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 */
32package build.tools.classlist;
33
34import java.net.InetAddress;
35import java.time.LocalDateTime;
36import java.time.ZoneId;
37import java.time.format.DateTimeFormatter;
38import java.util.stream.Stream;
39import java.util.logging.*;
40import java.util.Arrays;
41import java.util.Date;
42import java.util.List;
43import java.util.Locale;
44import java.text.DateFormat;
45
46import 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 */
53public 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}
80