Java File Extension Name Get getFileExtension(File file)

Description

get File Extension

License

Apache License

Parameter

Parameter	Description
file	a parameter

Return

the extension of a file represented by a File object, returns the separator char (/ or \) in case of a directory

Declaration

static public String getFileExtension(File file) 

Method Source Code

//package com.java2s;
/**// w ww  .ja  v  a 2s .co m
 * Sapelli data collection platform: http://sapelli.org
 * 
 * Copyright 2012-2016 University College London - ExCiteS group
 * 
 * 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 {
    /**
     * @param file
     * @return the extension of a file represented by a File object, returns the separator char (/ or \) in case of a directory
     */
    static public String getFileExtension(File file) {
        if (file.isFile())
            return getFileExtension(file.getName());
        else
            return "" + File.separatorChar;
    }

    /**
     * Returns the extension of the filePath. e.g. for "/my/path/myfile.raw" : "raw"
     * 
     * @param filePath
     * @return The extension of the filePath. If there is no extension the empty String is returned.
     */
    static public String getFileExtension(String filePath) {
        int lastIndex = filePath.lastIndexOf(".");
        if (lastIndex == -1)
            return "";
        return filePath.substring(lastIndex + 1, filePath.length());
    }
}

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1. getFileExtension(File file)
2. getFileExtension(File file)
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7. getFileExtension(File file)
8. getFileExtension(File file)
9. getFileExtension(File file)