Java Utililty Methods File Extension Name Extract

List of utility methods to do File Extension Name Extract

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Description

The list of methods to do File Extension Name Extract are organized into topic(s).

Method

StringextractFileExtension(String path)
Extract the file extension from the given URI path. 
int end = path.indexOf('?');
if (end == -1) {
    end = path.indexOf('#');
    if (end == -1) {
        end = path.length();
int begin = path.lastIndexOf('/', end) + 1;
...
StringextractFileExtensionFromPath(String path)
Extracts file's extension in ".extension" format. 
if (path != null) {
    if (path.isEmpty()) {
        throw new IllegalArgumentException("File path can't be empty");
} else {
    throw new NullPointerException("File path can't be null");
String lowercaseName = path.toLowerCase();
...
StringgetFileExtension(File f)
get File Extension 
String fileName = f.getName();
String fileExtension = fileName;
int lastPos = fileName.lastIndexOf('.');
if (lastPos > 0 && lastPos < (fileName.length() - 1)) {
    fileExtension = fileName.substring(lastPos + 1).toLowerCase();
return fileExtension;
StringgetFileExtension(File file)
get File Extension 
String filename = file.getName().trim().toLowerCase();
if (filename.length() == 0)
    return "";
if (filename.charAt(filename.length() - 1) == '.')
    filename = filename.substring(0, filename.length() - 1);
int lastPointIndex = filename.lastIndexOf('.');
if (lastPointIndex < 0)
    return "";
...
StringgetFileExtension(File file)
get File Extension 
String path = file.getPath();
Matcher matcher = FileNamePattern.matcher(path);
if (matcher.find()) {
    return matcher.group(2);
return null;
StringgetFileExtension(File file)
get File Extension 
return getFileExtension(file.getPath());
StringgetFileExtension(File file)
get File Extension 
if (file == null) {
    return null;
return getFileExtension(file.getName());
StringgetFileExtension(File file)
get File Extension 
String name = file.getName();
int idx = name.lastIndexOf('.');
if (!file.isDirectory() && idx != -1) {
    return name.substring(idx + 1, name.length()).toLowerCase();
return "";
StringgetFileExtension(File file)
returns a file's extension/type, excluding the extension separator (by default a period '.') 
return getFileExtension(file.getName());
StringgetFileExtension(File file)
get File Extension 
if (file != null && file.exists()) {
    return getFileExtension(file.getAbsolutePath());
} else if (file == null)
    throw new NullPointerException("File is null");
else
    throw new FileNotFoundException("File [" + file.getAbsolutePath() + "] does not seem to exist.");