/* Short.java -- object wrapper for short Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the 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, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package java.lang; /** * Instances of class Short represent primitive * short values. * * Additionally, this class provides various helper functions and variables * related to shorts. * * @author Paul Fisher * @author John Keiser * @author Eric Blake * @since 1.1 * @status updated to 1.4 */ public final class Short extends Number implements Comparable { /** * Compatible with JDK 1.1+. */ private static final long serialVersionUID = 7515723908773894738L; /** * The minimum value a short can represent is -32768 (or * -215short can represent is 32767 (or * 215short is represented by this * Class object. */ public static final Class TYPE = VMClassLoader.getPrimitiveClass('S'); /** * The immutable value of this Short. * * @serial the wrapped short */ private final short value; /** * Create a Short object representing the value of the * short argument. * * @param value the value to use */ public Short(short value) { this.value = value; } /** * Create a Short object representing the value of the * argument after conversion to a short. * * @param s the string to convert * @throws NumberFormatException if the String cannot be parsed */ public Short(String s) { value = parseShort(s, 10); } /** * Converts the short to a String and assumes * a radix of 10. * * @param s the short to convert to String * @return the String representation of the argument */ public static String toString(short s) { return String.valueOf(s); } /** * Converts the specified String into a short. * This function assumes a radix of 10. * * @param s the String to convert * @return the short value of s * @throws NumberFormatException if s cannot be parsed as a * short */ public static short parseShort(String s) { return parseShort(s, 10); } /** * Converts the specified String into a short * using the specified radix (base). The string must not be null * or empty. It may begin with an optional '-', which will negate the answer, * provided that there are also valid digits. Each digit is parsed as if by * Character.digit(d, radix), and must be in the range * 0 to radix - 1. Finally, the result must be * within MIN_VALUE to MAX_VALUE, inclusive. * Unlike Double.parseDouble, you may not have a leading '+'. * * @param s the String to convert * @param radix the radix (base) to use in the conversion * @return the String argument converted to short * @throws NumberFormatException if s cannot be parsed as a * short */ public static short parseShort(String s, int radix) { int i = Integer.parseInt(s, radix, false); if ((short) i != i) throw new NumberFormatException(); return (short) i; } /** * Creates a new Short object using the String * and specified radix (base). * * @param s the String to convert * @param radix the radix (base) to convert with * @return the new Short * @throws NumberFormatException if s cannot be parsed as a * short * @see #parseShort(String, int) */ public static Short valueOf(String s, int radix) { return new Short(parseShort(s, radix)); } /** * Creates a new Short object using the String, * assuming a radix of 10. * * @param s the String to convert * @return the new Short * @throws NumberFormatException if s cannot be parsed as a * short * @see #Short(String) * @see #parseShort(String) */ public static Short valueOf(String s) { return new Short(parseShort(s, 10)); } /** * Convert the specified String into a Short. * The String may represent decimal, hexadecimal, or * octal numbers. * *

The extended BNF grammar is as follows:
*

   * DecodableString:
   *      ( [ - ] DecimalNumber )
   *    | ( [ - ] ( 0x | 0X
   *              | # ) HexDigit { HexDigit } )
   *    | ( [ - ] 0 { OctalDigit } )
   * DecimalNumber:
   *        DecimalDigit except '0' { DecimalDigit }
   * DecimalDigit:
   *        Character.digit(d, 10) has value 0 to 9
   * OctalDigit:
   *        Character.digit(d, 8) has value 0 to 7
   * DecimalDigit:
   *        Character.digit(d, 16) has value 0 to 15
   * 
* Finally, the value must be in the range MIN_VALUE to * MAX_VALUE, or an exception is thrown. * * @param s the String to interpret * @return the value of the String as a Short * @throws NumberFormatException if s cannot be parsed as a * short * @throws NullPointerException if s is null * @see Integer#decode(String) */ public static Short decode(String s) { int i = Integer.parseInt(s, 10, true); if ((short) i != i) throw new NumberFormatException(); return new Short((short) i); } /** * Return the value of this Short as a byte. * * @return the byte value */ public byte byteValue() { return (byte) value; } /** * Return the value of this Short. * * @return the short value */ public short shortValue() { return value; } /** * Return the value of this Short as an int. * * @return the int value */ public int intValue() { return value; } /** * Return the value of this Short as a long. * * @return the long value */ public long longValue() { return value; } /** * Return the value of this Short as a float. * * @return the float value */ public float floatValue() { return value; } /** * Return the value of this Short as a double. * * @return the double value */ public double doubleValue() { return value; } /** * Converts the Short value to a String and * assumes a radix of 10. * * @return the String representation of this Short */ public String toString() { return String.valueOf(value); } /** * Return a hashcode representing this Object. Short's hash * code is simply its value. * * @return this Object's hash code */ public int hashCode() { return value; } /** * Returns true if obj is an instance of * Short and represents the same short value. * * @param obj the object to compare * @return whether these Objects are semantically equal */ public boolean equals(Object obj) { return obj instanceof Short && value == ((Short) obj).value; } /** * Compare two Shorts numerically by comparing their short * values. The result is positive if the first is greater, negative if the * second is greater, and 0 if the two are equal. * * @param s the Short to compare * @return the comparison * @since 1.2 */ public int compareTo(Short s) { return value - s.value; } /** * Behaves like compareTo(Short) unless the Object * is not a Short. * * @param o the object to compare * @return the comparison * @throws ClassCastException if the argument is not a Short * @see #compareTo(Short) * @see Comparable * @since 1.2 */ public int compareTo(Object o) { return compareTo((Short)o); } }