Long
public
final
class
Long
extends Number
implements
Comparable<Long>
java.lang.Object  
↳  java.lang.Number  
↳  java.lang.Long 
The Long
class wraps a value of the primitive type long
in an object. An object of type Long
contains a
single field whose type is long
.
In addition, this class provides several methods for converting
a long
to a String
and a String
to a long
, as well as other constants and methods useful when dealing
with a long
.
Implementation note: The implementations of the "bit twiddling"
methods (such as highestOneBit
and
numberOfTrailingZeros
) are
based on material from Henry S. Warren, Jr.'s Hacker's
Delight, (Addison Wesley, 2002).
Summary
Constants  

int 
BYTES
The number of bytes used to represent a 
long 
MAX_VALUE
A constant holding the maximum value a 
long 
MIN_VALUE
A constant holding the minimum value a 
int 
SIZE
The number of bits used to represent a 
Fields  

public
static
final
Class<Long> 
TYPE
The 
Public constructors  

Long(long value)
Constructs a newly allocated 

Long(String s)
Constructs a newly allocated 
Public methods  

static
int

bitCount(long i)
Returns the number of onebits in the two's complement binary
representation of the specified 
byte

byteValue()
Returns the value of this 
static
int

compare(long x, long y)
Compares two 
int

compareTo(Long anotherLong)
Compares two 
static
int

compareUnsigned(long x, long y)
Compares two 
static
Long

decode(String nm)
Decodes a 
static
long

divideUnsigned(long dividend, long divisor)
Returns the unsigned quotient of dividing the first argument by the second where each argument and the result is interpreted as an unsigned value. 
double

doubleValue()
Returns the value of this 
boolean

equals(Object obj)
Compares this object to the specified object. 
float

floatValue()
Returns the value of this 
static
Long

getLong(String nm, Long val)
Returns the 
static
Long

getLong(String nm)
Determines the 
static
Long

getLong(String nm, long val)
Determines the 
int

hashCode()
Returns a hash code for this 
static
int

hashCode(long value)
Returns a hash code for a 
static
long

highestOneBit(long i)
Returns a 
int

intValue()
Returns the value of this 
long

longValue()
Returns the value of this 
static
long

lowestOneBit(long i)
Returns a 
static
long

max(long a, long b)
Returns the greater of two 
static
long

min(long a, long b)
Returns the smaller of two 
static
int

numberOfLeadingZeros(long i)
Returns the number of zero bits preceding the highestorder
("leftmost") onebit in the two's complement binary representation
of the specified 
static
int

numberOfTrailingZeros(long i)
Returns the number of zero bits following the lowestorder ("rightmost")
onebit in the two's complement binary representation of the specified

static
long

parseLong(String s)
Parses the string argument as a signed decimal 
static
long

parseLong(String s, int radix)
Parses the string argument as a signed 
static
long

parseUnsignedLong(String s)
Parses the string argument as an unsigned decimal 
static
long

parseUnsignedLong(String s, int radix)
Parses the string argument as an unsigned 
static
long

remainderUnsigned(long dividend, long divisor)
Returns the unsigned remainder from dividing the first argument by the second where each argument and the result is interpreted as an unsigned value. 
static
long

reverse(long i)
Returns the value obtained by reversing the order of the bits in the
two's complement binary representation of the specified 
static
long

reverseBytes(long i)
Returns the value obtained by reversing the order of the bytes in the
two's complement representation of the specified 
static
long

rotateLeft(long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified 
static
long

rotateRight(long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified 
short

shortValue()
Returns the value of this 
static
int

signum(long i)
Returns the signum function of the specified 
static
long

sum(long a, long b)
Adds two 
static
String

toBinaryString(long i)
Returns a string representation of the 
static
String

toHexString(long i)
Returns a string representation of the 
static
String

toOctalString(long i)
Returns a string representation of the 
static
String

toString(long i, int radix)
Returns a string representation of the first argument in the radix specified by the second argument. 
String

toString()
Returns a 
static
String

toString(long i)
Returns a 
static
String

toUnsignedString(long i)
Returns a string representation of the argument as an unsigned decimal value. 
static
String

toUnsignedString(long i, int radix)
Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument. 
static
Long

valueOf(String s)
Returns a 
static
Long

valueOf(String s, int radix)
Returns a 
static
Long

valueOf(long l)
Returns a 
Inherited methods  

Constants
BYTES
public static final int BYTES
The number of bytes used to represent a long
value in two's
complement binary form.
Constant Value: 8 (0x00000008)
MAX_VALUE
public static final long MAX_VALUE
A constant holding the maximum value a long
can
have, 2^{63}1.
Constant Value: 9223372036854775807 (0x7fffffffffffffff)
MIN_VALUE
public static final long MIN_VALUE
A constant holding the minimum value a long
can
have, 2^{63}.
Constant Value: 9223372036854775808 (0x8000000000000000)
SIZE
public static final int SIZE
The number of bits used to represent a long
value in two's
complement binary form.
Constant Value: 64 (0x00000040)
Fields
TYPE
public static final Class<Long> TYPE
The Class
instance representing the primitive type
long
.
Public constructors
Long
public Long (long value)
Constructs a newly allocated Long
object that
represents the specified long
argument.
Parameters  

value 
long : the value to be represented by the
Long object.

Long
public Long (String s)
Constructs a newly allocated Long
object that
represents the long
value indicated by the
String
parameter. The string is converted to a
long
value in exactly the manner used by the
parseLong
method for radix 10.
Parameters  

s 
String : the String to be converted to a
Long . 
Throws  

NumberFormatException 
if the String does not
contain a parsable long . 
See also:
Public methods
bitCount
public static int bitCount (long i)
Returns the number of onebits in the two's complement binary
representation of the specified long
value. This function is
sometimes referred to as the population count.
Parameters  

i 
long : the value whose bits are to be counted 
Returns  

int 
the number of onebits in the two's complement binary
representation of the specified long value. 
byteValue
public byte byteValue ()
Returns the value of this Long
as a byte
after
a narrowing primitive conversion.
Returns  

byte 
the numeric value represented by this object after conversion
to type byte . 
compare
public static int compare (long x, long y)
Compares two long
values numerically.
The value returned is identical to what would be returned by:
Long.valueOf(x).compareTo(Long.valueOf(y))
Parameters  

x 
long : the first long to compare 
y 
long : the second long to compare 
Returns  

int 
the value 0 if x == y ;
a value less than 0 if x < y ; and
a value greater than 0 if x > y 
compareTo
public int compareTo (Long anotherLong)
Compares two Long
objects numerically.
Parameters  

anotherLong 
Long : the Long to be compared. 
Returns  

int 
the value 0 if this Long is
equal to the argument Long ; a value less than
0 if this Long is numerically less
than the argument Long ; and a value greater
than 0 if this Long is numerically
greater than the argument Long (signed
comparison). 
compareUnsigned
public static int compareUnsigned (long x, long y)
Compares two long
values numerically treating the values
as unsigned.
Parameters  

x 
long : the first long to compare 
y 
long : the second long to compare 
Returns  

int 
the value 0 if x == y ; a value less
than 0 if x < y as unsigned values; and
a value greater than 0 if x > y as
unsigned values 
decode
public static Long decode (String nm)
Decodes a String
into a Long
.
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:
 Sign_{opt} DecimalNumeral
 Sign_{opt}
0x
HexDigits Sign_{opt}
0X
HexDigits Sign_{opt}
#
HexDigits Sign_{opt}
0
OctalDigits Sign:

+
The sequence of characters following an optional
sign and/or radix specifier ("0x
", "0X
",
"#
", or leading zero) is parsed as by the Long.parseLong
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
.
Parameters  

nm 
String : the String to decode. 
Returns  

Long 
a Long object holding the long
value represented by nm 
Throws  

NumberFormatException 
if the String does not
contain a parsable long . 
See also:
divideUnsigned
public static long divideUnsigned (long dividend, long divisor)
Returns the unsigned quotient of dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.
Note that in two's complement arithmetic, the three other
basic arithmetic operations of add, subtract, and multiply are
bitwise identical if the two operands are regarded as both
being signed or both being unsigned. Therefore separate addUnsigned
, etc. methods are not provided.
Parameters  

dividend 
long : the value to be divided 
divisor 
long : the value doing the dividing 
Returns  

long 
the unsigned quotient of the first argument divided by the second argument 
See also:
doubleValue
public double doubleValue ()
Returns the value of this Long
as a double
after a widening primitive conversion.
Returns  

double 
the numeric value represented by this object after conversion
to type double .

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 Long
object that
contains the same long
value as this object.
Parameters  

obj 
Object : the object to compare with. 
Returns  

boolean 
true if the objects are the same;
false otherwise.

floatValue
public float floatValue ()
Returns the value of this Long
as a float
after
a widening primitive conversion.
Returns  

float 
the numeric value represented by this object after conversion
to type float .

getLong
public static Long getLong (String nm, Long val)
Returns the long
value of the system property with
the specified name. The first argument is treated as the name
of a system property. System properties are accessible through
the System.getProperty(java.lang.String)
method. The string value of this property is then interpreted
as a long
value, as per the
decode
method, and a Long
object
representing this value is returned; in summary:
 If the property value begins with the two ASCII characters
0x
or the ASCII character#
, not followed by a minus sign, then the rest of it is parsed as a hexadecimal integer exactly as for the methodvalueOf(java.lang.String, int)
with radix 16.  If the property value begins with the ASCII character
0
followed by another character, it is parsed as an octal integer exactly as by the methodvalueOf(java.lang.String, int)
with radix 8.  Otherwise the property value is parsed as a decimal
integer exactly as by the method
valueOf(java.lang.String, int)
with radix 10.
Note that, in every case, neither L
('\u004C'
) nor l
('\u006C'
) is permitted to appear at the end
of the property value as a type indicator, as would be
permitted in Java programming language source code.
The second argument is the default value. The default value is
returned if there is no property of the specified name, if the
property does not have the correct numeric format, or if the
specified name is empty or null
.
Parameters  

nm 
String : property name. 
val 
Long : default value. 
Returns  

Long 
the Long value of the property. 
Throws  

SecurityException 
for the same reasons as
System.getProperty 
getLong
public static Long getLong (String nm)
Determines the long
value of the system property
with the specified name.
The first argument is treated as the name of a system
property. System properties are accessible through the System.getProperty(java.lang.String)
method. The
string value of this property is then interpreted as a long
value using the grammar supported by decode
and a Long
object representing this value is returned.
If there is no property with the specified name, if the
specified name is empty or null
, or if the property
does not have the correct numeric format, then null
is
returned.
In other words, this method returns a Long
object
equal to the value of:
getLong(nm, null)
Parameters  

nm 
String : property name. 
Returns  

Long 
the Long value of the property. 
Throws  

SecurityException 
for the same reasons as
System.getProperty 
getLong
public static Long getLong (String nm, long val)
Determines the long
value of the system property
with the specified name.
The first argument is treated as the name of a system
property. System properties are accessible through the System.getProperty(java.lang.String)
method. The
string value of this property is then interpreted as a long
value using the grammar supported by decode
and a Long
object representing this value is returned.
The second argument is the default value. A Long
object
that represents the value of the second argument is returned if there
is no property of the specified name, if the property does not have
the correct numeric format, or if the specified name is empty or null.
In other words, this method returns a Long
object equal
to the value of:
getLong(nm, new Long(val))
but in practice it may be implemented in a manner such as:
to avoid the unnecessary allocation of aLong result = getLong(nm, null); return (result == null) ? new Long(val) : result;
Long
object when
the default value is not needed.
Parameters  

nm 
String : property name. 
val 
long : default value. 
Returns  

Long 
the Long value of the property. 
Throws  

SecurityException 
for the same reasons as
System.getProperty 
hashCode
public int hashCode ()
Returns a hash code for this Long
. The result is
the exclusive OR of the two halves of the primitive
long
value held by this Long
object. That is, the hashcode is the value of the expression:
(int)(this.longValue()^(this.longValue()>>>32))
Returns  

int 
a hash code value for this object. 
hashCode
public static int hashCode (long value)
Returns a hash code for a long
value; compatible with
Long.hashCode()
.
Parameters  

value 
long : the value to hash 
Returns  

int 
a hash code value for a long value. 
highestOneBit
public static long highestOneBit (long i)
Returns a long
value with at most a single onebit, in the
position of the highestorder ("leftmost") onebit in the specified
long
value. Returns zero if the specified value has no
onebits in its two's complement binary representation, that is, if it
is equal to zero.
Parameters  

i 
long : the value whose highest one bit is to be computed 
Returns  

long 
a long value with a single onebit, in the position
of the highestorder onebit in the specified value, or zero if
the specified value is itself equal to zero. 
intValue
public int intValue ()
Returns the value of this Long
as an int
after
a narrowing primitive conversion.
Returns  

int 
the numeric value represented by this object after conversion
to type int .

longValue
public long longValue ()
Returns the value of this Long
as a
long
value.
Returns  

long 
the numeric value represented by this object after conversion
to type long .

lowestOneBit
public static long lowestOneBit (long i)
Returns a long
value with at most a single onebit, in the
position of the lowestorder ("rightmost") onebit in the specified
long
value. Returns zero if the specified value has no
onebits in its two's complement binary representation, that is, if it
is equal to zero.
Parameters  

i 
long : the value whose lowest one bit is to be computed 
Returns  

long 
a long value with a single onebit, in the position
of the lowestorder onebit in the specified value, or zero if
the specified value is itself equal to zero. 
max
public static long max (long a, long b)
Returns the greater of two long
values
as if by calling Math.max
.
Parameters  

a 
long : the first operand 
b 
long : the second operand 
Returns  

long 
the greater of a and b 
See also:
min
public static long min (long a, long b)
Returns the smaller of two long
values
as if by calling Math.min
.
Parameters  

a 
long : the first operand 
b 
long : the second operand 
Returns  

long 
the smaller of a and b 
See also:
numberOfLeadingZeros
public static int numberOfLeadingZeros (long i)
Returns the number of zero bits preceding the highestorder
("leftmost") onebit in the two's complement binary representation
of the specified long
value. Returns 64 if the
specified value has no onebits in its two's complement representation,
in other words if it is equal to zero.
Note that this method is closely related to the logarithm base 2.
For all positive long
values x:
 floor(log_{2}(x)) =
63  numberOfLeadingZeros(x)
 ceil(log_{2}(x)) =
64  numberOfLeadingZeros(x  1)
Parameters  

i 
long : the value whose number of leading zeros is to be computed 
Returns  

int 
the number of zero bits preceding the highestorder
("leftmost") onebit in the two's complement binary representation
of the specified long value, or 64 if the value
is equal to zero. 
numberOfTrailingZeros
public static int numberOfTrailingZeros (long i)
Returns the number of zero bits following the lowestorder ("rightmost")
onebit in the two's complement binary representation of the specified
long
value. Returns 64 if the specified value has no
onebits in its two's complement representation, in other words if it is
equal to zero.
Parameters  

i 
long : the value whose number of trailing zeros is to be computed 
Returns  

int 
the number of zero bits following the lowestorder ("rightmost")
onebit in the two's complement binary representation of the
specified long value, or 64 if the value is equal
to zero. 
parseLong
public static long parseLong (String s)
Parses the string argument as a signed decimal long
.
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 long
value is
returned, exactly as if the argument and the radix 10
were given as arguments to the parseLong(java.lang.String, int)
method.
Note that neither the character L
('\u004C'
) nor l
('\u006C'
) is permitted to appear at the end
of the string as a type indicator, as would be permitted in
Java programming language source code.
Parameters  

s 
String : a String containing the long
representation to be parsed 
Returns  

long 
the long represented by the argument in
decimal. 
Throws  

NumberFormatException 
if the string does not contain a
parsable long .

parseLong
public static long parseLong (String s, int radix)
Parses the string argument as a signed long
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 long
value is returned.
Note that neither the character L
('\u004C'
) nor l
('\u006C'
) is permitted to appear at the end
of the string as a type indicator, as would be permitted in
Java programming language source code  except that either
L
or l
may appear as a digit for a
radix greater than or equal to 22.
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 thanCharacter.MIN_RADIX
or larger thanCharacter.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
long
.
Examples:
parseLong("0", 10) returns 0L parseLong("473", 10) returns 473L parseLong("+42", 10) returns 42L parseLong("0", 10) returns 0L parseLong("FF", 16) returns 255L parseLong("1100110", 2) returns 102L parseLong("99", 8) throws a NumberFormatException parseLong("Hazelnut", 10) throws a NumberFormatException parseLong("Hazelnut", 36) returns 1356099454469L
Parameters  

s 
String : the String containing the
long representation to be parsed. 
radix 
int : the radix to be used while parsing s . 
Returns  

long 
the long represented by the string argument in
the specified radix. 
Throws  

NumberFormatException 
if the string does not contain a
parsable long .

parseUnsignedLong
public static long parseUnsignedLong (String s)
Parses the string argument as an unsigned decimal long
. The
characters in the string must all be decimal digits, except
that the first character may be an an ASCII plus sign '+'
('\u002B'
). The resulting integer value
is returned, exactly as if the argument and the radix 10 were
given as arguments to the parseUnsignedLong(java.lang.String, int)
method.
Parameters  

s 
String : a String containing the unsigned long
representation to be parsed 
Returns  

long 
the unsigned long value represented by the decimal string argument 
Throws  

NumberFormatException 
if the string does not contain a parsable unsigned integer. 
parseUnsignedLong
public static long parseUnsignedLong (String s, int radix)
Parses the string argument as an unsigned long
in the
radix specified by the second argument. An unsigned integer
maps the values usually associated with negative numbers to
positive numbers larger than MAX_VALUE
.
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 plus
sign '+'
('\u002B'
). The resulting
integer 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 thanCharacter.MAX_RADIX
.  Any character of the string is not a digit of the specified
radix, except that the first character may be a plus sign
'+'
('\u002B'
) provided that the string is longer than length 1.  The value represented by the string is larger than the
largest unsigned
long
, 2^{64}1.
Parameters  

s 
String : the String containing the unsigned integer
representation to be parsed 
radix 
int : the radix to be used while parsing s . 
Returns  

long 
the unsigned long represented by the string
argument in the specified radix. 
Throws  

NumberFormatException 
if the String
does not contain a parsable long . 
remainderUnsigned
public static long remainderUnsigned (long dividend, long divisor)
Returns the unsigned remainder from dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.
Parameters  

dividend 
long : the value to be divided 
divisor 
long : the value doing the dividing 
Returns  

long 
the unsigned remainder of the first argument divided by the second argument 
See also:
reverse
public static long reverse (long i)
Returns the value obtained by reversing the order of the bits in the
two's complement binary representation of the specified long
value.
Parameters  

i 
long : the value to be reversed 
Returns  

long 
the value obtained by reversing order of the bits in the
specified long value. 
reverseBytes
public static long reverseBytes (long i)
Returns the value obtained by reversing the order of the bytes in the
two's complement representation of the specified long
value.
Parameters  

i 
long : the value whose bytes are to be reversed 
Returns  

long 
the value obtained by reversing the bytes in the specified
long value. 
rotateLeft
public static long rotateLeft (long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified long
value left by the
specified number of bits. (Bits shifted out of the left hand, or
highorder, side reenter on the right, or loworder.)
Note that left rotation with a negative distance is equivalent to
right rotation: rotateLeft(val, distance) == rotateRight(val,
distance)
. Note also that rotation by any multiple of 64 is a
noop, so all but the last six bits of the rotation distance can be
ignored, even if the distance is negative: rotateLeft(val,
distance) == rotateLeft(val, distance & 0x3F)
.
Parameters  

i 
long : the value whose bits are to be rotated left 
distance 
int : the number of bit positions to rotate left 
Returns  

long 
the value obtained by rotating the two's complement binary
representation of the specified long value left by the
specified number of bits. 
rotateRight
public static long rotateRight (long i, int distance)
Returns the value obtained by rotating the two's complement binary
representation of the specified long
value right by the
specified number of bits. (Bits shifted out of the right hand, or
loworder, side reenter on the left, or highorder.)
Note that right rotation with a negative distance is equivalent to
left rotation: rotateRight(val, distance) == rotateLeft(val,
distance)
. Note also that rotation by any multiple of 64 is a
noop, so all but the last six bits of the rotation distance can be
ignored, even if the distance is negative: rotateRight(val,
distance) == rotateRight(val, distance & 0x3F)
.
Parameters  

i 
long : the value whose bits are to be rotated right 
distance 
int : the number of bit positions to rotate right 
Returns  

long 
the value obtained by rotating the two's complement binary
representation of the specified long value right by the
specified number of bits. 
shortValue
public short shortValue ()
Returns the value of this Long
as a short
after
a narrowing primitive conversion.
Returns  

short 
the numeric value represented by this object after conversion
to type short . 
signum
public static int signum (long i)
Returns the signum function of the specified long
value. (The
return value is 1 if the specified value is negative; 0 if the
specified value is zero; and 1 if the specified value is positive.)
Parameters  

i 
long : the value whose signum is to be computed 
Returns  

int 
the signum function of the specified long value. 
sum
public static long sum (long a, long b)
Adds two long
values together as per the + operator.
Parameters  

a 
long : the first operand 
b 
long : the second operand 
Returns  

long 
the sum of a and b 
See also:
toBinaryString
public static String toBinaryString (long i)
Returns a string representation of the long
argument as an unsigned integer in base 2.
The unsigned long
value is the argument plus
2^{64} if the argument is negative; otherwise, it is
equal to the argument. This value is converted to a string of
ASCII digits in binary (base 2) with no extra leading
0
s.
The value of the argument can be recovered from the returned
string s
by calling Long.parseUnsignedLong(s,
2)
.
If the unsigned magnitude is zero, it is represented by a
single zero character '0'
('\u0030'
);
otherwise, the first character of the representation of the
unsigned magnitude will not be the zero character. The
characters '0'
('\u0030'
) and '1'
('\u0031'
) are used as binary digits.
Parameters  

i 
long : a long to be converted to a string. 
Returns  

String 
the string representation of the unsigned long
value represented by the argument in binary (base 2). 
toHexString
public static String toHexString (long i)
Returns a string representation of the long
argument as an unsigned integer in base 16.
The unsigned long
value is the argument plus
2^{64} if the argument is negative; otherwise, it is
equal to the argument. This value is converted to a string of
ASCII digits in hexadecimal (base 16) with no extra
leading 0
s.
The value of the argument can be recovered from the returned
string s
by calling Long.parseUnsignedLong(s,
16)
.
If the unsigned magnitude is zero, it is represented by a
single zero character '0'
('\u0030'
);
otherwise, the first character of the representation of the
unsigned magnitude will not be the zero character. The
following characters are used as hexadecimal digits:
0123456789abcdef
These are the characters '\u0030'
through
'\u0039'
and '\u0061'
through
'\u0066'
. If uppercase letters are desired,
the String.toUpperCase()
method may be called
on the result:
Long.toHexString(n).toUpperCase()
Parameters  

i 
long : a long to be converted to a string. 
Returns  

String 
the string representation of the unsigned long
value represented by the argument in hexadecimal
(base 16). 
toOctalString
public static String toOctalString (long i)
Returns a string representation of the long
argument as an unsigned integer in base 8.
The unsigned long
value is the argument plus
2^{64} if the argument is negative; otherwise, it is
equal to the argument. This value is converted to a string of
ASCII digits in octal (base 8) with no extra leading
0
s.
The value of the argument can be recovered from the returned
string s
by calling Long.parseUnsignedLong(s,
8)
.
If the unsigned magnitude is zero, it is represented by a
single zero character '0'
('\u0030'
);
otherwise, the first character of the representation of the
unsigned magnitude will not be the zero character. The
following characters are used as octal digits:
01234567
These are the characters '\u0030'
through
'\u0037'
.
Parameters  

i 
long : a long to be converted to a string. 
Returns  

String 
the string representation of the unsigned long
value represented by the argument in octal (base 8). 
toString
public static String toString (long i, int radix)
Returns a string representation of the first argument in the radix specified by the second argument.
If the radix is smaller than Character.MIN_RADIX
or larger than Character.MAX_RADIX
, then the radix
10
is used instead.
If the first argument is negative, the first element of the
result is the ASCII minus sign ''
('\u002d'
). If the first argument is not
negative, no sign character appears in the result.
The remaining characters of the result represent the magnitude
of the first argument. If the magnitude is zero, it is
represented by a single zero character '0'
('\u0030'
); otherwise, the first character of
the representation of the magnitude will not be the zero
character. The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyz
These are '\u0030'
through
'\u0039'
and '\u0061'
through
'\u007a'
. If radix
is
N, then the first N of these characters
are used as radixN digits in the order shown. Thus,
the digits for hexadecimal (radix 16) are
0123456789abcdef
. If uppercase letters are
desired, the String.toUpperCase()
method may
be called on the result:
Long.toString(n, 16).toUpperCase()
Parameters  

i 
long : a long to be converted to a string. 
radix 
int : the radix to use in the string representation. 
Returns  

String 
a string representation of the argument in the specified radix. 
See also:
toString
public String toString ()
Returns a String
object representing this
Long
's value. The value is converted to signed
decimal representation and returned as a string, exactly as if
the long
value were given as an argument to the
toString(long)
method.
Returns  

String 
a string representation of the value of this object in base 10. 
toString
public static String toString (long i)
Returns a String
object representing the specified
long
. The argument is converted to signed decimal
representation and returned as a string, exactly as if the
argument and the radix 10 were given as arguments to the toString(long, int)
method.
Parameters  

i 
long : a long to be converted. 
Returns  

String 
a string representation of the argument in base 10. 
toUnsignedString
public static String toUnsignedString (long i)
Returns a string representation of the argument as an unsigned
decimal value.
The argument is converted to unsigned decimal representation
and returned as a string exactly as if the argument and radix
10 were given as arguments to the toUnsignedString(long, int)
method.
Parameters  

i 
long : an integer to be converted to an unsigned string. 
Returns  

String 
an unsigned string representation of the argument. 
See also:
toUnsignedString
public static String toUnsignedString (long i, int radix)
Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument.
If the radix is smaller than Character.MIN_RADIX
or larger than Character.MAX_RADIX
, then the radix
10
is used instead.
Note that since the first argument is treated as an unsigned value, no leading sign character is printed.
If the magnitude is zero, it is represented by a single zero
character '0'
('\u0030'
); otherwise,
the first character of the representation of the magnitude will
not be the zero character.
The behavior of radixes and the characters used as digits
are the same as toString
.
Parameters  

i 
long : an integer to be converted to an unsigned string. 
radix 
int : the radix to use in the string representation. 
Returns  

String 
an unsigned string representation of the argument in the specified radix. 
See also:
valueOf
public static Long valueOf (String s)
Returns a Long
object holding the value
of the specified String
. The argument is
interpreted as representing a signed decimal long
,
exactly as if the argument were given to the parseLong(java.lang.String)
method. The result is a
Long
object that represents the integer value
specified by the string.
In other words, this method returns a Long
object
equal to the value of:
new Long(Long.parseLong(s))
Parameters  

s 
String : the string to be parsed. 
Returns  

Long 
a Long object holding the value
represented by the string argument. 
Throws  

NumberFormatException 
If the string cannot be parsed
as a long .

valueOf
public static Long valueOf (String s, int radix)
Returns a Long
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
long
in the radix specified by the second
argument, exactly as if the arguments were given to the parseLong(java.lang.String, int)
method. The result is a
Long
object that represents the long
value specified by the string.
In other words, this method returns a Long
object equal
to the value of:
new Long(Long.parseLong(s, radix))
Parameters  

s 
String : the string to be parsed 
radix 
int : the radix to be used in interpreting s 
Returns  

Long 
a Long object holding the value
represented by the string argument in the specified
radix. 
Throws  

NumberFormatException 
If the String does not
contain a parsable long .

valueOf
public static Long valueOf (long l)
Returns a Long
instance representing the specified
long
value.
If a new Long
instance is not required, this method
should generally be used in preference to the constructor
Long(long)
, as this method is likely to yield
significantly better space and time performance by caching
frequently requested values.
Note that unlike the corresponding method in the Integer
class, this method
is not required to cache values within a particular
range.
Parameters  

l 
long : a long value. 
Returns  

Long 
a Long instance representing l . 
Annotations
Interfaces
Classes
 Boolean
 Byte
 Character
 Character.Subset
 Character.UnicodeBlock
 Class
 ClassLoader
 Compiler
 Double
 Enum
 Float
 InheritableThreadLocal
 Integer
 Long
 Math
 Number
 Object
 Package
 Process
 ProcessBuilder
 ProcessBuilder.Redirect
 Runtime
 RuntimePermission
 SecurityManager
 Short
 StackTraceElement
 StrictMath
 String
 StringBuffer
 StringBuilder
 System
 Thread
 ThreadGroup
 ThreadLocal
 Throwable
 Void
Enums
Exceptions
 ArithmeticException
 ArrayIndexOutOfBoundsException
 ArrayStoreException
 ClassCastException
 ClassNotFoundException
 CloneNotSupportedException
 EnumConstantNotPresentException
 Exception
 IllegalAccessException
 IllegalArgumentException
 IllegalMonitorStateException
 IllegalStateException
 IllegalThreadStateException
 IndexOutOfBoundsException
 InstantiationException
 InterruptedException
 NegativeArraySizeException
 NoSuchFieldException
 NoSuchMethodException
 NullPointerException
 NumberFormatException
 ReflectiveOperationException
 RuntimeException
 SecurityException
 StringIndexOutOfBoundsException
 TypeNotPresentException
 UnsupportedOperationException
Errors
 AbstractMethodError
 AssertionError
 BootstrapMethodError
 ClassCircularityError
 ClassFormatError
 Error
 ExceptionInInitializerError
 IllegalAccessError
 IncompatibleClassChangeError
 InstantiationError
 InternalError
 LinkageError
 NoClassDefFoundError
 NoSuchFieldError
 NoSuchMethodError
 OutOfMemoryError
 StackOverflowError
 ThreadDeath
 UnknownError
 UnsatisfiedLinkError
 UnsupportedClassVersionError
 VerifyError
 VirtualMachineError