public final class Byte extends Number implements Comparable<Byte>
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
.
Number
,
Serialized FormModifier and Type | Field and Description |
---|---|
static int |
BYTES
The number of bytes used to represent a
byte value in two's
complement binary form. |
static byte |
MAX_VALUE
A constant holding the maximum value a
byte can
have, 27-1. |
static byte |
MIN_VALUE
A constant holding the minimum value a
byte can
have, -27. |
static int |
SIZE
The number of bits used to represent a
byte value in two's
complement binary form. |
static Class<Byte> |
TYPE
The
Class instance representing the primitive type
byte . |
Constructor and Description |
---|
Byte(byte value)
Constructs a newly allocated
Byte object that
represents the specified byte value. |
Byte(String s)
Constructs a newly allocated
Byte object that
represents the byte value indicated by the
String parameter. |
Modifier and Type | Method and Description |
---|---|
byte |
byteValue()
Returns the value of this
Byte as a
byte . |
static int |
compare(byte x,
byte y)
Compares two
byte values numerically. |
int |
compareTo(Byte anotherByte)
Compares two
Byte objects numerically. |
static Byte |
decode(String nm)
Decodes a
String into a Byte . |
double |
doubleValue()
Returns the value of this
Byte as a double
after a widening primitive conversion. |
boolean |
equals(Object obj)
Compares this object to the specified object.
|
float |
floatValue()
Returns the value of this
Byte as a float after
a widening primitive conversion. |
int |
hashCode()
Returns a hash code for this
Byte ; equal to the result
of invoking intValue() . |
static int |
hashCode(byte value)
Returns a hash code for a
byte value; compatible with
Byte.hashCode() . |
int |
intValue()
Returns the value of this
Byte as an int after
a widening primitive conversion. |
long |
longValue()
Returns the value of this
Byte as a long after
a widening primitive conversion. |
static byte |
parseByte(String s)
Parses the string argument as a signed decimal
byte . |
static byte |
parseByte(String s,
int radix)
Parses the string argument as a signed
byte in the
radix specified by the second argument. |
short |
shortValue()
Returns the value of this
Byte as a short after
a widening primitive conversion. |
String |
toString()
Returns a
String object representing this
Byte 's value. |
static String |
toString(byte b)
Returns a new
String object representing the
specified byte . |
static int |
toUnsignedInt(byte x)
Converts the argument to an
int by an unsigned
conversion. |
static long |
toUnsignedLong(byte x)
Converts the argument to a
long by an unsigned
conversion. |
static Byte |
valueOf(byte b)
Returns a
Byte instance representing the specified
byte value. |
static Byte |
valueOf(String s)
Returns a
Byte object holding the value
given by the specified String . |
static Byte |
valueOf(String s,
int radix)
Returns a
Byte object holding the value
extracted from the specified String when parsed
with the radix given by the second argument. |
public static final byte MIN_VALUE
byte
can
have, -27.public static final byte MAX_VALUE
byte
can
have, 27-1.public static final int SIZE
byte
value in two's
complement binary form.public static final int BYTES
byte
value in two's
complement binary form.public Byte(byte value)
Byte
object that
represents the specified byte
value.value
- the value to be represented by the
Byte
.public Byte(String s) throws NumberFormatException
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.s
- the String
to be converted to a
Byte
NumberFormatException
- If the String
does not contain a parsable byte
.parseByte(java.lang.String, int)
public static String toString(byte b)
String
object representing the
specified byte
. The radix is assumed to be 10.b
- the byte
to be convertedbyte
Integer.toString(int)
public static Byte valueOf(byte b)
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)
, as this method is likely to yield
significantly better space and time performance since
all byte values are cached.b
- a byte value.Byte
instance representing b
.public static byte parseByte(String s, int radix) throws NumberFormatException
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 or an
ASCII plus sign '+'
('\u002B'
) to
indicate a positive value. The resulting byte
value is
returned.
An exception of type NumberFormatException
is
thrown if any of the following situations occurs:
null
or is a string of
length zero.
Character.MIN_RADIX
or larger than Character.MAX_RADIX
.
'-'
('\u002D'
) or plus sign
'+'
('\u002B'
) provided that the
string is longer than length 1.
byte
.
s
- the String
containing the
byte
representation to be parsedradix
- the radix to be used while parsing s
byte
value represented by the string
argument in the specified radixNumberFormatException
- If the string does
not contain a parsable byte
.public static byte parseByte(String s) throws NumberFormatException
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 or an ASCII plus sign '+'
('\u002B'
) to indicate a positive value. The
resulting byte
value is returned, exactly as if the
argument and the radix 10 were given as arguments to the parseByte(java.lang.String, int)
method.s
- a String
containing the
byte
representation to be parsedbyte
value represented by the
argument in decimalNumberFormatException
- if the string does not
contain a parsable byte
.public static Byte valueOf(String s, int radix) throws NumberFormatException
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 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))
s
- the string to be parsedradix
- the radix to be used in interpreting s
Byte
object holding the value
represented by the string argument in the
specified radix.NumberFormatException
- If the String
does
not contain a parsable byte
.public static Byte valueOf(String s) throws NumberFormatException
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 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))
s
- the string to be parsedByte
object holding the value
represented by the string argumentNumberFormatException
- If the String
does
not contain a parsable byte
.public static Byte decode(String nm) throws NumberFormatException
String
into a Byte
.
Accepts decimal, hexadecimal, and octal numbers given by
the following grammar:
DecimalNumeral, HexDigits, and OctalDigits are as defined in section 3.10.1 of The Java™ Language Specification, except that underscores are not accepted between digits.
- DecodableString:
- Signopt DecimalNumeral
- Signopt
0x
HexDigits- Signopt
0X
HexDigits- Signopt
#
HexDigits- Signopt
0
OctalDigits- Sign:
-
+
The sequence of characters following an optional
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
.
nm
- the String
to decode.Byte
object holding the byte
value represented by nm
NumberFormatException
- if the String
does not
contain a parsable byte
.parseByte(java.lang.String, int)
public byte byteValue()
Byte
as a
byte
.public short shortValue()
Byte
as a short
after
a widening primitive conversion.shortValue
in class Number
short
.public int intValue()
Byte
as an int
after
a widening primitive conversion.public long longValue()
Byte
as a long
after
a widening primitive conversion.public float floatValue()
Byte
as a float
after
a widening primitive conversion.floatValue
in class Number
float
.public double doubleValue()
Byte
as a double
after a widening primitive conversion.doubleValue
in class Number
double
.public String toString()
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
toString(byte)
method.public int hashCode()
Byte
; equal to the result
of invoking intValue()
.hashCode
in class Object
Byte
Object.equals(java.lang.Object)
,
System.identityHashCode(java.lang.Object)
public static int hashCode(byte value)
byte
value; compatible with
Byte.hashCode()
.value
- the value to hashbyte
value.public boolean equals(Object obj)
true
if and only if the argument is not
null
and is a Byte
object that
contains the same byte
value as this object.equals
in class Object
obj
- the object to compare withtrue
if the objects are the same;
false
otherwise.Object.hashCode()
,
HashMap
public int compareTo(Byte anotherByte)
Byte
objects numerically.compareTo
in interface Comparable<Byte>
anotherByte
- the Byte
to be compared.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).public static int compare(byte x, byte y)
byte
values numerically.
The value returned is identical to what would be returned by:
Byte.valueOf(x).compareTo(Byte.valueOf(y))
x
- the first byte
to comparey
- the second byte
to compare0
if x == y
;
a value less than 0
if x < y
; and
a value greater than 0
if x > y
public static int toUnsignedInt(byte x)
int
by an unsigned
conversion. In an unsigned conversion to an int
, the
high-order 24 bits of the int
are zero and the
low-order 8 bits are equal to the bits of the byte
argument.
Consequently, zero and positive byte
values are mapped
to a numerically equal int
value and negative byte
values are mapped to an int
value equal to the
input plus 28.x
- the value to convert to an unsigned int
int
by an unsigned
conversionpublic static long toUnsignedLong(byte x)
long
by an unsigned
conversion. In an unsigned conversion to a long
, the
high-order 56 bits of the long
are zero and the
low-order 8 bits are equal to the bits of the byte
argument.
Consequently, zero and positive byte
values are mapped
to a numerically equal long
value and negative byte
values are mapped to a long
value equal to the
input plus 28.x
- the value to convert to an unsigned long
long
by an unsigned
conversion Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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