1 /*

     2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 /**

    27  * This application is meant to be run to create a classlist file representing

    28  * common use.

    29  *

    30  * The classlist is produced by adding -XX:DumpLoadedClassList=classlist

    31  */

    32 package build.tools.classlist;

    33 

    34 import java.net.InetAddress;

    35 import java.time.LocalDateTime;

    36 import java.time.ZoneId;

    37 import java.time.format.DateTimeFormatter;

    38 import java.util.stream.Stream;

    39 import java.util.logging.*;

    40 import java.util.Arrays;

    41 import java.util.Date;

    42 import java.util.List;

    43 import java.util.Locale;

    44 import java.text.DateFormat;

    45 

    46 import static java.util.stream.Collectors.*;

    47 

    48 /**

    49  * This class is used to generate a classlist during build. Intent

    50  * is to touch a reasonable amount of JDK classes that are commonly

    51  * loaded and used early.

    52  */

    53 public class HelloClasslist {

    54 

    55     private static final Logger LOGGER = Logger.getLogger("Hello");

    56 

    57     public static void main(String ... args) {

    58 

    59         List<String> strings = Arrays.asList("Hello", "World!", "From: ",

    60               InetAddress.getLoopbackAddress().toString());

    61 

    62         String helloWorld = strings.parallelStream()

    63               .map(s -> s.toLowerCase(Locale.ROOT))

    64               .collect(joining(","));

    65 

    66         Stream.of(helloWorld.split(","))

    67               .forEach(System.out::println);

    68 

    69         String newDate = DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(

    70                 LocalDateTime.now(ZoneId.of("GMT")));

    71 

    72         String oldDate = String.format("%s%n",

    73                 DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.ROOT)

    74                         .format(new Date()));

    75 

    76         LOGGER.log(Level.INFO, "New Date: " + newDate + " - old: " + oldDate);

    77     }

    78 

    79 }