Java Is File Newer isNewer(File file1, File file2)

Description

This will check to see if file1 is newer than file2.

License

Open Source License

Parameter

Parameter	Description
file1	a parameter
file2	a parameter

Return

indication if file1 is newer than file2

Declaration

public static Boolean isNewer(File file1, File file2) 

Method Source Code

//package com.java2s;
/*/*from  w  ww.  j av  a 2  s  .  co m*/
 * RHQ Management Platform
 * Copyright (C) 2005-2008 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation, and/or the GNU Lesser
 * General Public License, version 2.1, also as published by the Free
 * Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License and the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * and the GNU Lesser General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

import java.io.File;

public class Main {
    /**
     * This will check to see if file1 is newer than file2. If file1's last modified date
     * is <strong>after</strong> file2's last modified date, then <code>true</code> is returned.
     * <code>false</code> is returned if file1's date is the same or older than file2's date.
     * <p>
     * <code>null</code> is returned if any of these conditions are true:
     * <ul>
     * <li>If either file is null</li>
     * <li>If either file does not exist</li>
     * <li>If either file is not a normal file (but, say, a directory)</li>
     * </ul>
     * </p>
     *
     * @param file1
     * @param file2
     * @return indication if file1 is newer than file2
     */
    public static Boolean isNewer(File file1, File file2) {
        if (file1 == null || file2 == null) {
            return null;
        }
        if (!file1.isFile() || !file2.isFile()) {
            return null;
        }
        long file1Date = file1.lastModified();
        long file2Date = file2.lastModified();
        return file1Date > file2Date;
    }
}

Related

1. isNewer(File file, File reference)
2. isNewer(String file, String reference)
3. isNewerOrEqual(String newFile, String oldFile)