Class Long

java.lang.Object
java.lang.Number
java.lang.Long
All Implemented Interfaces:
Comparable<Long>
public final class Long extends Number implements Comparable<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

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    BYTES
    The size of a long in bytes.
    static final long
    MAX_VALUE
    The largest value of type long.
    static final long
    MIN_VALUE
    The smallest value of type long.
    static final int
    SIZE
    The size of a long in bits.
    static Class<Long>
    TYPE
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    Long(long value)
    Constructs a newly allocated Long object that represents the primitive long argument.
    Long(String s)
    Deprecated.

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    bitCount(long i)
    The number of one bits.
    byte
    byteValue()
    Returns the value of this Long as a byte value.
    static int
    compare(long l1, long l2)
     
    int
    compareTo(Long l)
    Compares this object to the specified object to determine their relative order.
    static int
    compareUnsigned(long x, long y)
    Compares the two as unsigned values.
    static long
    compress(long i, long mask)
    The bits of i selected by mask, packed to the low end.
    static Long
    decode(String nm)
    Decodes a decimal, 0x, 0X, # or leading-zero octal long, with an optional sign.
    static long
    divideUnsigned(long dividend, long divisor)
    The unsigned quotient.
    double
    doubleValue()
    Returns the value of this Long as a double.
    boolean
    equals(Object obj)
    Compares this object against the specified object.
    static long
    expand(long i, long mask)
    The low bits of i spread to the positions of the one bits of mask.
    float
    floatValue()
    Returns the value of this Long as a float.
    static Long
    getLong(String nm)
    The system property nm as a Long, or null.
    static Long
    getLong(String nm, long val)
    The system property nm as a Long, or val.
    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.
    int
    hashCode()
    Computes a hashcode for this Long.
    static int
    hashCode(long value)
     
    static long
    highestOneBit(long i)
    The highest one bit alone, or 0.
    int
    intValue()
    Returns the value of this Long as an int value.
    long
    longValue()
    Returns the value of this Long as a long value.
    static long
    lowestOneBit(long i)
    The lowest one bit alone, or 0.
    static long
    max(long a, long b)
     
    static long
    min(long a, long b)
     
    static int
    numberOfLeadingZeros(long i)
    The number of zero bits above the highest one bit; 64 for zero.
    static int
    numberOfTrailingZeros(long i)
    The number of zero bits below the lowest one bit; 64 for zero.
    static long
    parseLong(CharSequence s, int beginIndex, int endIndex, int radix)
    Parses s from beginIndex to endIndex as a signed long.
    static long
    parseLong(String s)
    Parses the string argument as a signed decimal long.
    static long
    parseLong(String s, int radix)
    Parses the string argument as a signed long in the radix specified by the second argument.
    static long
    parseUnsignedLong(CharSequence s, int beginIndex, int endIndex, int radix)
    Parses s from beginIndex to endIndex as an unsigned long.
    static long
    parseUnsignedLong(String s)
    Parses an unsigned decimal long.
    static long
    parseUnsignedLong(String s, int radix)
    Parses an unsigned long in radix.
    static long
    remainderUnsigned(long dividend, long divisor)
    The unsigned remainder.
    static long
    reverse(long i)
    The bits in reverse order.
    static long
    reverseBytes(long i)
    The bytes in reverse order.
    static long
    rotateLeft(long i, int distance)
    The bits rotated left by distance.
    static long
    rotateRight(long i, int distance)
    The bits rotated right by distance.
    static int
    signum(long i)
    -1, 0 or 1 by the sign of i.
    static long
    sum(long a, long b)
     
    static String
    toBinaryString(long i)
    The value as unsigned binary digits.
    static String
    toHexString(long i)
    The value as unsigned hexadecimal digits.
    static String
    toOctalString(long i)
    The value as unsigned octal digits.
    String
    toString()
    Returns a String object representing this Long's value.
    static String
    toString(long i)
    Returns a new String object representing the specified integer.
    static String
    toString(long i, int radix)
    Creates a string representation of the first argument in the radix specified by the second argument.
    static String
    toUnsignedString(long i)
    The value as an unsigned decimal string.
    static String
    toUnsignedString(long i, int radix)
    The value as an unsigned string in radix.
    static Long
    valueOf(long i)
    Returns the object instance of i
    static Long
    valueOf(String s)
    A Long of parseLong(s).
    static Long
    valueOf(String s, int radix)
    A Long of parseLong(s, radix).

    Methods inherited from class Number

    shortValue

    Methods inherited from class Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

  • Field Details

    • TYPE

      public static Class<Long> TYPE

    • MAX_VALUE

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

    • MIN_VALUE

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

    • BYTES

      public static final int BYTES
      The size of a long in bytes.
      See Also:

    • SIZE

      public static final int SIZE
      The size of a long in bits.
      See Also:

  • 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

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

  • Method Details

    • doubleValue

      public double doubleValue()
      Returns the value of this Long as a double.
      Specified by:
      doubleValue in class Number

    • 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.
      Overrides:
      equals in class Object

    • floatValue

      public float floatValue()
      Returns the value of this Long as a float.
      Specified by:
      floatValue in class Number

    • 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))
      Overrides:
      hashCode in class Object

    • longValue

      public long longValue()
      Returns the value of this Long as a long value.
      Specified by:
      longValue in class Number

    • intValue

      public int intValue()
      Returns the value of this Long as an int value.
      Specified by:
      intValue in class Number

    • byteValue

      public byte byteValue()
      Returns the value of this Long as a byte value.
      Overrides:
      byteValue in class Number

    • 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.
      Throws:
      NumberFormatException

    • 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
      Throws:
      NumberFormatException

    • 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.
      Overrides:
      toString in class Object

    • 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: the primitive
      Returns

      object instance

    • compare

      public static int compare(long l1, long l2)

    • compareTo

      public int compareTo(Long l)
      Description copied from interface: Comparable

      Compares this object to the specified object to determine their relative order.

      Parameters
      • another: the object to compare to this instance.
      Returns
      Specified by:
      compareTo in interface Comparable<Long>
      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: @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).
      Throws:
      NumberFormatException

    • valueOf

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

    • 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.
      Throws:
      NumberFormatException

    • parseUnsignedLong

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

    • 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.
      Throws:
      NumberFormatException

    • 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.
      Throws:
      NumberFormatException

    • decode

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

    • 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.