308 lines
9.2 KiB
Java
308 lines
9.2 KiB
Java
/* java.lang.Short
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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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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.lang;
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/**
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* Instances of class <code>Short</code> represent primitive
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* <code>short</code> values.
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*
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* Additionally, this class provides various helper functions and variables
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* related to shorts.
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*
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* @author Paul Fisher
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* @author John Keiser
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* @since JDK 1.0
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*/
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public final class Short extends Number implements Comparable
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{
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static final long serialVersionUID = 7515723908773894738L;
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/**
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* The minimum value a <code>short</code> can represent is -32768.
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*/
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public static final short MIN_VALUE = -32768;
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/**
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* The minimum value a <code>short</code> can represent is 32767.
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*/
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public static final short MAX_VALUE = 32767;
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/**
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* The primitive type <code>short</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("short");
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/**
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* The immutable value of this Short.
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*/
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private final short value;
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/**
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* Create a <code>Short</code> object representing the value of the
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* <code>short</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 Short(short 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>Short</code> object representing the value of the
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* argument after conversion to a <code>short</code>.
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*
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* @param s the string to convert.
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*/
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public Short(String s) throws NumberFormatException
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{
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value = parseShort(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>Short</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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* If the <code>Object</code> is not <code>null</code>, is an
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* <code>instanceof</code> <code>Short</code>, and represents
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* the same primitive <code>short</code> value return
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* <code>true</code>. Otherwise <code>false</code> is returned.
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*/
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public boolean equals(Object obj)
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{
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return obj instanceof Short && ((Short)obj).value == value;
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}
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/**
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* Converts the <code>short</code> to a <code>String</code> and assumes
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* a radix of 10.
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* @param i the <code>short</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(short 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>Short</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>Short</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>Short</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>Short</code>.
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* @see #Short(java.lang.String)
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* @see #parseShort(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>short</code>.
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*/
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public static Short valueOf(String s) throws NumberFormatException
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{
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return new Short(parseShort(s));
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}
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/**
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* Creates a new <code>Short</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>Short</code>.
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* @see #parseShort(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>short</code>.
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*/
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public static Short valueOf(String s, int radix)
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throws NumberFormatException
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{
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return new Short(parseShort(s, radix));
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}
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/**
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* Converts the specified <code>String</code> into a <code>short</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>short</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>short</code>.
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*/
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public static short parseShort(String s) throws NumberFormatException
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{
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return parseShort(s, 10);
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}
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/**
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* Converts the specified <code>String</code> into a <code>short</code>
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* using the specified radix (base).
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*
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* @param s 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>short</code>.
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>short</code>.
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*/
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public static short parseShort(String s, int radix)
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throws NumberFormatException
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{
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int i = Integer.parseInt(s, radix);
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if (i < MIN_VALUE || i > MAX_VALUE)
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throw new NumberFormatException();
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return (short) i;
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}
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/**
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* Convert the specified <code>String</code> into a <code>Short</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 s the <code>String</code> to interpret.
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* @return the value of the String as a <code>Short</code>.
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* @exception NumberFormatException thrown if the <code>String</code>
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* cannot be parsed as a <code>short</code>.
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*/
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public static Short decode(String s) throws NumberFormatException
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{
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int i = (Integer.decode(s)).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 Short((short) i);
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}
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/** Return the value of this <code>Short</code> as an <code>short</code>.
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** @return the value of this <code>Short</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 (byte) value;
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}
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/** Return the value of this <code>Short</code> as an <code>short</code>.
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** @return the value of this <code>Short</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>Short</code> as an <code>int</code>.
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** @return the value of this <code>Short</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>Short</code> as a <code>long</code>.
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** @return the value of this <code>Short</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>Short</code> as a <code>float</code>.
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** @return the value of this <code>Short</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>Short</code> as a <code>double</code>.
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** @return the value of this <code>Short</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 Shorts numerically by comparing their
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* <code>short</code> values.
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* @return a positive value if this <code>Short</code> is greater
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* in value than the argument <code>Short</code>; a negative value
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* if this <code>Short</code> is smaller in value than the argument
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* <code>Short</code>; and <code>0</code>, zero, if this
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* <code>Short</code> is equal in value to the argument
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* <code>Short</code>.
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*
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* @since 1.2
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*/
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public int compareTo(Short s)
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{
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return value - s.value;
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}
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/**
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* Behaves like <code>compareTo(java.lang.Short)</code> unless the Object
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* is not a <code>Short</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>Short</code>.
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*
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* @since 1.2
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*/
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public int compareTo(Object o)
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{
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return compareTo((Short)o);
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}
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}
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