java.lang
Class Long

java.lang.Object
  extended by java.lang.Number
      extended by java.lang.Long
All Implemented Interfaces:
Serializable

public final class Long
extends Number

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.

See Also:
Serialized Form

Field Summary
static long MAX_VALUE
          A constant holding the maximum value a long can have, 263-1.
static long MIN_VALUE
          A constant holding the minimum value a long can have, -263.
 
Constructor Summary
Long(long l)
          Constructs a newly allocated Long object that represents the specified long argument.
 
Method Summary
 byte byteValue()
          Returns the value of this Long as a byte.
 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.
 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.
 short shortValue()
          Returns the value of this Long as a short.
static String toBinaryString(long i)
          Creates a string representation of the long argument as an unsigned integer in base 2.
static String toHexString(long i)
          Creates a string representation of the long argument as an unsigned integer in base 16.
static String toOctalString(long i)
          Creates a string representation of the long argument as an unsigned integer in base 8.
 String toString()
          Returns a String object representing this Long's value.
static String toString(long l)
          Returns a new String object representing the specified integer.
static String toString(long value, 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
A constant holding the minimum value a long can have, -263.

See Also:
Constant Field Values

MAX_VALUE

public static final long MAX_VALUE
A constant holding the maximum value a long can have, 263-1.

See Also:
Constant Field Values
Constructor Detail

Long

public Long(long l)
Constructs a newly allocated Long object that represents the specified long argument.

Parameters:
l - the value to be represented by the Long object.
Method Detail

byteValue

public byte byteValue()
Returns the value of this Long as a byte.

Specified by:
byteValue in class Number
Returns:
the numeric value represented by this object after conversion to type byte.

shortValue

public short shortValue()
Returns the value of this Long as a short.

Specified by:
shortValue in class Number
Returns:
the numeric value represented by this object after conversion to type short.

intValue

public int intValue()
Returns the value of this Long as an int.

Specified by:
intValue in class Number
Returns:
the numeric value represented by this object after conversion to type int.

longValue

public long longValue()
Returns the value of this Long as a long value.

Specified by:
longValue in class Number
Returns:
the numeric value represented by this object after conversion to type long.

doubleValue

public double doubleValue()
Returns the value of this Long as a double.

Specified by:
doubleValue in class Number
Returns:
the numeric value represented by this object after conversion to type double.

floatValue

public float floatValue()
Returns the value of this Long as a float.

Specified by:
floatValue in class Number
Returns:
the numeric value represented by this object after conversion to type float.

toString

public static String toString(long value,
                              int radix)
Creates a string representation of the first argument in the radix specified by the second argument. 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.
 

Parameters:
value - a long.
radix - the radix.
Returns:
a string representation of the argument in the specified radix.

toString

public static String toString(long l)
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:
l - a long to be converted.
Returns:
a string representation of the argument in base 10.

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.

toHexString

public static String toHexString(long i)
Creates a string representation of the long argument as an unsigned integer in base 16.

The unsigned long value is the argument plus 264 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:

 0123456789abcdef
 
These are the characters '\u0030' through '\u0039' and 'u\0039' through '\u0066'.

Parameters:
i - a long.
Returns:
the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16).
Since:
JDK1.0.2

toOctalString

public static String toOctalString(long i)
Creates a string representation of the long argument as an unsigned integer in base 8.

The unsigned long value is the argument plus 264 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading 0s.

If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The octal digits are:

 01234567
 
These are the characters '\u0030' through '\u0037'.

Parameters:
i - a long
Returns:
the string representation of the unsigned integer value represented by the argument in octal (base 8).
Since:
JDK1.0.2

toBinaryString

public static String toBinaryString(long i)
Creates a string representation of the long argument as an unsigned integer in base 2.

The unsigned long value is the argument plus 264if the argument is negative; otherwise it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters '0' ('\u0030') and '1' ('\u0031') are used as binary digits.

Parameters:
i - a long.
Returns:
the string representation of the unsigned integer value represented by the argument in binary (base 2).
Since:
JDK1.0.2

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:

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
 

Parameters:
s - the String containing the long.
radix - the radix to be used.
Returns:
the long represented by the string argument in the specified radix.
Throws:
NumberFormatException - if the string does not contain a parsable integer.

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 parseLong(String, int) 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.

Parameters:
s - a string.
Returns:
the long represented by the argument in decimal.
Throws:
NumberFormatException - if the string does not contain a parsable long.

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.
See Also:
Object.equals(java.lang.Object), Hashtable

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.
See Also:
Boolean.hashCode(), Hashtable


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