J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 name="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 JDK1.0 |
| 70 | */ |
| 71 | package java.lang; |