Long class « Long « Numbers « Development

The Long class wraps a value of long in an object. Long class provides several methods for converting a long to a String and a String to a long.

Constants value from Long class

Type	Field	Summary
static long	MAX_VALUE	Maximum value a long can have, 2^63-1.
static long	MIN_VALUE	Minimum value a long can have, -2^63.
static int	SIZE	The number of bits used to represent a long value in two's complement binary form.
static Class<Long>	TYPE	The Class instance representing the primitive type long.

Constructors from Long

Constructor	Summary
Long(long value)	Creates a Long object from long argument.
Long(String s)	Creates a Long object from the long value indicated by the String parameter.

Convert long value to byte, double, float, int, long, short

Return	Method	Summary
byte	byteValue()	Returns the value of this Long as a byte.
double	doubleValue()	Returns the value of this Long as a double.
float	floatValue()	Returns the value of this Long as a float.
int	intValue()	Returns the value of this Long as an int.
long	longValue()	Returns the value of this Long as a long value.
short	shortValue()	Returns the value of this Long as a short.

Decode a string to create long value

Return	Method	Summary
static Long	decode(String nm)	Decodes a String into a Long.

Get the long value from a string

Return	Method	Summary
static Long	getLong(String nm)	Determines the long value of the system property with the specified name.
static Long	getLong(String nm, long val)	Determines the long value of the system property with the specified name.
static Long	getLong(String nm, Long val)	Returns the long value of the system property with the specified name.

Compare two long values

Return	Method	Summary
int	compareTo(Long anotherLong)	Compares two Long objects numerically.
boolean	equals(Object obj)	Compares this object to the specified object.

Parse long value from string

Return	Method	Summary
static long	parseLong(String s)	Parses the string argument as a signed decimal long.
static long	parseLong(String s, int radix)	Parses the string as a signed long in the radix.
static Long	valueOf(long l)	Returns a Long instance representing the specified long value.
static Long	valueOf(String s)	Returns a Long object holding the value of the specified String.
static Long	valueOf(String s, int radix)	Returns a Long object holding the value extracted from the String with the radix.

Convert long value to binary, hex and octal format strings

Return	Method	Summary
static String	toBinaryString(long i)	Returns a string representation of the long argument as an unsigned integer in base 2.
static String	toHexString(long i)	Returns a string representation of the long argument as an unsigned integer in base 16.
static String	toOctalString(long i)	Returns a string representation of the long argument as an unsigned integer in base 8.

Convert long value to string

Return	Method	Summary
String	toString()	Returns a String object representing this Long's value.
static String	toString(long i)	Returns a String object representing the specified long.
static String	toString(long i, int radix)	Returns a string representation of the first argument in the radix.

Get the sign of the long value

Return	Method	Summary
static int	signum(long i)	Returns the signum function of the specified long value.

Get the number of zero bits preceding and following

Return	Method	Summary
static int	numberOfLeadingZeros(long i)	Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation.
static int	numberOfTrailingZeros(long i)	Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation.

Reverse and rotate a long value

Return	Method	Summary
static long	reverse(long i)	Returns the value obtained by reversing the order of the bits in the two's complement binary representation.
static long	reverseBytes(long i)	Returns the value obtained by reversing the order of the bytes in the two's complement representation.
static long	rotateLeft(long i, int distance)	Returns the value obtained by rotating the two's complement binary representation left by the number of bits.
static long	rotateRight(long i, int distance)	Returns the value obtained by rotating the two's complement binary representation right by the number of bits.

Bit oriented operation on long value

Return	Method	Summary
static int	bitCount(long i)	Returns the number of one-bits in the two's complement binary representation of the specified long value.
static long	highestOneBit(long i)	Returns a long value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit.
static long	lowestOneBit(long i)	Returns a long value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit.