Java File Extension Name Get getFileExtension(File f)

Description

Return the file extension (the last part of the name after the last '.').

License

Open Source License

Parameter

Parameter	Description
f	The file

Return

The file extension

Declaration

public static String getFileExtension(File f) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2012 Firestar Software, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from w  ww.j a  v a 2  s. co m
 *     Firestar Software, Inc. - initial API and implementation
 *
 * Author:
 *     Gabriel Oancea
 *
 *******************************************************************************/

import java.io.*;

public class Main {
    /**
     * Return the file extension (the last part of the name after the last '.').
     * 
     * @param f The file
     * @return The file extension
     */
    public static String getFileExtension(File f) {
        if (f == null)
            return null;
        String fn = f.getName();
        if (fn.length() <= 0 || fn.startsWith(".")) // ., .., and any .xxx
            return fn;
        int p = fn.lastIndexOf('.');
        if (p < 0)
            return "";
        if (p == 0)
            return fn.substring(1);
        if (p == fn.length() - 1)
            return "";
        return fn.substring(p + 1);
    }
}

Related

1. getFileExtension(File _file)
2. getFileExtension(File f)
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7. getFileExtension(File f)
8. getFileExtension(File f)
9. getFileExtension(File f)