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
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 = 9223372036854775807L | The largest value of type long. |
public static final long MIN_VALUE = -9223372036854775808L | The smallest value of type long. |
public static final int BYTES = 8 | The size of a long in bytes. |
public static final int SIZE = 64 | The 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 NumberFormatException | Deprecated A Long of parseLong(s). |
Methods
Inherited methods
From Number
Field details
TYPE
public static Class<Long> TYPEMAX_VALUE
public static final long MAX_VALUE = 9223372036854775807LThe largest value of type long.
See Also:Constant Field Values
MIN_VALUE
public static final long MIN_VALUE = -9223372036854775808LThe smallest value of type long.
See Also:Constant Field Values
BYTES
public static final int BYTES = 8The size of a long in bytes.
SIZE
public static final int SIZE = 64The 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 NumberFormatExceptionDeprecated.
A Long of
parseLong(s).Throws
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 NumberFormatExceptionParses 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.
Throws
parseLong
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. 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
Throws
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
ilong- 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
lLong- 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
anothercannot be converted into something comparable tothisinstance.
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 NumberFormatExceptionA Long of
parseLong(s).Throws
valueOf
public static Long valueOf(String s, int radix)
throws NumberFormatExceptionA Long of
parseLong(s, radix).Throws
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 NumberFormatExceptionParses an unsigned decimal long.
Throws
parseUnsignedLong
public static long parseUnsignedLong(String s, int radix)
throws NumberFormatExceptionParses an unsigned long in
radix.Throws
parseLong
public static long parseLong(CharSequence s, int beginIndex, int endIndex, int radix)
throws NumberFormatExceptionParses
s from beginIndex to endIndex as a signed long.Throws
parseUnsignedLong
public static long parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix)
throws NumberFormatExceptionParses
s from beginIndex to endIndex as an unsigned long.Throws
decode
public static Long decode(String nm)
throws NumberFormatExceptionDecodes a decimal,
0x, 0X, # or leading-zero octal long, with an
optional sign.Throws
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.