Java Utililty Methods File Extension Name Get

List of utility methods to do File Extension Name Get

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Description

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

Method

StringgetFileExtension(File file, boolean withDot)
Returns extension of specified file. 
if (file == null) {
    return null;
String path = file.getAbsolutePath();
int dotAt = path.lastIndexOf('.');
if (dotAt < 0) {
    return null;
if (!withDot) {
    dotAt++;
return path.substring(dotAt);
StringgetFileExtension(final File aFile)
Returns the "presumed" filename extension (like '.jpg', '.zip') from a given file. 
String ext = "";
String filename = aFile.getName();
int idx = filename.lastIndexOf('.');
if ((idx >= 0) && (idx < (filename.length() - 1))) {
    ext = filename.substring(idx + 1).toLowerCase();
if (aFile.exists() && aFile.isDirectory() && !"".equals(ext)) {
    ext = "";
...
StringgetFileExtension(final File file)
Gets the extension of a filename. 
if (file == null) {
    throw new IllegalArgumentException("Unable to get the file extension from 'null'");
final String fileName = file.getName();
final int lastIndexOfDot = fileName.lastIndexOf('.');
if (lastIndexOfDot > 0) {
    return fileName.substring(lastIndexOfDot + 1);
return "";
StringgetFileExtension(final File file)
get File Extension 
final String ext;
if (file != null) {
    final String scriptFileName = file.getName();
    ext = scriptFileName.lastIndexOf('.') == -1 ? ""
            : scriptFileName.substring(scriptFileName.lastIndexOf('.') + 1, scriptFileName.length());
} else {
    ext = "";
return ext;
StringgetFileExtension(final String file)
Returns the file extension of a file 
final int lastIndexOf = file.lastIndexOf('.');
if (lastIndexOf == -1) {
    return ""; 
return file.substring(lastIndexOf + 1);
StringgetFileExtension(final String fullName)
Returns the file extension for the given file name, or the empty string if the file has no extension. 
Assert.isNotNull(fullName, "fullName must be given!"); 
final String fileName = new File(fullName).getName();
final int dotIndex = fileName.lastIndexOf('.');
return (dotIndex == -1) ? "" : fileName.substring(dotIndex + 1);
StringgetFileExtension(String file)
get File Extension 
return getFileExtension(new File(file));
StringgetFileExtension(String filename)
get File Extension 
if (filename != null) {
    int n = filename.lastIndexOf('.');
    if (n >= 0) {
        return filename.substring(n + 1);
return null;
StringgetFileExtension(String fileName)
get File Extension 
int i = fileName.lastIndexOf('.');
int p = Math.max(fileName.lastIndexOf('/'), fileName.lastIndexOf('\\'));
if (i > p) {
    return fileName.substring(i + 1);
return "";
StringgetFileExtension(String filename)
exclude "." 
try {
    return filename.substring(filename.lastIndexOf(".") + 1);
} catch (Exception e) {
    return null;