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 long
    MAX_VALUE
    The largest value of type long.
    static final long
    MIN_VALUE
    The smallest value of type long.
    static Class<Long>
    TYPE
     

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    Description
    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.
    double
    doubleValue()
    Returns the value of this Long as a double.
    boolean
    equals(Object obj)
    Compares this object against the specified object.
    float
    floatValue()
    Returns the value of this Long as a float.
    int
    hashCode()
    Computes a hashcode for this Long.
    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
    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.
    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 Long
    valueOf(long i)
    Returns the object instance of i

    Methods inherited from class Number

    shortValue

    Methods inherited from class Object

    clone, 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:

  • 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.

  • 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.
      Specified by:
      compareTo in interface Comparable<Long>
      Parameters:
      l - 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.