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 | BYTESThe number of bytes used to represent a  bytevalue in two's
 complement binary form. | 
| static byte | MAX_VALUEA constant holding the maximum value a  bytecan
 have, 27-1. | 
| static byte | MIN_VALUEA constant holding the minimum value a  bytecan
 have, -27. | 
| static int | SIZEThe number of bits used to represent a  bytevalue in two's
 complement binary form. | 
| static Class<Byte> | TYPEThe  Classinstance representing the primitive typebyte. | 
| Constructor and Description | 
|---|
| Byte(byte value)Constructs a newly allocated  Byteobject that
 represents the specifiedbytevalue. | 
| Byte(String s)Constructs a newly allocated  Byteobject that
 represents thebytevalue indicated by theStringparameter. | 
| Modifier and Type | Method and Description | 
|---|---|
| byte | byteValue()Returns the value of this  Byteas abyte. | 
| static int | compare(byte x,
       byte y)Compares two  bytevalues numerically. | 
| int | compareTo(Byte anotherByte)Compares two  Byteobjects numerically. | 
| static Byte | decode(String nm)Decodes a  Stringinto aByte. | 
| double | doubleValue()Returns the value of this  Byteas adoubleafter a widening primitive conversion. | 
| boolean | equals(Object obj)Compares this object to the specified object. | 
| float | floatValue()Returns the value of this  Byteas afloatafter
 a widening primitive conversion. | 
| int | hashCode()Returns a hash code for this  Byte; equal to the result
 of invokingintValue(). | 
| static int | hashCode(byte value)Returns a hash code for a  bytevalue; compatible withByte.hashCode(). | 
| int | intValue()Returns the value of this  Byteas anintafter
 a widening primitive conversion. | 
| long | longValue()Returns the value of this  Byteas alongafter
 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  bytein the
 radix specified by the second argument. | 
| short | shortValue()Returns the value of this  Byteas ashortafter
 a widening primitive conversion. | 
| String | toString()Returns a  Stringobject representing thisByte's value. | 
| static String | toString(byte b)Returns a new  Stringobject representing the
 specifiedbyte. | 
| static int | toUnsignedInt(byte x)Converts the argument to an  intby an unsigned
 conversion. | 
| static long | toUnsignedLong(byte x)Converts the argument to a  longby an unsigned
 conversion. | 
| static Byte | valueOf(byte b)Returns a  Byteinstance representing the specifiedbytevalue. | 
| static Byte | valueOf(String s)Returns a  Byteobject holding the value
 given by the specifiedString. | 
| static Byte | valueOf(String s,
       int radix)Returns a  Byteobject holding the value
 extracted from the specifiedStringwhen 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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