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315 lines
9.6 KiB
Java
315 lines
9.6 KiB
Java
/* Byte.java -- object wrapper for byte
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Copyright (C) 1998, 2001 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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/**
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* Instances of class <code>Byte</code> represent primitive <code>byte</code>
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* values.
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*
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* Additionally, this class provides various helper functions and variables
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* useful to bytes.
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*
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* @author Paul Fisher
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* @author John Keiser
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* @author Per Bothner
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* @since JDK 1.0
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*/
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public final class Byte extends Number implements Comparable
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{
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static final long serialVersionUID = -7183698231559129828L;
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/**
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* The minimum value a <code>byte</code> can represent is -128.
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*/
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public static final byte MIN_VALUE = -128;
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/**
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* The maximum value a <code>byte</code> can represent is 127.
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*/
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public static final byte MAX_VALUE = 127;
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/**
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* The primitive type <code>byte</code> is represented by this
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* <code>Class</code> object.
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*/
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public static final Class TYPE = VMClassLoader.getPrimitiveClass('B');
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/**
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* The immutable value of this Byte.
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*/
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private final byte value;
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/**
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* Create a <code>Byte</code> object representing the value of the
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* <code>byte</code> argument.
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*
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* @param value the value to use
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*/
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public Byte(byte value)
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{
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this.value = value;
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}
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/**
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* Create a <code>Byte</code> object representing the value specified
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* by the <code>String</code> argument.
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*
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* @param s the string to convert.
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*/
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public Byte(String s) throws NumberFormatException
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{
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value = parseByte(s, 10);
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}
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/**
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* Return a hashcode representing this Object.
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*
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* <code>Byte</code>'s hash code is calculated by simply returning its
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* value.
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*
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* @return this Object's hash code.
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*/
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public int hashCode()
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{
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return value;
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}
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/**
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* Returns <code>true</code> if <code>obj</code> is an instance of
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* <code>Byte</code> and represents the same byte value.
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* @return whether these Objects are semantically equal.
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*/
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public boolean equals(Object obj)
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{
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return ((obj instanceof Byte) && (value == ((Byte)obj).byteValue()));
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}
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/**
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* Converts the <code>byte</code> to a <code>String</code> and assumes
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* a radix of 10.
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* @param i the <code>byte</code> to convert to <code>String</code>
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* @return the <code>String</code> representation of the argument.
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*/
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public static String toString(byte i)
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{
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return Integer.toString ((int) i);
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}
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/**
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* Converts the <code>Byte</code> value to a <code>String</code> and
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* assumes a radix of 10.
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* @return the <code>String</code> representation of this <code>Byte</code>.
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*/
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public String toString()
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{
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return Integer.toString ((int) value);
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}
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/**
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* Creates a new <code>Byte</code> object using the <code>String</code>,
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* assuming a radix of 10.
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* @param s the <code>String</code> to convert.
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* @return the new <code>Byte</code>.
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* @see #Byte(java.lang.String)
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* @see #parseByte(java.lang.String)
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>byte</code>.
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*/
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public static Byte valueOf(String s) throws NumberFormatException
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{
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return new Byte(parseByte(s));
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}
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/**
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* Creates a new <code>Byte</code> object using the <code>String</code>
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* and specified radix (base).
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* @param s the <code>String</code> to convert.
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* @param radix the radix (base) to convert with.
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* @return the new <code>Byte</code>.
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* @see #parseByte(java.lang.String,int)
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>byte</code>.
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*/
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public static Byte valueOf(String s, int radix)
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throws NumberFormatException
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{
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return new Byte(parseByte(s, radix));
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}
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/**
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* Converts the specified <code>String</code> into a <code>byte</code>.
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* This function assumes a radix of 10.
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*
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* @param s the <code>String</code> to convert
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* @return the <code>byte</code> value of the <code>String</code>
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* argument.
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>byte</code>.
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*/
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public static byte parseByte(String s) throws NumberFormatException
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{
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return parseByte(s, 10);
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}
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/**
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* Converts the specified <code>String</code> into a <code>byte</code>
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* using the specified radix (base).
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*
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* @param str the <code>String</code> to convert
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* @param radix the radix (base) to use in the conversion
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* @return the <code>String</code> argument converted to </code>byte</code>.
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>byte</code>.
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*/
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public static byte parseByte(String str, int radix)
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throws NumberFormatException
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{
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int i = Integer.parseInt(str, radix);
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if (i < MIN_VALUE || i > MAX_VALUE)
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throw new NumberFormatException();
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return (byte) i;
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}
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/**
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* Convert the specified <code>String</code> into a <code>Byte</code>.
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* The <code>String</code> may represent decimal, hexadecimal, or
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* octal numbers.
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*
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* The <code>String</code> argument is interpreted based on the leading
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* characters. Depending on what the String begins with, the base will be
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* interpreted differently:
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*
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* <table>
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* <tr><th>Leading<br>Characters</th><th>Base</th></tr>
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* <tr><td>#</td><td>16</td></tr>
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* <tr><td>0x</td><td>16</td></tr>
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* <tr><td>0X</td><td>16</td></tr>
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* <tr><td>0</td><td>8</td></tr>
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* <tr><td>Anything<br>Else</td><td>10</td></tr>
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* </table>
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*
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* @param str the <code>String</code> to interpret.
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* @return the value of the String as a <code>Byte</code>.
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>byte</code>.
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*/
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public static Byte decode(String str) throws NumberFormatException
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{
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int i = (Integer.decode(str)).intValue();
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if (i < MIN_VALUE || i > MAX_VALUE)
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throw new NumberFormatException();
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return new Byte((byte) i);
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}
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/** Return the value of this <code>Byte</code> as an <code>short</code>.
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** @return the value of this <code>Byte</code> as an <code>short</code>.
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**/
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public byte byteValue()
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{
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return value;
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}
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/** Return the value of this <code>Byte</code> as an <code>short</code>.
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** @return the value of this <code>Byte</code> as an <code>short</code>.
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**/
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public short shortValue()
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{
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return value;
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}
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/** Return the value of this <code>Byte</code> as an <code>int</code>.
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** @return the value of this <code>Byte</code> as an <code>int</code>.
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**/
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public int intValue()
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{
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return value;
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}
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/** Return the value of this <code>Byte</code> as a <code>long</code>.
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** @return the value of this <code>Byte</code> as a <code>long</code>.
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**/
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public long longValue()
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{
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return value;
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}
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/** Return the value of this <code>Byte</code> as a <code>float</code>.
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** @return the value of this <code>Byte</code> as a <code>float</code>.
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**/
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public float floatValue()
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{
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return value;
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}
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/** Return the value of this <code>Byte</code> as a <code>double</code>.
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** @return the value of this <code>Byte</code> as a <code>double</code>.
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**/
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public double doubleValue()
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{
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return value;
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}
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/**
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* Compare two Bytes numerically by comparing their
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* <code>byte</code> values.
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* @return a positive value if this <code>Byte</code> is greater
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* in value than the argument <code>Byte</code>; a negative value
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* if this <code>Byte</code> is smaller in value than the argument
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* <code>Byte</code>; and <code>0</code>, zero, if this
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* <code>Byte</code> is equal in value to the argument
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* <code>Byte</code>.
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*/
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public int compareTo(Byte b)
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{
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return (int)(value - b.byteValue());
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}
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/**
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* Behaves like <code>compareTo(java.lang.Byte)</code> unless the Object
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* is not a <code>Byte</code>. Then it throws a
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* <code>ClassCastException</code>.
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* @exception ClassCastException if the argument is not a
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* <code>Byte</code>.
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*/
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public int compareTo(Object o)
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{
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return compareTo((Byte)o);
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}
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}
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