| /* Number.java =- abstract superclass of numeric objects |
| Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.lang; |
| |
| import java.io.Serializable; |
| |
| /** |
| * Number is a generic superclass of all the numeric classes, including |
| * the wrapper classes {@link Byte}, {@link Short}, {@link Integer}, |
| * {@link Long}, {@link Float}, and {@link Double}. Also worth mentioning |
| * are the classes in {@link java.math}. |
| * |
| * It provides ways to convert numeric objects to any primitive. |
| * |
| * @author Paul Fisher |
| * @author John Keiser |
| * @author Warren Levy |
| * @author Eric Blake (ebb9@email.byu.edu) |
| * @since 1.0 |
| * @status updated to 1.4 |
| */ |
| public abstract class Number implements Serializable |
| { |
| /** |
| * Compatible with JDK 1.1+. |
| */ |
| private static final long serialVersionUID = -8742448824652078965L; |
| |
| /** |
| * Table for calculating digits, used in Character, Long, and Integer. |
| */ |
| static final char[] digits = { |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
| 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', |
| 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', |
| 'u', 'v', 'w', 'x', 'y', 'z', |
| }; |
| |
| /** |
| * The basic constructor (often called implicitly). |
| */ |
| public Number() |
| { |
| } |
| |
| /** |
| * Return the value of this <code>Number</code> as an <code>int</code>. |
| * |
| * @return the int value |
| */ |
| public abstract int intValue(); |
| |
| /** |
| * Return the value of this <code>Number</code> as a <code>long</code>. |
| * |
| * @return the long value |
| */ |
| public abstract long longValue(); |
| |
| /** |
| * Return the value of this <code>Number</code> as a <code>float</code>. |
| * |
| * @return the float value |
| */ |
| public abstract float floatValue(); |
| |
| /** |
| * Return the value of this <code>Number</code> as a <code>float</code>. |
| * |
| * @return the double value |
| */ |
| public abstract double doubleValue(); |
| |
| /** |
| * Return the value of this <code>Number</code> as a <code>byte</code>. |
| * |
| * @return the byte value |
| * @since 1.1 |
| */ |
| public byte byteValue() |
| { |
| return (byte) intValue(); |
| } |
| |
| /** |
| * Return the value of this <code>Number</code> as a <code>short</code>. |
| * |
| * @return the short value |
| * @since 1.1 |
| */ |
| public short shortValue() |
| { |
| return (short) intValue(); |
| } |
| } |