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

StringfileExtension(String filename)
file Extension 
String extension = "";
int i = filename.lastIndexOf('.');
int p = Math.max(filename.lastIndexOf('/'), filename.lastIndexOf('\\'));
if (i > p) {
    extension = filename.substring(i + 1);
return extension;
StringfileExtension(String path)
file Extension 
int token = path.lastIndexOf(".");
String ext = path.substring(token + 1, path.length()).toLowerCase();
return ext;
StringgetFileExtension(File _file)
Extracts the file extension (part behind last dot of a filename). 
return getFileExtension(_file.getAbsolutePath());
StringgetFileExtension(File f)
get File Extension 
String[] split = f.getName().split("\\.");
if (split.length > 1) {
    return split[1];
} else {
    return null;
StringgetFileExtension(File f)
Get the file extension (if present). 
return getFileExtension(f.getName());
StringgetFileExtension(File f)
get File Extension 
return getFileExtension(f.getAbsolutePath());
StringgetFileExtension(File f)
Returns file's extension. 
String name = (f != null) ? f.getName() : null;
if ((name == null) || (name.length() == 0)) {
    return "";
int pos = name.lastIndexOf('.');
return ((pos > 0) && (pos < (name.length() - 1))) ? name.substring(pos) : "";
StringgetFileExtension(File f)
Return the file extension (the last part of the name after the last '.'). 
if (f == null)
    return null;
String fn = f.getName();
if (fn.length() <= 0 || fn.startsWith(".")) 
    return fn;
int p = fn.lastIndexOf('.');
if (p < 0)
    return "";
...
StringgetFileExtension(File f)
Gets the file extension. 
String result;
if (f.isDirectory())
    result = null;
else {
    int index = f.getName().lastIndexOf('.');
    result = index < 0 || index + 1 == f.getName().length() ? "" : f.getName().substring(index + 1); 
return result;
...
StringgetFileExtension(File f)
Utility function to return the lower-cased file extension - the part of the filename after the last period. 
String ext = null;
String s = f.getName();
int i = s.lastIndexOf('.');
if (i > 0 && i < s.length() - 1) {
    ext = s.substring(i + 1).toLowerCase();
return ext;