public final class java.lang
Byte


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Java SE 6
  
Extends: Number
Implements: Comparable

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.
version1.41, 11/17/05
sinceJDK1.1
See also java.lang.Number


Fields
final public static byte MIN_VALUE
A constant holding the minimum value a byte can have, -27.
final public static byte MAX_VALUE
A constant holding the maximum value a byte can have, 27-1.
final public static Class TYPE
The Class instance representing the primitive type byte.
final public static int SIZE
The number of bits used to represent a byte value in two's complement binary form.
since1.5

Constructors
public Byte(byte value)
Constructs a newly allocated Byte object that represents the specified byte value.
valuethe value to be represented by the Byte.
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.
sthe String to be converted to a Byte
ThrowsNumberFormatException: If the String does not contain a parsable byte.
See also parseByte(java.lang.String, int)

Methods
public byte byteValue()
Returns the value of this Byte as a byte.
public int compareTo(Byte anotherByte)
Compares two Byte objects numerically.
anotherBytethe Byte to be compared.
returnthe 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).
since1.2
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.
nmthe String to decode.
returna Byte object holding the byte value represented by nm
ThrowsNumberFormatException: if the String does not contain a parsable byte.
See also parseByte(java.lang.String, int)

public double doubleValue()
Returns the value of this Byte as a double.
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.
objthe object to compare with
returntrue if the objects are the same; false otherwise.
public float floatValue()
Returns the value of this Byte as a float.
public int hashCode()
Returns a hash code for this Byte.
public int intValue()
Returns the value of this Byte as an int.
public long longValue()
Returns the value of this Byte as a long.
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 int) method.
sa String containing the byte representation to be parsed
returnthe byte value represented by the argument in decimal
ThrowsNumberFormatException: if the string does not contain a parsable byte.
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 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 java.lang.Character#MIN_RADIX or larger than java.lang.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.
sthe String containing the byte representation to be parsed
radixthe radix to be used while parsing s
returnthe byte value represented by the string argument in the specified radix
ThrowsNumberFormatException: If the string does not contain a parsable byte.
public short shortValue()
Returns the value of this Byte as a short.
public static String toString(byte b)
Returns a new String object representing the specified byte. The radix is assumed to be 10.
bthe byte to be converted
returnthe string representation of the specified byte
See also toString(int)
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 java.lang.Byte#toString(byte) method.
returna string representation of the value of this object in base 10.
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), as this method is likely to yield significantly better space and time performance by caching frequently requested values.
ba byte value.
returna Byte instance representing b.
since1.5
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 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))
sthe string to be parsed
radixthe radix to be used in interpreting s
returna Byte object holding the value represented by the string argument in the specified radix.
ThrowsNumberFormatException: If the String does not contain a parsable byte.
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 #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))
sthe string to be parsed
returna Byte object holding the value represented by the string argument
ThrowsNumberFormatException: If the String does not contain a parsable byte.
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Java SE 6
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