The Class instance representing the primitive type long.

since

JDK1.1

The number of bits used to represent a long value in two's complement binary form.

since

1.5

Constructs a newly allocated Long object that represents the specified long argument.

value

the value to be represented by the Long object.

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.

s	the String to be converted to a Long.
Throws	NumberFormatException: if the String does not contain a parsable long.
See also	parseLong(java.lang.String, int)

Returns the number of one-bits in the two's complement binary representation of the specified long value. This function is sometimes referred to as the population count.

return	the number of one-bits in the two's complement binary representation of the specified long value.
since	1.5

Compares two Long objects numerically.

anotherLong	the Long to be compared.
return	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).
since	1.2

Decodes a String into a Long. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:

DecodableString:

Sign_opt DecimalNumeral

Sign_opt 0x HexDigits

Sign_opt 0X HexDigits

Sign_opt # HexDigits

Sign_opt 0 OctalDigits

Sign:

-

DecimalNumeral, HexDigits, and OctalDigits are defined in §3.10.1 of the Java Language Specification.

The sequence of characters following an (optional) negative 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.

nm	the String to decode.
return	a Long object holding the long value represented by nm
Throws	NumberFormatException: if the String does not contain a parsable long.
since	1.2
See also	parseLong(String, int)

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.

obj	the object to compare with.
return	true if the objects are the same; false otherwise.

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))
 

return

a hash code value for this object.

Returns a long value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit in the specified long value. Returns zero if the specified value has no one-bits in its two's complement binary representation, that is, if it is equal to zero.

return	a long value with a single one-bit, in the position of the highest-order one-bit in the specified value, or zero if the specified value is itself equal to zero.
since	1.5

Returns a long value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit in the specified long value. Returns zero if the specified value has no one-bits in its two's complement binary representation, that is, if it is equal to zero.

return	a long value with a single one-bit, in the position of the lowest-order one-bit in the specified value, or zero if the specified value is itself equal to zero.
since	1.5

Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified long value. Returns 64 if the specified value has no one-bits 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(log₂(x)) = 63 - numberOfLeadingZeros(x)
• ceil(log₂(x)) = 64 - numberOfLeadingZeros(x - 1)

return	the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified long value, or 64 if the value is equal to zero.
since	1.5

Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified long value. Returns 64 if the specified value has no one-bits in its two's complement representation, in other words if it is equal to zero.

return	the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified long value, or 64 if the value is equal to zero.
since	1.5

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 int) 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 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 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 java.lang.Character#MIN_RADIX or larger than java.lang.Character#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') 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("-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
 

s	the String containing the long representation to be parsed.
radix	the radix to be used while parsing s.
return	the long represented by the string argument in the specified radix.
Throws	NumberFormatException: if the string does not contain a parsable long.

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 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.

s	a String containing the long representation to be parsed
return	the long represented by the argument in decimal.
Throws	NumberFormatException: if the string does not contain a parsable long.

Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified long value.

return	the value obtained by reversing order of the bits in the specified long value.
since	1.5

Returns the value obtained by reversing the order of the bytes in the two's complement representation of the specified long value.

return	the value obtained by reversing the bytes in the specified long value.
since	1.5

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 high-order, side reenter on the right, or low-order.)

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 no-op, 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).

return	the value obtained by rotating the two's complement binary representation of the specified long value left by the specified number of bits.
since	1.5

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 low-order, side reenter on the left, or high-order.)

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 no-op, 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).

return	the value obtained by rotating the two's complement binary representation of the specified long value right by the specified number of bits.
since	1.5

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.)

return	the signum function of the specified long value.
since	1.5

Returns a string representation of the long argument as an unsigned integer in base 2.

The unsigned long value is the argument plus 2⁶⁴ 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 0s. 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.

i	a long to be converted to a string.
return	the string representation of the unsigned long value represented by the argument in binary (base 2).
since	JDK 1.0.2

Returns a string representation of the long argument as an unsigned integer in base 16.

The unsigned long value is the argument plus 2⁶⁴ 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 0s. 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 java.lang.String#toUpperCase() method may be called on the result:

 Long.toHexString(n).toUpperCase()
 

i	a long to be converted to a string.
return	the string representation of the unsigned long value represented by the argument in hexadecimal (base 16).
since	JDK 1.0.2

Returns a string representation of the long argument as an unsigned integer in base 8.

The unsigned long value is the argument plus 2⁶⁴ 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 0s.

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'.

i	a long to be converted to a string.
return	the string representation of the unsigned long value represented by the argument in octal (base 8).
since	JDK 1.0.2

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 radix-N digits in the order shown. Thus, the digits for hexadecimal (radix 16) are 0123456789abcdef. If uppercase letters are desired, the java.lang.String#toUpperCase() method may be called on the result:

 Long.toString(n, 16).toUpperCase()
 

i	a longto be converted to a string.
radix	the radix to use in the string representation.
return	a string representation of the argument in the specified radix.
See also	MAX_RADIX, MIN_RADIX

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 int) method.

i	a long to be converted.
return	a string representation of the argument in base 10.

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 java.lang.Long#toString(long) method.

return

a string representation of the value of this object in base 10.

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 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))

s	the string to be parsed
radix	the radix to be used in interpreting s
return	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.

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))
 

s	the string to be parsed.
return	a Long object holding the value represented by the string argument.
Throws	NumberFormatException: If the string cannot be parsed as a long.

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.

l	a long value.
return	a Long instance representing l.
since	1.5

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 java.lang.System#getProperty(java.lang.String) method. The string value of this property is then interpreted as a long value and a Long object representing this value is returned. Details of possible numeric formats can be found with the definition of getProperty.

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)

nm	property name.
return	the Long value of the property.
See also	getProperty(java.lang.String), getProperty(java.lang.String, java.lang.String)

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 java.lang.System#getProperty(java.lang.String) method. The string value of this property is then interpreted as a long value and a Long object representing this value is returned. Details of possible numeric formats can be found with the definition of getProperty.

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:

 Long result = getLong(nm, null);
 return (result == null) ? new Long(val) : result;
 

to avoid the unnecessary allocation of a Long object when the default value is not needed.

nm	property name.
val	default value.
return	the Long value of the property.
See also	getProperty(java.lang.String), getProperty(java.lang.String, java.lang.String)

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 java.lang.System#getProperty(java.lang.String) method. The string value of this property is then interpreted as a long value, as per the Long.decode method, and a Long object representing this value is returned.

• 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 method 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 method int) with radix 8.
• Otherwise the property value is parsed as a decimal integer exactly as by the method 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.

nm	property name.
val	default value.
return	the Long value of the property.
See also	getProperty(java.lang.String), getProperty(java.lang.String, java.lang.String), decode