java.lang.Object
java.lang.Number
java.lang.Byte
public final class Byte
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.
Number, Serialized Form
static byte MAX_VALUE
byte can have, 27-1. static byte MIN_VALUE
byte can have, -27. static int SIZE
static Class<Byte> TYPE
Class instance representing the primitive type byte. Constructor Summary Byte(byte value)
Byte object that represents the specified byte value. Byte(String s)
Byte object that represents the byte value indicated by the String parameter. Method Summary byte byteValue()
Byte as a byte. int compareTo(Byte anotherByte)
Byte objects numerically. static Byte decode(String nm)
String into a Byte. double doubleValue()
Byte as a double. boolean equals(Object obj)
float floatValue()
Byte as a float. int hashCode()
Byte. int intValue()
Byte as an int. long longValue()
Byte as a long. static byte parseByte(String s)
byte. static byte parseByte(String s, int radix)
byte in the radix specified by the second argument. short shortValue()
Byte as a short. String toString()
String object representing this Byte's value. static String toString(byte b)
String object representing the specified byte. static Byte valueOf(byte b)
static Byte valueOf(String s)
Byte object holding the value given by the specified String. static Byte valueOf(String s, int radix)
Byte object holding the value extracted from the specified String when parsed with the radix given by the second argument. MIN_VALUE
public static final byte MIN_VALUE
byte can have, -27.
public static final byte MAX_VALUE
byte can have, 27-1.
public static final Class<Byte> TYPE
Class instance representing the primitive type byte.
public static final int SIZE
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 converted
byte
Integer.toString(int)
public static Byte valueOf(byte b)
Byte(byte), as this method is likely to yield significantly better space and time performance by caching frequently requested values.
b - a byte value.
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. 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 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. 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') 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 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 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 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 parsed
Byte object holding the value represented by the string argument
NumberFormatException - 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 defined in §3.10.1 of the Java Language Specification.
- DecodableString:
- Signopt DecimalNumeral
- Signopt
0xHexDigits- Signopt
0XHexDigits- Signopt
#HexDigits- Signopt
0OctalDigits- Sign:
-
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.
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.
byteValue in class Number
byte.
public short shortValue()
Byte as a short.
shortValue in class Number
short.
public int intValue()
Byte as an int.
intValue in class Number
int.
public long longValue()
Byte as a long.
longValue in class Number
long.
public float floatValue()
Byte as a float.
floatValue in class Number
float.
public double doubleValue()
Byte as a double.
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.
toString in class Object
public int hashCode()
Byte.
hashCode in class Object
Object.equals(java.lang.Object), Hashtable
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 with
true if the objects are the same; false otherwise.
Object.hashCode(), Hashtable
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).
Copyright © 2004, 2010 Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
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