Java File Extension Name Get getFileExtension(File f)

Description

Returns file's extension.

License

Apache License

Parameter

Parameter	Description
f	File in question.

Return

File extension including the dot or an empty string.

Declaration

public static String getFileExtension(File f) 

Method Source Code

//package com.java2s;
/**//from w  w w .  ja v  a  2  s  . c om
 * Copyright 2005 Cordys R&D B.V. 
 * 
 * This file is part of the Cordys File Connector. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File;

public class Main {
    /**
     * Returns file's extension.
     *
     * @param   f  File in question.
     *
     * @return  File extension including the dot or an empty string.
     */
    public static String getFileExtension(File f) {
        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) : "";
    }
}

Related

1. getFileExtension(File f)
2. getFileExtension(File f)
3. getFileExtension(File f)
4. getFileExtension(File f)
5. getFileExtension(File f)
6. getFileExtension(File f)
7. getFileExtension(File f)
8. getFileExtension(File file)
9. getFileExtension(File file)