Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import java.io.File;

public class Main {
    public static String getFileExtension(File file) {
        return getFileExtension(file.getPath());
    }

    public static String getFileExtension(String path) {
        // 'archive.tar.gz' -> 'gz'
        // '/path/to.a/file' -> ''
        // '/root/case/g.txt' -> 'txt'
        // '/root/case/g.txt.gg' -> 'gg'
        // '/root/case/g.txt.gg/' -> ''
        // '.htaccess' -> 'htaccess'
        // '/.htaccess' -> 'htaccess'
        // '/s/.htaccess' -> 'htaccess'

        String extension = null;

        int i = path.lastIndexOf('.');
        int p = Math.max(path.lastIndexOf('/'), path.lastIndexOf('\\'));

        if (i > p) {
            extension = path.substring(i + 1);
        }
        return extension;
    }
}