.contains(".")) {
		return "";
	}
	String[] split = name.split("\\.");
	String extension = split[split.length - 1];
	return extension;
}