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 Form| Modifier 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
ByteNumberFormatException - 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 convertedbyteInteger.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 sbyte 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 sByte 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
0xHexDigits- Signopt
0XHexDigits- Signopt
#HexDigits- Signopt
0OctalDigits- 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 nmNumberFormatException - 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 Numbershort.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 Numberfloat.public double doubleValue()
Byte as a double
after a widening primitive conversion.doubleValue in class Numberdouble.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 ObjectByteObject.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 Objectobj - the object to compare withtrue if the objects are the same;
false otherwise.Object.hashCode(),
HashMappublic 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 > ypublic 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 intint 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 longlong 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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