java.lang
Class Long

java.lang.Object
  |
  +--java.lang.Long

public final class Long

extends Object

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

Field Summary
static long	MAX_VALUE           The largest value of type long.
static long	MIN_VALUE           The smallest value of type long.

 

Constructor Summary

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

 

Method Summary
boolean	equals(Object obj)           Compares this object against the specified object.
int	hashCode()           Computes a hashcode for this Long.
long	longValue()           Returns the value of this Long as a long value.
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.

 

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

MIN_VALUE

public static final long MIN_VALUE

The smallest value of type long.

MAX_VALUE

public static final long MAX_VALUE

The largest value of type long.

Long

public Long(long value)

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

Parameters:

value - the value to be represented by the Long object.

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. If uppercase letters are desired, the String.toUpperCase() method may be called on the result:

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

Parameters:

i - a long.

radix - the radix.

Returns:

a string representation of the argument in the specified radix.

See Also:

Character.MAX_RADIX, Character.MIN_RADIX

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 toString(long, int) method that takes two arguments.

Parameters:

i - a long to be converted.

Returns:

a string representation of the argument in base 10.

longValue

public long longValue()

Returns the value of this Long as a long value.

Returns:

the long value represented by this object.

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 toString(long) method that takes one argument.

Overrides:

toString in class Object

Returns:

a string representation of this object in base 10.

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

Returns:

a hash code value for this object.

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

Parameters:

obj - the object to compare with.

Returns:

true if the objects are the same; false otherwise.