Byte

java.lang.Object
- java.lang.Number
- - java.lang.Byte

所有已实现的接口:

Serializable, Comparable<Byte>
```
public final class Byte
extends Number
implements Comparable<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.

从以下版本开始:

JDK1.1

另请参阅:

Number, 序列化表格

字段概要

字段
限定符和类型	字段	说明
`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`.

构造器概要

构造器
构造器	说明
`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.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`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.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - BYTES
```
public static final int BYTES
```
    The number of bytes used to represent a byte value in two's complement binary form.
    
    从以下版本开始:
    
    1.8
    
    另请参阅:
    
    常量字段值
  - MAX_VALUE
```
public static final byte MAX_VALUE
```
    A constant holding the maximum value a byte can have, 2⁷-1.
    
    另请参阅:
    
    常量字段值
  - MIN_VALUE
```
public static final byte MIN_VALUE
```
    A constant holding the minimum value a byte can have, -2⁷.
    
    另请参阅:
    
    常量字段值
  - SIZE
```
public static final int SIZE
```
    The number of bits used to represent a byte value in two's complement binary form.
    
    从以下版本开始:
    
    1.5
    
    另请参阅:
    
    常量字段值
  - TYPE
```
public static final Class<Byte> TYPE
```
    The Class instance representing the primitive type byte.
- 构造器详细资料
  - Byte
```
public Byte(byte value)
```
    Constructs a newly allocated Byte object that represents the specified byte value.
    
    参数:
    
    value - the value to be represented by the Byte.
  - 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.
    
    参数:
    
    s - the String to be converted to a Byte
    
    抛出:
    
    NumberFormatException - If the String does not contain a parsable byte.
    
    另请参阅:
    
    parseByte(java.lang.String, int)
- 方法详细资料
  - toString
```
public static String toString(byte b)
```
    Returns a new String object representing the specified byte. The radix is assumed to be 10.
    
    参数:
    
    b - the byte to be converted
    
    返回:
    
    the string representation of the specified byte
    
    另请参阅:
    
    Integer.toString(int)
  - valueOf
```
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 since all byte values are cached.
    
    参数:
    
    b - a byte value.
    
    返回:
    
    a Byte instance representing b.
    
    从以下版本开始:
    
    1.5
  - parseByte
```
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 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:
    - The first argument is null or is a string of length zero.
    - The radix is either smaller than Character.MIN_RADIX or larger than 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') or plus sign '+' ('\u002B') provided that the string is longer than length 1.
    - The value represented by the string is not a value of type byte.
    参数:
    
    s - the String containing the byte representation to be parsed
    
    radix - the radix to be used while parsing s
    
    返回:
    
    the byte value represented by the string argument in the specified radix
    
    抛出:
    
    NumberFormatException - If the string does not contain a parsable byte.
  - parseByte
```
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 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.
    
    参数:
    
    s - a String containing the byte representation to be parsed
    
    返回:
    
    the byte value represented by the argument in decimal
    
    抛出:
    
    NumberFormatException - if the string does not contain a parsable byte.
  - valueOf
```
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 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))
    
    参数:
    
    s - the string to be parsed
    
    radix - the radix to be used in interpreting s
    
    返回:
    
    a Byte object holding the value represented by the string argument in the specified radix.
    
    抛出:
    
    NumberFormatException - If the String does not contain a parsable byte.
  - valueOf
```
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))
    
    参数:
    
    s - the string to be parsed
    
    返回:
    
    a Byte object holding the value represented by the string argument
    
    抛出:
    
    NumberFormatException - If the String does not contain a parsable byte.
  - decode
```
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:
    Sign_opt DecimalNumeral
    Sign_opt 0x HexDigits
    Sign_opt 0X HexDigits
    Sign_opt # HexDigits
    Sign_opt 0 OctalDigits
    Sign:
    -
    +
    
    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.
    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.
    
    参数:
    
    nm - the String to decode.
    
    返回:
    
    a Byte object holding the byte value represented by nm
    
    抛出:
    
    NumberFormatException - if the String does not contain a parsable byte.
    
    另请参阅:
    
    parseByte(java.lang.String, int)
  - byteValue
```
public byte byteValue()
```
    Returns the value of this Byte as a byte.
    
    覆盖:
    
    byteValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type byte.
  - shortValue
```
public short shortValue()
```
    Returns the value of this Byte as a short after a widening primitive conversion.
    
    覆盖:
    
    shortValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type short.
  - intValue
```
public int intValue()
```
    Returns the value of this Byte as an int after a widening primitive conversion.
    
    指定者:
    
    intValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type int.
  - longValue
```
public long longValue()
```
    Returns the value of this Byte as a long after a widening primitive conversion.
    
    指定者:
    
    longValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type long.
  - floatValue
```
public float floatValue()
```
    Returns the value of this Byte as a float after a widening primitive conversion.
    
    指定者:
    
    floatValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type float.
  - doubleValue
```
public double doubleValue()
```
    Returns the value of this Byte as a double after a widening primitive conversion.
    
    指定者:
    
    doubleValue 在类中 Number
    
    返回:
    
    the numeric value represented by this object after conversion to type double.
  - toString
```
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 toString(byte) method.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a string representation of the value of this object in base 10.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for this Byte; equal to the result of invoking intValue().
    
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    a hash code value for this Byte
    
    另请参阅:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - hashCode
```
public static int hashCode(byte value)
```
    Returns a hash code for a byte value; compatible with Byte.hashCode().
    
    参数:
    
    value - the value to hash
    
    返回:
    
    a hash code value for a byte value.
    
    从以下版本开始:
    
    1.8
  - equals
```
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.
    
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    obj - the object to compare with
    
    返回:
    
    true if the objects are the same; false otherwise.
    
    另请参阅:
    
    Object.hashCode(), HashMap
  - compareTo
```
public int compareTo(Byte anotherByte)
```
    Compares two Byte objects numerically.
    
    指定者:
    
    compareTo 在接口中 Comparable<Byte>
    
    参数:
    
    anotherByte - the Byte to be compared.
    
    返回:
    
    the 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).
    
    从以下版本开始:
    
    1.2
  - compare
```
public static int compare(byte x,
                          byte y)
```
    Compares two byte values numerically. The value returned is identical to what would be returned by:
```
    Byte.valueOf(x).compareTo(Byte.valueOf(y))
 
```
    参数:
    
    x - the first byte to compare
    
    y - the second byte to compare
    
    返回:
    
    the value 0 if x == y; a value less than 0 if x < y; and a value greater than 0 if x > y
    
    从以下版本开始:
    
    1.7
  - toUnsignedInt
```
public static int toUnsignedInt(byte x)
```
    Converts the argument to an 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.
    
    参数:
    
    x - the value to convert to an unsigned int
    
    返回:
    
    the argument converted to int by an unsigned conversion
    
    从以下版本开始:
    
    1.8
  - toUnsignedLong
```
public static long toUnsignedLong(byte x)
```
    Converts the argument to a 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.
    
    参数:
    
    x - the value to convert to an unsigned long
    
    返回:
    
    the argument converted to long by an unsigned conversion
    
    从以下版本开始:
    
    1.8

类 Byte

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

BYTES

MAX_VALUE

MIN_VALUE

SIZE

TYPE

构造器详细资料

Byte

Byte

方法详细资料

toString

valueOf

parseByte

parseByte

valueOf

valueOf

decode

byteValue

shortValue

intValue

longValue

floatValue

doubleValue

toString

hashCode

hashCode

equals

compareTo

compare

toUnsignedInt

toUnsignedLong