Long class

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

static long MAX_VALUE: Maximum value a long can have, 2⁶³-1.
static long MIN_VALUE: Minimum value a long can have, -2⁶³.
static int SIZE: The number of bits used to represent a long value in two's complement binary form.

Constructors from Long

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

Decode a string to create long value

Get the long value from a string

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

Parse long value from string

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

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

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

static int signum(long i): Returns the signum function of the specified long value.

Get the number of zero bits preceding and following

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

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

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.

Long: