1 /* Number.java =- abstract superclass of numeric objects
2 Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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)
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.
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., 59 Temple Place, Suite 330, Boston, MA
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
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. */
41 import java
.io
.Serializable
;
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}.
49 * It provides ways to convert numeric objects to any primitive.
54 * @author Eric Blake (ebb9@email.byu.edu)
56 * @status updated to 1.4
58 public abstract class Number
implements Serializable
61 * Compatible with JDK 1.1+.
63 private static final long serialVersionUID
= -8742448824652078965L;
66 * Table for calculating digits, used in Character, Long, and Integer.
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',
76 * The basic constructor (often called implicitly).
83 * Return the value of this <code>Number</code> as an <code>int</code>.
85 * @return the int value
87 public abstract int intValue();
90 * Return the value of this <code>Number</code> as a <code>long</code>.
92 * @return the long value
94 public abstract long longValue();
97 * Return the value of this <code>Number</code> as a <code>float</code>.
99 * @return the float value
101 public abstract float floatValue();
104 * Return the value of this <code>Number</code> as a <code>float</code>.
106 * @return the double value
108 public abstract double doubleValue();
111 * Return the value of this <code>Number</code> as a <code>byte</code>.
113 * @return the byte value
116 public byte byteValue()
118 return (byte) intValue();
122 * Return the value of this <code>Number</code> as a <code>short</code>.
124 * @return the short value
127 public short shortValue()
129 return (short) intValue();