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.
Number, Serialized Formpublic static final byte MIN_VALUE
A constant holding the minimum value a byte can have, -27.
public static final byte MAX_VALUE
A constant holding the maximum value a byte can have, 27-1.
public static final Class<Byte> TYPE
The Class instance representing the primitive type byte.
public static final int SIZE
The number of bits used to represent a byte value in two's complement binary form.
public static final int BYTES
The number of bytes used to represent a byte value in two's complement binary form.
public Byte(byte value)
Constructs a newly allocated Byte object that represents the specified byte value.
value - the 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.
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)
Returns a new String object representing the specified byte. The radix is assumed to be 10.
b - the byte to be convertedbyte
Integer.toString(int)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.
b - a byte value.Byte instance representing b.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:
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 s
byte 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 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.
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 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))
s - the string to be parsedradix - 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 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))
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 Decodes a String into a Byte. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:
0x HexDigits 0X HexDigits # HexDigits 0 OctalDigits - + 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()
Returns the value of this Byte as a byte.
byteValue in class Number
byte.public short shortValue()
Returns the value of this Byte as a short after a widening primitive conversion.
shortValue in class Number
short.public int intValue()
Returns the value of this Byte as an int after a widening primitive conversion.
intValue in class Number
int.public long longValue()
Returns the value of this Byte as a long after a widening primitive conversion.
longValue in class Number
long.public float floatValue()
Returns the value of this Byte as a float after a widening primitive conversion.
floatValue in class Number
float.public double doubleValue()
Returns the value of this Byte as a double after a widening primitive conversion.
doubleValue in class Number
double.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.
toString in class Object
public int hashCode()
Returns a hash code for this 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)
Returns a hash code for a byte value; compatible with Byte.hashCode().
value - the value to hashbyte value.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.
equals in class Object
obj - the object to compare withtrue if the objects are the same; false otherwise.Object.hashCode(), HashMap
public int compareTo(Byte anotherByte)
Compares two 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) Compares two 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 > y
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.
x - the value to convert to an unsigned int
int by an unsigned conversionpublic 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.
x - the value to convert to an unsigned long
long by an unsigned conversion
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