1 /* Number.java =- abstract superclass of numeric objects 2 Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package java.lang; 40 41 import java.io.Serializable; 42 43 /** 44 * Number is a generic superclass of all the numeric classes, including 45 * the wrapper classes {@link Byte}, {@link Short}, {@link Integer}, 46 * {@link Long}, {@link Float}, and {@link Double}. Also worth mentioning 47 * are the classes in {@link java.math}. 48 * 49 * It provides ways to convert numeric objects to any primitive. 50 * 51 * @author Paul Fisher 52 * @author John Keiser 53 * @author Warren Levy 54 * @author Eric Blake (ebb9@email.byu.edu) 55 * @since 1.0 56 * @status updated to 1.4 57 */ 58 public abstract class Number implements Serializable 59 { 60 /** 61 * Compatible with JDK 1.1+. 62 */ 63 private static final long serialVersionUID = -8742448824652078965L; 64 65 /** 66 * Table for calculating digits, used in Character, Long, and Integer. 67 */ 68 static final char[] digits = { 69 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 70 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 71 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 72 'u', 'v', 'w', 'x', 'y', 'z', 73 }; 74 75 /** 76 * The basic constructor (often called implicitly). 77 */ Number()78 public Number() 79 { 80 } 81 82 /** 83 * Return the value of this <code>Number</code> as an <code>int</code>. 84 * 85 * @return the int value 86 */ intValue()87 public abstract int intValue(); 88 89 /** 90 * Return the value of this <code>Number</code> as a <code>long</code>. 91 * 92 * @return the long value 93 */ longValue()94 public abstract long longValue(); 95 96 /** 97 * Return the value of this <code>Number</code> as a <code>float</code>. 98 * 99 * @return the float value 100 */ floatValue()101 public abstract float floatValue(); 102 103 /** 104 * Return the value of this <code>Number</code> as a <code>float</code>. 105 * 106 * @return the double value 107 */ doubleValue()108 public abstract double doubleValue(); 109 110 /** 111 * Return the value of this <code>Number</code> as a <code>byte</code>. 112 * 113 * @return the byte value 114 * @since 1.1 115 */ byteValue()116 public byte byteValue() 117 { 118 return (byte) intValue(); 119 } 120 121 /** 122 * Return the value of this <code>Number</code> as a <code>short</code>. 123 * 124 * @return the short value 125 * @since 1.1 126 */ shortValue()127 public short shortValue() 128 { 129 return (short) intValue(); 130 } 131 } 132