1/*
2 * Copyright (c) 1998, 2017, 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 * Provides classes that are fundamental to the design of the Java
28 * programming language. The most important classes are {@code
29 * Object}, which is the root of the class hierarchy, and {@code
30 * Class}, instances of which represent classes at run time.
31 *
32 * <p>Frequently it is necessary to represent a value of primitive
33 * type as if it were an object. The wrapper classes {@code Boolean},
34 * {@code Character}, {@code Integer}, {@code Long}, {@code Float},
35 * and {@code Double} serve this purpose.  An object of type {@code
36 * Double}, for example, contains a field whose type is double,
37 * representing that value in such a way that a reference to it can be
38 * stored in a variable of reference type.  These classes also provide
39 * a number of methods for converting among primitive values, as well
40 * as supporting such standard methods as equals and hashCode.  The
41 * {@code Void} class is a non-instantiable class that holds a
42 * reference to a {@code Class} object representing the type void.
43 *
44 * <p>The class {@code Math} provides commonly used mathematical
45 * functions such as sine, cosine, and square root. The classes {@code
46 * String}, {@code StringBuffer}, and {@code StringBuilder} similarly
47 * provide commonly used operations on character strings.
48 *
49 * <p>Classes {@code ClassLoader}, {@code Process}, {@code
50 * ProcessBuilder}, {@code Runtime}, {@code SecurityManager}, and
51 * {@code System} provide "system operations" that manage the dynamic
52 * loading of classes, creation of external processes, host
53 * environment inquiries such as the time of day, and enforcement of
54 * security policies.
55 *
56 * <p>Class {@code Throwable} encompasses objects that may be thrown
57 * by the {@code throw} statement. Subclasses of {@code Throwable}
58 * represent errors and exceptions.
59 *
60 * <a id="charenc"></a>
61 * <h3>Character Encodings</h3>
62 *
63 * The specification of the {@link java.nio.charset.Charset
64 * java.nio.charset.Charset} class describes the naming conventions
65 * for character encodings as well as the set of standard encodings
66 * that must be supported by every implementation of the Java
67 * platform.
68 *
69 * @since 1.0
70 */
71package java.lang;
72