java.lang

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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 java.lang.Number

shortValue

Methods inherited from class java.lang.Object

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

Field Detail

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:

Constant Field Values

MIN_VALUE

public static final long MIN_VALUE

The smallest value of type long. See Also:Constant Field Values

See Also:

Constant Field Values

Constructor Detail

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 Detail

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.