Class: java.lang.Byte

The Byte class wraps a value of primitive type byte in an object. An object of type Byte contains a single field whose type is byte.

In addition, this class provides several methods for converting a byte to a String and a String to a byte, as well as other constants and methods useful when dealing with a byte.

Authors:
@author Nakul Saraiya
See:
@see Number
Version:
@version 1.40, 05/11/04
Since:
@since JDK1.1

Inheritance

Superclass tree: Implements:

Methods

  • Bytetop

    public Byte(byte value)
    Constructs a newly allocated Byte object that represents the specified byte value.
    Parameters:
    @param value the value to be represented by the Byte.
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  • Bytetop

    public Byte(String s) throws NumberFormatException
    Constructs a newly allocated Byte object that represents the byte value indicated by the String parameter. The string is converted to a byte value in exactly the manner used by the parseByte method for radix 10.
    Parameters:
    @param s the String to be converted to a Byte
    Exceptions:
    @exception NumberFormatException If the String does not contain a parsable byte.
    See:
    @see Byte.parseByte(java.lang.String, int)
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  • byteValuetop

    public byte byteValue()
    Returns the value of this Byte as a byte.
    Return:
    @return the numeric value represented by this object after conversion to type byte.
    Override hierarchy:
    byteValue from Number
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  • compareTotop

    public int compareTo(Byte anotherByte)
    Compares two Byte objects numerically.
    Parameters:
    @param anotherByte the Byte to be compared.
    Return:
    @return the value 0 if this Byte is equal to the argument Byte; a value less than 0 if this Byte is numerically less than the argument Byte; and a value greater than 0 if this Byte is numerically greater than the argument Byte (signed comparison).
    Since:
    @since 1.2
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  • decodetop

    public static Byte decode(String nm) throws NumberFormatException
    Decodes a String into a Byte. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:
    DecodableString:
    Signopt DecimalNumeral
    Signopt 0x HexDigits
    Signopt 0X HexDigits
    Signopt # HexDigits
    Signopt 0 OctalDigits

    Sign:
    -
    DecimalNumeral, HexDigits, and OctalDigits are defined in §3.10.1 of the Java Language Specification.

    The sequence of characters following an (optional) negative sign and/or radix specifier ("0x", "0X", "#", or leading zero) is parsed as by the Byte.parseByte method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a NumberFormatException will be thrown. The result is negated if first character of the specified String is the minus sign. No whitespace characters are permitted in the String.

    Parameters:
    @param nm the String to decode.
    Return:
    @return a Byte object holding the byte value represented by nm
    Exceptions:
    @exception NumberFormatException if the String does not contain a parsable byte.
    See:
    @see Byte.parseByte(java.lang.String, int)
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  • doubleValuetop

    public double doubleValue()
    Returns the value of this Byte as a double.
    Return:
    @return the numeric value represented by this object after conversion to type double.
    Override hierarchy:
    doubleValue from Number
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  • equalstop

    public boolean equals(Object obj)
    Compares this object to the specified object. The result is true if and only if the argument is not null and is a Byte object that contains the same byte value as this object.
    Parameters:
    @param obj the object to compare with
    Return:
    @return true if the objects are the same; false otherwise.
    Override hierarchy:
    equals from Object
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  • floatValuetop

    public float floatValue()
    Returns the value of this Byte as a float.
    Return:
    @return the numeric value represented by this object after conversion to type float.
    Override hierarchy:
    floatValue from Number
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  • hashCodetop

    public int hashCode()
    Returns a hash code for this Byte.
    Return:
    @return a hash code value for this object.
    Override hierarchy:
    hashCode from Object
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  • intValuetop

    public int intValue()
    Returns the value of this Byte as an int.
    Return:
    @return the numeric value represented by this object after conversion to type int.
    Override hierarchy:
    intValue from Number
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  • longValuetop

    public long longValue()
    Returns the value of this Byte as a long.
    Return:
    @return the numeric value represented by this object after conversion to type long.
    Override hierarchy:
    longValue from Number
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  • parseBytetop

    public static byte parseByte(String s) throws NumberFormatException
    Parses the string argument as a signed decimal byte. The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting byte value is returned, exactly as if the argument and the radix 10 were given as arguments to the Byte.parseByte(java.lang.String, int) method.
    Parameters:
    @param s a String containing the byte representation to be parsed
    Return:
    @return the byte value represented by the argument in decimal
    Exceptions:
    @exception NumberFormatException if the string does not contain a parsable byte.
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  • parseBytetop

    public static byte parseByte(String s, int radix) throws NumberFormatException
    Parses the string argument as a signed byte in the radix specified by the second argument. The characters in the string must all be digits, of the specified radix (as determined by whether Character.digit(char, int) returns a nonnegative value) except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting byte value is returned.

    An exception of type NumberFormatException is thrown if any of the following situations occurs:

    • The first argument is null or is a string of length zero.
    • The radix is either smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX.
    • Any character of the string is not a digit of the specified radix, except that the first character may be a minus sign '-' ('\u002D') provided that the string is longer than length 1.
    • The value represented by the string is not a value of type byte.
    Parameters:
    @param s the String containing the byte representation to be parsed
    @param radix the radix to be used while parsing s
    Return:
    @return the byte value represented by the string argument in the specified radix
    Exceptions:
    @exception NumberFormatException If the string does not contain a parsable byte.
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  • shortValuetop

    public short shortValue()
    Returns the value of this Byte as a short.
    Return:
    @return the numeric value represented by this object after conversion to type short.
    Override hierarchy:
    shortValue from Number
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  • toStringtop

    public String toString()
    Returns a String object representing this Byte's value. The value is converted to signed decimal representation and returned as a string, exactly as if the byte value were given as an argument to the Byte.toString(byte) method.
    Return:
    @return a string representation of the value of this object in base 10.
    Override hierarchy:
    toString from Object
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  • toStringtop

    public static String toString(byte b)
    Returns a new String object representing the specified byte. The radix is assumed to be 10.
    Parameters:
    @param b the byte to be converted
    Return:
    @return the string representation of the specified byte
    See:
    @see Integer.toString(int)
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  • valueOftop

    public static Byte valueOf(byte b)
    Returns a Byte instance representing the specified byte value. If a new Byte instance is not required, this method should generally be used in preference to the constructor Byte.Byte(byte), as this method is likely to yield significantly better space and time performance by caching frequently requested values.
    Parameters:
    @param b a byte value.
    Return:
    @return a Byte instance representing b.
    Since:
    @since 1.5
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  • valueOftop

    public static Byte valueOf(String s) throws NumberFormatException
    Returns a Byte object holding the value given by the specified String. The argument is interpreted as representing a signed decimal byte, exactly as if the argument were given to the Byte.parseByte(java.lang.String) method. The result is a Byte object that represents the byte value specified by the string.

    In other words, this method returns a Byte object equal to the value of:

    new Byte(Byte.parseByte(s))
    Parameters:
    @param s the string to be parsed
    Return:
    @return a Byte object holding the value represented by the string argument
    Exceptions:
    @exception NumberFormatException If the String does not contain a parsable byte.
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  • valueOftop

    public static Byte valueOf(String s, int radix) throws NumberFormatException
    Returns a Byte object holding the value extracted from the specified String when parsed with the radix given by the second argument. The first argument is interpreted as representing a signed byte in the radix specified by the second argument, exactly as if the argument were given to the Byte.parseByte(java.lang.String, int) method. The result is a Byte object that represents the byte value specified by the string.

    In other words, this method returns a Byte object equal to the value of:

    new Byte(Byte.parseByte(s, radix))
    Parameters:
    @param s the string to be parsed
    @param radix the radix to be used in interpreting s
    Return:
    @return a Byte object holding the value represented by the string argument in the specified radix.
    Exceptions:
    @exception NumberFormatException If the String does not contain a parsable byte.
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Fields

  • MAX_VALUE

    public static final byte MAX_VALUE = 127
    A constant holding the maximum value a byte can have, 27-1.

  • MIN_VALUE

    public static final byte MIN_VALUE = -128
    A constant holding the minimum value a byte can have, -27.

  • SIZE

    public static final int SIZE = 8
    The number of bits used to represent a byte value in two's complement binary form.

  • TYPE

    public static final Class<Byte> TYPE
    The Class instance representing the primitive type byte.