Client and backend. This class is shared: the same code is compiled into your app and into your server, so everything on this page works in both.

public final class Long

  1. Object
  2. Number
  3. Long

ImplementsComparable<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. Since: JDK1.0, CLDC 1.0

Fields

public static Class<Long> TYPE
public static final long MAX_VALUE = 9223372036854775807LThe largest value of type long.
public static final long MIN_VALUE = -9223372036854775808LThe smallest value of type long.
public static final int BYTES = 8The size of a long in bytes.
public static final int SIZE = 64The size of a long in bits.

Constructors

public Long(long value)Constructs a newly allocated Long object that represents the primitive long argument.
public Long(String s) throws NumberFormatExceptionDeprecated A Long of parseLong(s).

Methods

public double doubleValue()Returns the value of this Long as a double.
public boolean equals(Object obj)Compares this object against the specified object.
public float floatValue()Returns the value of this Long as a float.
public int hashCode()Computes a hashcode for this Long.
public long longValue()Returns the value of this Long as a long value.
public int intValue()Returns the value of this Long as an int value.
public byte byteValue()Returns the value of this Long as a byte value.
public static long parseLong(String s) throws NumberFormatExceptionParses the string argument as a signed decimal long.
public static long parseLong(String s, int radix) throws NumberFormatExceptionParses the string argument as a signed long in the radix specified by the second argument.
public String toString()Returns a String object representing this Long’s value.
public static String toString(long i)Returns a new String object representing the specified integer.
public static String toString(long i, int radix)Creates a string representation of the first argument in the radix specified by the second argument.
public static Long valueOf(long i)Returns the object instance of i
public static int compare(long l1, long l2)
public int compareTo(Long l)Compares this object to the specified object to determine their relative order.
public static int hashCode(long value)
public static long sum(long a, long b)
public static long max(long a, long b)
public static long min(long a, long b)
public static Long valueOf(String s) throws NumberFormatExceptionA Long of parseLong(s).
public static Long valueOf(String s, int radix) throws NumberFormatExceptionA Long of parseLong(s, radix).
public static int bitCount(long i)The number of one bits.
public static long highestOneBit(long i)The highest one bit alone, or 0.
public static long lowestOneBit(long i)The lowest one bit alone, or 0.
public static int numberOfLeadingZeros(long i)The number of zero bits above the highest one bit; 64 for zero.
public static int numberOfTrailingZeros(long i)The number of zero bits below the lowest one bit; 64 for zero.
public static long reverse(long i)The bits in reverse order.
public static long reverseBytes(long i)The bytes in reverse order.
public static long rotateLeft(long i, int distance)The bits rotated left by distance.
public static long rotateRight(long i, int distance)The bits rotated right by distance.
public static int signum(long i)-1, 0 or 1 by the sign of i.
public static String toHexString(long i)The value as unsigned hexadecimal digits.
public static String toOctalString(long i)The value as unsigned octal digits.
public static String toBinaryString(long i)The value as unsigned binary digits.
public static int compareUnsigned(long x, long y)Compares the two as unsigned values.
public static long divideUnsigned(long dividend, long divisor)The unsigned quotient.
public static long remainderUnsigned(long dividend, long divisor)The unsigned remainder.
public static String toUnsignedString(long i)The value as an unsigned decimal string.
public static String toUnsignedString(long i, int radix)The value as an unsigned string in radix.
public static long parseUnsignedLong(String s) throws NumberFormatExceptionParses an unsigned decimal long.
public static long parseUnsignedLong(String s, int radix) throws NumberFormatExceptionParses an unsigned long in radix.
public static long parseLong(CharSequence s, int beginIndex, int endIndex, int radix) throws NumberFormatExceptionParses s from beginIndex to endIndex as a signed long.
public static long parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix) throws NumberFormatExceptionParses s from beginIndex to endIndex as an unsigned long.
public static Long decode(String nm) throws NumberFormatExceptionDecodes a decimal, 0x, 0X, # or leading-zero octal long, with an optional sign.
public static Long getLong(String nm)The system property nm as a Long, or null.
public static Long getLong(String nm, long val)The system property nm as a Long, or val.
public static Long getLong(String nm, Long val)The system property nm decoded as a Long, or val when it is unset or not a number.
public static long compress(long i, long mask)The bits of i selected by mask, packed to the low end.
public static long expand(long i, long mask)The low bits of i spread to the positions of the one bits of mask.

Inherited methods

Field details

TYPE

public static Class<Long> TYPE

MAX_VALUE

public static final long MAX_VALUE = 9223372036854775807L
The largest value of type long. See Also:Constant Field Values

MIN_VALUE

public static final long MIN_VALUE = -9223372036854775808L
The smallest value of type long. See Also:Constant Field Values

BYTES

public static final int BYTES = 8
The size of a long in bytes.

SIZE

public static final int SIZE = 64
The size of a long in bits.

Constructor details

Long

public Long(long value)
Constructs a newly allocated Long object that represents the primitive long argument. value - the value to be represented by the Long object.

Long

public Long(String s) throws NumberFormatException
Deprecated.
A Long of parseLong(s).

Method details

doubleValue

public double doubleValue()
Returns the value of this Long as a double.

equals

public boolean equals(Object obj)
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.

floatValue

public float floatValue()
Returns the value of this Long as a float.

hashCode

public int hashCode()
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))

longValue

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

intValue

public int intValue()
Returns the value of this Long as an int value.

byteValue

public byte byteValue()
Returns the value of this Long as a byte value.

parseLong

public static long parseLong(String s) throws NumberFormatException
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 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.

parseLong

public static long parseLong(String s, int radix) throws NumberFormatException
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

toString

public String toString()
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 method that takes one argument.

toString

public static String toString(long i)
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 method that takes two arguments.

toString

public static String toString(long i, int radix)
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: 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.

valueOf

public static Long valueOf(long i)
Returns the object instance of i

Parameters

i long
the primitive

Returns

object instance

compare

public static int compare(long l1, long l2)

compareTo

public int compareTo(Long l)
Compares this object to the specified object to determine their relative order.

Parameters

l Long
the object to compare to this instance.

Returns

a negative integer if this instance is less than another; a positive integer if this instance is greater than another; 0 if this instance has the same order as another.

Throws

ClassCastException
if another cannot be converted into something comparable to this instance.

hashCode

public static int hashCode(long value)

sum

public static long sum(long a, long b)

max

public static long max(long a, long b)

min

public static long min(long a, long b)

valueOf

public static Long valueOf(String s) throws NumberFormatException
A Long of parseLong(s).

valueOf

public static Long valueOf(String s, int radix) throws NumberFormatException
A Long of parseLong(s, radix).

bitCount

public static int bitCount(long i)
The number of one bits.

highestOneBit

public static long highestOneBit(long i)
The highest one bit alone, or 0.

lowestOneBit

public static long lowestOneBit(long i)
The lowest one bit alone, or 0.

numberOfLeadingZeros

public static int numberOfLeadingZeros(long i)
The number of zero bits above the highest one bit; 64 for zero.

numberOfTrailingZeros

public static int numberOfTrailingZeros(long i)
The number of zero bits below the lowest one bit; 64 for zero.

reverse

public static long reverse(long i)
The bits in reverse order.

reverseBytes

public static long reverseBytes(long i)
The bytes in reverse order.

rotateLeft

public static long rotateLeft(long i, int distance)
The bits rotated left by distance.

rotateRight

public static long rotateRight(long i, int distance)
The bits rotated right by distance.

signum

public static int signum(long i)
-1, 0 or 1 by the sign of i.

toHexString

public static String toHexString(long i)
The value as unsigned hexadecimal digits.

toOctalString

public static String toOctalString(long i)
The value as unsigned octal digits.

toBinaryString

public static String toBinaryString(long i)
The value as unsigned binary digits.

compareUnsigned

public static int compareUnsigned(long x, long y)
Compares the two as unsigned values.

divideUnsigned

public static long divideUnsigned(long dividend, long divisor)
The unsigned quotient.

remainderUnsigned

public static long remainderUnsigned(long dividend, long divisor)
The unsigned remainder.

toUnsignedString

public static String toUnsignedString(long i)
The value as an unsigned decimal string.

toUnsignedString

public static String toUnsignedString(long i, int radix)
The value as an unsigned string in radix.

parseUnsignedLong

public static long parseUnsignedLong(String s) throws NumberFormatException
Parses an unsigned decimal long.

parseUnsignedLong

public static long parseUnsignedLong(String s, int radix) throws NumberFormatException
Parses an unsigned long in radix.

parseLong

public static long parseLong(CharSequence s, int beginIndex, int endIndex, int radix) throws NumberFormatException
Parses s from beginIndex to endIndex as a signed long.

parseUnsignedLong

public static long parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix) throws NumberFormatException
Parses s from beginIndex to endIndex as an unsigned long.

decode

public static Long decode(String nm) throws NumberFormatException
Decodes a decimal, 0x, 0X, # or leading-zero octal long, with an optional sign.

getLong

public static Long getLong(String nm)
The system property nm as a Long, or null.

getLong

public static Long getLong(String nm, long val)
The system property nm as a Long, or val.

getLong

public static Long getLong(String nm, Long val)
The system property nm decoded as a Long, or val when it is unset or not a number.

compress

public static long compress(long i, long mask)
The bits of i selected by mask, packed to the low end.

expand

public static long expand(long i, long mask)
The low bits of i spread to the positions of the one bits of mask.