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Apache Commons VFS is a Virtual File System library - Examples.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.commons.vfs2.example;

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.VFS;

/**
 * Example to change the last modification time of the given file.
 */
public final class ChangeLastModificationTime {
    private ChangeLastModificationTime() {
        /* main class not instantiated. */
    }

    public static void main(final String[] args) throws Exception {
        if (args.length == 0) {
            System.err.println("Please pass the name of a file as parameter.");
            return;
        }

        final FileObject fo = VFS.getManager().resolveFile(args[0]);
        final long setTo = System.currentTimeMillis();
        System.err.println("set to: " + setTo);
        fo.getContent().setLastModifiedTime(setTo);
        System.err.println("after set: " + fo.getContent().getLastModifiedTime());
    }

}