short.java

已经移植好的java虚拟机

/*
 * Copyright 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the proprietary information of Sun Microsystems, Inc.
 * Use is subject to license terms.
 *
 */

package java.lang;

/**
 * The Short class is the standard wrapper for short values.
 *
 * @author  Nakul Saraiya
 * @version 1.21, 12/04/99 (CLDC 1.0, Spring 2000)
 * @since   JDK1.1, CLDC 1.0
 */
public final
class Short {

    /**
     * The minimum value a Short can have.
     */
    public static final short   MIN_VALUE = -32768;

    /**
     * The maximum value a Short can have.
     */
    public static final short   MAX_VALUE = 32767;

    /**
     * Assuming the specified String represents a short, returns
     * that short's value. Throws an exception if the String cannot
     * be parsed as a short.  The radix is assumed to be 10.
     *
     * @param s       the String containing the short
     * @return short  the value represented by the specified string
     * @exception     NumberFormatException If the string does not
     *                contain a parsable short.
     */
    public static short parseShort(String s) throws NumberFormatException {
      return parseShort(s, 10);
    }

    /**
     * Assuming the specified String represents a short, returns
     * that short's value. Throws an exception if the String cannot
     * be parsed as a short.
     *
     * @param s       the String containing the short
     * @param radix   the radix to be used
     * @return        The short value represented by the specified string in
     *                the specified radix.
     * @exception     NumberFormatException If the String does not
     *                contain a parsable short.
     */
    public static short parseShort(String s, int radix)
      throws NumberFormatException {
      int i = Integer.parseInt(s, radix);
      if (i < MIN_VALUE || i > MAX_VALUE)
          throw new NumberFormatException();
      return (short)i;
    }

    /**
     * The value of the Short.
     *
     * @serial
     */
    private short value;

    /**
     * Constructs a Short object initialized to the specified short value.
     *
     * @param value     the initial value of the Short
     */
    public Short(short value) {
        this.value = value;
    }

    /**
     * Returns the value of this Short as a short.
     *
     * @return the value of this Short as a short.
     */
    public short shortValue() {
      return value;
    }

    /**
     * Returns a String object representing this Short's value.
     */
    public String toString() {
      return String.valueOf((int)value);
    }

    /**
     * Returns a hashcode for this Short.
     */
    public int hashCode() {
        return (int)value;
    }

    /**
     * Compares this object to the specified object.
     *
     * @param obj       the object to compare with
     * @return          true if the objects are the same; false otherwise.
     */
    public boolean equals(Object obj) {
        if (obj instanceof Short) {
            return value == ((Short)obj).shortValue();
        }
        return false;
    }

}