java.lang Long

java.lang
Long

Declaration
public final class Long
java.lang.Object
|
+--java.lang.Long
Description
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.

Fields
static long MAX_VALUE
static long MIN_VALUE
Constructors
Long(long value)
Methods
double doubleValue()
boolean equals(Object obj)
float floatValue()
int hashCode()
long longValue()
static long parseLong(String s)
static long parseLong(String s, int radix)
String toString()
static String toString(long i)
static String toString(long i, int radix)



Methods inherited from class Object
getClass(), notify(), notifyAll(), wait(), wait(), wait()



Fields
MIN_VALUE
Declaration:
public static final long MIN_VALUE
Description:
The smallest value of type long.
MAX_VALUE
Declaration:
public static final long MAX_VALUE
Description:
The largest value of type long.
Constructors
Long(long)
Declaration:
public Long(long value)
Description:
Constructs a newly allocated Long object that represents the primitive long argument.
Parameters:
value - the value to be represented by the Long object.
Methods
toString(long, int)
Declaration:
public static java.lang.String toString(long i, int radix)
Description:
Creates 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:




toString(long)
0123456789abcdefghijklmnopqrstuvwxyz
These are '\u0030' through '\u0039' and '\u0061' through '\u007a'.
If the radix is N, then the first N of these characters are used as radix-N digits in the order shown. Thus, the
digits for hexadecimal (radix 16) are
0123456789abcdef.
Parameters:
i - a long.
radix - the radix.
Returns: a string representation of the argument in the specified radix.
See Also: Character.MAX_RADIX, Character.MIN_RADIX
toString(long)
Declaration:
public static java.lang.String toString(long i)
Description:
Returns a new String object representing the specified integer. 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 that takes two arguments.
Parameters:
i - a long to be converted.
Returns: a string representation of the argument in base 10.
parseLong(String, int)
Declaration:
public static long parseLong(java.lang.String s, int radix)
throws NumberFormatException
Description:
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
returns a nonnegative value), except that the first character may be an ASCII minus sign '-'
('\u002d' to indicate a negative value. The resulting long value is returned.
Note that neither L nor l 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 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 than Character.MIN_RADIX or larger than
Character.MAX_RADIX.
• The first character of the string is not a digit of the specified radix and is not a minus sign '-'
('\u002d').
• The first character of the string is a minus sign and the string is of length 1.
• Any character of the string after the first is not a digit of the specified radix.


• The integer value represented by the string cannot be represented as a value of type long.
Examples:
parseLong(“0”, 10) returns 0L
parseLong(“473”, 10) returns 473L
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 - the String containing the long.
radix - the radix to be used.
Returns: the long represented by the string argument in the specified radix.
Throws:
NumberFormatException - if the string does not contain a parsable integer.
parseLong(String)
Declaration:
public static long parseLong(java.lang.String s)
throws NumberFormatException
Description:
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. The resulting long value is returned, exactly as if the argument and the radix 10 were given
as arguments to the parseLong(String, int) method that takes two arguments.
Note that neither L nor l 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 - a string.
Returns: the long represented by the argument in decimal.
Throws:
NumberFormatException - if the string does not contain a parsable long.
longValue()
Declaration:
public long longValue()
Description:
Returns the value of this Long as a long value.
Returns: the long value represented by this object.
floatValue()
Declaration:
public float floatValue()



doubleValue()
Description:
Returns the value of this Long as a float.
Returns: the long value represented by this object is converted to type float and the result of the
conversion is returned.
Since: CLDC 1.1
doubleValue()
Declaration:
public double doubleValue()
Description:
Returns the value of this Long as a double.
Returns: the long value represented by this object that is converted to type double and the result of the
conversion is returned.
Since: CLDC 1.1
toString()
Declaration:
public java.lang.String toString()
Description:
Returns a String object representing this Long’s value. The long integer value represented by this Long
object 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 that takes one argument.
Overrides: toString in class Object
Returns: a string representation of this object in base 10.
hashCode()
Declaration:
public int hashCode()
Description:
Computes a hashcode for this Long. The result is the exclusive OR of the two halves of the primitive long
value represented by this Long object. That is, the hashcode is the value of the expression:
(int)(this.longValue()^(this.longValue()>>>32))
Overrides: hashCode in class Object
Returns: a hash code value for this object.
equals(Object)
Declaration:
public boolean equals(java.lang.Object obj)
Description:
Compares this object against 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.
Overrides: equals in class Object


Parameters:
obj - the object to compare with.
Returns: true if the objects are the same; false otherwise.