public final class Byte extends Numberimplements 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, 2
7-1.
|
static byte |
MIN_VALUE
A constant holding the minimum value a
byte can have, -2
7.
|
static int |
SIZE
The number of bits used to represent a
byte value in two's complement binary form.
|
static Class |
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
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
Compares two
Byte objects numerically.
|
static Byte |
decode(String
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
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
Parses the string argument as a signed decimal
byte.
|
static byte |
parseByte(String
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
Returns a
Byte object holding the value given by the specified
String.
|
static Byte |
valueOf(String
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, -2
7.
public static final byte MAX_VALUE
byte can have, 2
7-1.
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(Strings) 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 StringtoString(byte b)
String object representing the specified
byte. The radix is assumed to be 10.
b - the
byte to be converted
byte
Integer.toString(int)
public static BytevalueOf(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(Strings, 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 parsed
radix - the radix to be used while parsing
s
byte value represented by the string argument in the specified radix
NumberFormatException - If the string does not contain a parsable
byte.
public static byte parseByte(Strings) 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 parsed
byte value represented by the argument in decimal
NumberFormatException - if the string does not contain a parsable
byte.
public static BytevalueOf(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 parsed
radix - 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 BytevalueOf(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 parsed
Byte object holding the value represented by the string argument
NumberFormatException - If the
String does not contain a parsable
byte.
public static Bytedecode(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
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 StringtoString()
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 hash
byte value.
public boolean equals(Objectobj)
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 with
true if the objects are the same;
false otherwise.
Object.hashCode() ,
HashMap
public int compareTo(ByteanotherByte)
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 compare
y - the second
byte to compare
0 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 2
8.
x - the value to convert to an unsigned
int
int by an unsigned conversion
public 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 2
8.
x - the value to convert to an unsigned
long
long by an unsigned conversion