/* 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 modifyit under the terms of the GNU General Public License as published bythe 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, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU Classpath; see the file COPYING.  If not, write to theFree Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA02110-1301 USA.Linking this library statically or dynamically with other modules ismaking a combined work based on this library.  Thus, the terms andconditions of the GNU General Public License cover the wholecombination.As a special exception, the copyright holders of this library give youpermission to link this library with independent modules to produce anexecutable, regardless of the license terms of these independentmodules, and to copy and distribute the resulting executable underterms of your choice, provided that you also meet, for each linkedindependent module, the terms and conditions of the license of thatmodule.  An independent module is a module which is not derived fromor based on this library.  If you modify this library, you may extendthis exception to your version of the library, but you are notobligated to do so.  If you do not wish to do so, delete thisexception 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();  }}