Quelle CreateNewFile.java Sprache: JAVA

/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/* @test
   @bug 4130498 4391178 6198547
   @summary Basic test for createNewFile method
*/

import java.io.*;

public class CreateNewFile {

    public static void main(String[] args) throws Exception {

        File f = new File(System.getProperty("test.dir", "."),
                          "x.CreateNewFile");
        if (f.exists() && !f.delete())
            throw new Exception("Cannot delete test file " + f);
        if (!f.createNewFile())
            throw new Exception("Cannot create new file " + f);
        if (!f.exists())
            throw new Exception("Did not create new file " + f);
        if (f.createNewFile())
            throw new Exception("Created existing file " + f);

        try {
            f = new File("/");
            if (f.createNewFile())
                throw new Exception("Created root directory!");
        } catch (IOException e) {
            // Exception expected
        }

        testCreateExistingDir();
    }

    // Test JDK-6198547
    private static void testCreateExistingDir() throws IOException {
        File tmpFile = new File("hugo");
        if (tmpFile.exists() && !tmpFile.delete())
            throw new RuntimeException("Cannot delete " + tmpFile);
        if (!tmpFile.mkdir())
            throw new RuntimeException("Cannot create dir " + tmpFile);
        if (!tmpFile.exists())
            throw new RuntimeException("Cannot see created dir " + tmpFile);
        if (tmpFile.createNewFile())
            throw new RuntimeException("Should fail to create file " + tmpFile);
    }
}

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