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jeremybenn |
/* Number.java =- abstract superclass of numeric objects
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Copyright (C) 1998, 2001, 2002, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import java.io.Serializable;
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/**
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* Number is a generic superclass of all the numeric classes, including
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* the wrapper classes {@link Byte}, {@link Short}, {@link Integer},
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* {@link Long}, {@link Float}, and {@link Double}. Also worth mentioning
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* are the classes in {@link java.math}.
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*
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* It provides ways to convert numeric objects to any primitive.
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*
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* @author Paul Fisher
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* @author John Keiser
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* @author Warren Levy
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* @author Eric Blake (ebb9@email.byu.edu)
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* @since 1.0
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* @status updated to 1.4
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*/
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public abstract class Number implements Serializable
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{
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/**
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* Compatible with JDK 1.1+.
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*/
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private static final long serialVersionUID = -8742448824652078965L;
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/**
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* Table for calculating digits, used in Character, Long, and Integer.
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*/
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static final char[] digits = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
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'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z',
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};
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/**
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* The basic constructor (often called implicitly).
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*/
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public Number()
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{
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}
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/**
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* Return the value of this <code>Number</code> as an <code>int</code>.
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*
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* @return the int value
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*/
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public abstract int intValue();
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/**
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* Return the value of this <code>Number</code> as a <code>long</code>.
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*
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* @return the long value
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*/
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public abstract long longValue();
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/**
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* Return the value of this <code>Number</code> as a <code>float</code>.
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*
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* @return the float value
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*/
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public abstract float floatValue();
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/**
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* Return the value of this <code>Number</code> as a <code>float</code>.
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*
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* @return the double value
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*/
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public abstract double doubleValue();
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/**
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* Return the value of this <code>Number</code> as a <code>byte</code>.
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*
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* @return the byte value
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* @since 1.1
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*/
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public byte byteValue()
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{
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return (byte) intValue();
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}
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/**
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* Return the value of this <code>Number</code> as a <code>short</code>.
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*
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* @return the short value
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* @since 1.1
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*/
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public short shortValue()
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{
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return (short) intValue();
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}
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}
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