Java File Extension Name Extract extractFileExtension(String filename)

Description

extract File Extension

License

Apache License

Parameter

Parameter	Description
filename	Filename from which to extract the extension

Return

The extension Everything after the last "." in the full filename

Declaration

public static String extractFileExtension(String filename) 

Method Source Code

//package com.java2s;
/*//from ww  w  .j  a  v  a2  s .  com
 * Copyright 2011-2015 Kay Stenschke
 *
 * 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.
 */

public class Main {
    /**
     * @param   filename      Filename from which to extract the extension
     * @return   The extension   Everything after the last "." in the full filename
     */
    public static String extractFileExtension(String filename) {
        if (filename.isEmpty())
            return null;

        if (filename.contains("/"))
            filename = filename.substring(filename.lastIndexOf("/") + 1);

        if (filename.length() < 3 || !filename.contains(".")) {
            return null;
        }

        return filename.substring(filename.lastIndexOf('.') + 1);
    }
}

Related

1. ExtractFileExtension(String file_name)
2. extractFileExtension(String filename)
3. extractFileExtension(String fileName)
4. extractFileExtension(String filename)
5. extractFileExtension(String fileName)
6. extractFileExtension(String filename)
7. extractFileExtension(String filePath)
8. extractFileExtension(String path)
9. extractFileExtensionFromPath(String path)