byte.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

     * The sequence of characters following an (optional) negative
     * sign and/or radix specifier (&quot;<code>0x</code>&quot;,
     * &quot;<code>0X</code>&quot;, &quot;<code>#</code>&quot;, or
     * leading zero) is parsed as by the <code>Byte.parseByte</code>
     * method with the indicated radix (10, 16, or 8).  This sequence
     * of characters must represent a positive value or a {@link
     * NumberFormatException} will be thrown.  The result is negated
     * if first character of the specified <code>String</code> is the
     * minus sign.  No whitespace characters are permitted in the
     * <code>String</code>.
     *
     * @param     nm the <code>String</code> to decode.
     * @return 	 a <code>Byte</code> object holding the <code>byte</code>
     * 		value represented by <code>nm</code>
     * @exception NumberFormatException  if the <code>String</code> does not
     *            contain a parsable <code>byte</code>.
     * @see java.lang.Byte#parseByte(java.lang.String, int)
     */
    public static Byte decode(String nm) throws NumberFormatException {
        int radix = 10;
        int index = 0;
        boolean negative = false;
        Byte result;

        // Handle minus sign, if present
        if (nm.startsWith("-")) {
            negative = true;
            index++;
        }

	if (nm.startsWith("0x", index) || nm.startsWith("0X", index)) {
            index += 2;
            radix = 16;
	} else if (nm.startsWith("#", index)) {
	    index++;
            radix = 16;
	} else if (nm.startsWith("0", index) && nm.length() > 1 + index) {
	    index++;
            radix = 8;
	}

        if (nm.startsWith("-", index))
            throw new NumberFormatException("Negative sign in wrong position");

        try {
            result = Byte.valueOf(nm.substring(index), radix);
            result = negative ? new Byte((byte)-result.byteValue()) : result;
        } catch (NumberFormatException e) {
            // If number is Byte.MIN_VALUE, we'll end up here. The next line
            // handles this case, and causes any genuine format error to be
            // rethrown.
            String constant = negative ? new String("-" + nm.substring(index))
                                       : nm.substring(index);
            result = Byte.valueOf(constant, radix);
        }
        return result;
    }

    /**
     * The value of the <code>Byte</code>.
     *
     * @serial
     */
    private byte value;

    /**
     * Constructs a newly allocated <code>Byte</code> object that
     * represents the specified <code>byte</code> value.
     *
     * @param value	the value to be represented by the 
     *			<code>Byte</code>.
     */
    public Byte(byte value) {
	this.value = value;
    }

    /**
     * Constructs a newly allocated <code>Byte</code> object that
     * represents the <code>byte</code> value indicated by the
     * <code>String</code> parameter. The string is converted to a
     * <code>byte</code> value in exactly the manner used by the
     * <code>parseByte</code> method for radix 10.
     *
     * @param s		the <code>String</code> to be converted to a 
     *			<code>Byte</code>
     * @exception	NumberFormatException If the <code>String</code> 
     *			does not contain a parsable <code>byte</code>.
     * @see        java.lang.Byte#parseByte(java.lang.String, int)
     */
    public Byte(String s) throws NumberFormatException {
	this.value = parseByte(s, 10);
    }

    /**
     * Returns the value of this <code>Byte</code> as a
     * <code>byte</code>.
     */
    public byte byteValue() {
	return value;
    }

    /**
     * Returns the value of this <code>Byte</code> as a
     * <code>short</code>.
     */
    public short shortValue() {
	return (short)value;
    }

    /**
     * Returns the value of this <code>Byte</code> as an
     * <code>int</code>.
     */
    public int intValue() {
	return (int)value;
    }

    /**
     * Returns the value of this <code>Byte</code> as a
     * <code>long</code>.
     */
    public long longValue() {
	return (long)value;
    }

    /**
     * Returns the value of this <code>Byte</code> as a
     * <code>float</code>.
     */
    public float floatValue() {
	return (float)value;
    }

    /**
     * Returns the value of this <code>Byte</code> as a
     * <code>double</code>.
     */
    public double doubleValue() {
	return (double)value;
    }

    /**
     * Returns a <code>String</code> object representing this
     * <code>Byte</code>'s value.  The value is converted to signed
     * decimal representation and returned as a string, exactly as if
     * the <code>byte</code> value were given as an argument to the
     * {@link java.lang.Byte#toString(byte)} method.
     *
     * @return  a string representation of the value of this object in
     *          base&nbsp;10.
     */
    public String toString() {
	return String.valueOf((int)value);
    }

    /**
     * Returns a hash code for this <code>Byte</code>.
     */
    public int hashCode() {
	return (int)value;
    }

    /**
     * Compares this object to the specified object.  The result is
     * <code>true</code> if and only if the argument is not
     * <code>null</code> and is a <code>Byte</code> object that
     * contains the same <code>byte</code> value as this object.
     *
     * @param obj	the object to compare with
     * @return 		<code>true</code> if the objects are the same;
     * 			<code>false</code> otherwise.
     */
    public boolean equals(Object obj) {
	if (obj instanceof Byte) {
	    return value == ((Byte)obj).byteValue();
	}
	return false;
    }

    /**
     * Compares two <code>Byte</code> objects numerically.
     *
     * @param   anotherByte   the <code>Byte</code> to be compared.
     * @return	the value <code>0</code> if this <code>Byte</code> is
     * 		equal to the argument <code>Byte</code>; a value less than
     * 		<code>0</code> if this <code>Byte</code> is numerically less
     * 		than the argument <code>Byte</code>; and a value greater than
     * 		 <code>0</code> if this <code>Byte</code> is numerically
     * 		 greater than the argument <code>Byte</code> (signed
     * 		 comparison).
     * @since   1.2
     */
    public int compareTo(Byte anotherByte) {
	return this.value - anotherByte.value;
    }

    /**
     * Compares this <code>Byte</code> object to another object.  If the
     * object is a <code>Byte</code>, this function behaves like
     * <code>compareTo(Byte)</code>.  Otherwise, it throws a
     * <code>ClassCastException</code> (as <code>Byte</code> objects
     * are only comparable to other <code>Byte</code> objects).
     *
     * @param   o the <code>Object</code> to be compared.
     * @return  the value <code>0</code> if the argument is a <code>Byte</code>
     *		numerically equal to this <code>Byte</code>; a value less than
     *		<code>0</code> if the argument is a <code>Byte</code> 
     *		numerically greater than this <code>Byte</code>; and a 
     *		value greater than <code>0</code> if the argument is a
     *		 <code>Byte</code> numerically less than this 
     *		<code>Byte</code>.
     * @exception <code>ClassCastException</code> if the argument is not a
     *		  <code><code>Byte</code></code>. 
     * @see     java.lang.Comparable
     * @since   1.2
     */
    public int compareTo(Object o) {
	return compareTo((Byte)o);
    }

    /** use serialVersionUID from JDK 1.1. for interoperability */
    private static final long serialVersionUID = -7183698231559129828L;

}