Public Member Functions  
Double (jdouble _value=0)  
Constructs a newly allocated Double object that represents the primitive double argument.  
operator jdouble & ()  
virtual jboolean  isNaN () const 
Returns true if this Double value is NotaNumber (NaN).  
virtual jboolean  isInfinite () const 
Returns true if this Double value is infinitely large in magnitude.  
virtual String  toString () const 
Returns a String representation of this Double object.  
virtual jbyte  byteValue () const 
Returns the value of this Double as a byte.  
virtual jshort  shortValue () const 
Returns the value of this Double as a short.  
virtual jint  intValue () const 
Returns the value of this Double as an int.  
virtual jlong  longValue () const 
Returns the value of this Double as a long .  
virtual jfloat  floatValue () const 
Returns the value of this Double as a float .  
virtual jdouble  doubleValue () const 
Returns the value of this Float as a double .  
virtual jboolean  equals (const Object &src) const 
Compares this object against the specified object.  
virtual jint  hashCode () const 
Returns a hashcode for this Double object.  
virtual jint  compareTo (const Object &src) const 
Compares two Doubles numerically.  
Static Public Member Functions  
static jlong  doubleToLongBits (jdouble value) 
Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout.  
static jdouble  longBitsToDouble (jlong bits) 
Returns the doublefloat corresponding to a given bit represention.  
static jboolean  isNaN (jdouble v) 
Returns true if the specified number is the special NotaNumber (NaN) value.  
static jboolean  isInfinite (jdouble v) 
Returns true if the specified number is infinitely large in magnitude.  
static String  toString (jdouble f) 
Creates a string representation of the double argument.  
static Double  valueOf (const String &s) 
Returns a new Double object initialized to the value represented by the specified string.  
static jdouble  parseDouble (const String &s) 
Returns a new double initialized to the value represented by the specified String , as performed by the valueOf method of class Double .  
Static Public Attributes  
static const jdouble  POSITIVE_INFINITY 
The positive infinity of type double .  
static const jdouble  NEGATIVE_INFINITY 
The negative infinity of type double .  
static const jdouble  NaN 
The NotaNumber (NaN) value of type double .  
static const jdouble  MIN_VALUE 
The smallest positive value of type double .  
static const jdouble  MAX_VALUE 
The largest positive value of type double . 
java::lang::Double::Double  (  jdouble  _value = 0 
) 
Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout.
Bit 63 (the bit that is selected by the mask 0x8000000000000000L
) represents the sign of the floatingpoint number. Bits 6252 (the bits that are selected by the mask 0x7ff0000000000000L
) represent the exponent. Bits 510 (the bits that are selected by the mask 0x000fffffffffffffL
) represent the significand (sometimes called the mantissa) of the floatingpoint number.
If the argument is positive infinity, the result is 0x7ff0000000000000L
.
If the argument is negative infinity, the result is 0xfff0000000000000L
.
If the argument is NaN, the result is 0x7ff8000000000000L
.
In all cases, the result is a long
integer that, when given to the longBitsToDouble(long) method, will produce a floatingpoint value equal to the argument to doubleToLongBits
.
value  a double precision floatingpoint number. 
Returns the doublefloat corresponding to a given bit represention.
The argument is considered to be a representation of a floatingpoint value according to the IEEE 754 floatingpoint "double precision" bit layout. That floatingpoint value is returned as the result.
If the argument is 0x7ff0000000000000L
, the result is positive infinity.
If the argument is 0xfff0000000000000L
, the result is negative infinity.
If the argument is any value in the range 0x7ff0000000000001L
through 0x7fffffffffffffffL
or in the range 0xfff0000000000001L
through 0xffffffffffffffffL
, the result is NaN. All IEEE 754 NaN values of type double
are, in effect, lumped together by the Java programming language into a single value called NaN. Distinct values of NaN are only accessible by use of the Double.doubleToRawLongBits
method.
In all other cases, let s, e, and m be three values that can be computed from the argument: <blockquote>
int s = ((bits >> 63) == 0) ? 1 : 1; int e = (int)((bits >> 52) & 0x7ffL); long m = (e == 0) ? (bits & 0xfffffffffffffL) << 1 : (bits & 0xfffffffffffffL)  0x10000000000000L;</blockquote> Then the floatingpoint result equals the value of the mathematical expression s·m·2^{e1075}.
bits  any long integer. 
double
floatingpoint value with the same bit pattern. Returns true if the specified number is the special NotaNumber (NaN) value.
v  the value to be tested. 
true
if the argument is NaN; false
otherwise. Returns true if the specified number is infinitely large in magnitude.
v  the value to be tested. 
true
if the argument is positive infinity or negative infinity; false
otherwise.
Creates a string representation of the double
argument.
All characters mentioned below are ASCII characters.

' ('
'); if the sign is positive, no sign character appears in the result. As for the magnitude m: "Infinity"
; thus, positive infinity produces the result "Infinity"
and negative infinity produces the result "Infinity"
. "0.0"
; thus, negative zero produces the result "0.0"
and positive zero produces the result "0.0"
. '.'
(
), followed by one or more decimal digits representing the fractional part of m. '.'
(
), followed by decimal digits representing the fractional part of a, followed by the letter 'E'
(
), followed by a representation of n as a decimal integer, as produced by the method Integer#toString(int).
How many digits must be printed for the fractional part of m or a? There must be at least one digit to represent the fractional part, and beyond that as many, but only as many, more digits as are needed to uniquely distinguish the argument value from adjacent values of type double
. That is, suppose that x is the exact mathematical value represented by the decimal representation produced by this method for a finite nonzero argument d. Then d must be the double
value nearest to x; or if two double
values are equally close to x, then d must be one of them and the least significant bit of the significand of d must be 0
.
d  the double to be converted. 
Returns a new Double
object initialized to the value represented by the specified string.
The string s
is interpreted as the representation of a floatingpoint value and a Double
object representing that value is created and returned.
If s
is null
, then a NullPointerException
is thrown.
Leading and trailing whitespace characters in s are ignored. The rest of s
should constitute a FloatValue as described by the lexical rule: <blockquote>
FloatValue:
Sign_{opt} FloatingPointLiteral</blockquote> where Sign and FloatingPointLiteral are as defined in ?.10.2 of the Java Language Specification. If it does not have the form of a FloatValue, then a
NumberFormatException
is thrown. Otherwise, it is regarded as representing an exact decimal value in the usual "computerized scientific notation"; this exact decimal value is then conceptually converted to an "infinitely precise" binary value that is then rounded to type double
by the usual roundtonearest rule of IEEE 754 floatingpoint arithmetic. Finally, a new object of class Double
is created to represent the double
value.
s  the string to be parsed. 
Double
initialized to the value represented by the string argument. NumberFormatException  if the string does not contain a parsable number. 
Returns a new double initialized to the value represented by the specified String
, as performed by the valueOf
method of class Double
.
s  the string to be parsed. 
NumberFormatException  if the string does not contain a parsable double. 
java::lang::Double::operator jdouble &  (  ) 
virtual jboolean java::lang::Double::isNaN  (  )  const [virtual] 
Returns true if this Double
value is NotaNumber (NaN).
true
if the value represented by this object is NaN; false
otherwise. virtual jboolean java::lang::Double::isInfinite  (  )  const [virtual] 
Returns true if this Double value is infinitely large in magnitude.
true
if the value represented by this object is positive infinity or negative infinity; false
otherwise. virtual String java::lang::Double::toString  (  )  const [virtual] 
Returns a String representation of this Double object.
The primitive double
value represented by this object is converted to a String
exactly as if by the method toString
of one argument.
String
representation of this object. Reimplemented from java::lang::Object.
virtual jbyte java::lang::Double::byteValue  (  )  const [virtual] 
virtual jshort java::lang::Double::shortValue  (  )  const [virtual] 
virtual jint java::lang::Double::intValue  (  )  const [virtual] 
Returns the value of this Double as an int.
int
value represented by this object. Implements java::lang::Number.
virtual jlong java::lang::Double::longValue  (  )  const [virtual] 
Returns the value of this Double as a long
.
byte
value represented by this object that is converted to type long
and the result of the conversion is returned. Implements java::lang::Number.
virtual jfloat java::lang::Double::floatValue  (  )  const [virtual] 
Returns the value of this Double as a float
.
byte
value represented by this object is converted to type float
and the result of the conversion is returned. Implements java::lang::Number.
virtual jdouble java::lang::Double::doubleValue  (  )  const [virtual] 
Returns the value of this Float as a double
.
byte
value represented by this object is converted to type double
and the result of the conversion is returned. Implements java::lang::Number.
Compares this object against the specified object.
The result is true
if and only if the argument is not null
and is a Double
object that represents a double that has the identical bit pattern to the bit pattern of the double represented by this object. For this purpose, two double
values are considered to be the same if and only if the method doubleToLongBits(double) returns the same long value when applied to each.
Note that in most cases, for two instances of class Double
, d1
and d2
, the value of d1.equals(d2)
is true
if and only if <blockquote>
d1.doubleValue() == d2.doubleValue()</blockquote>
also has the value true
. However, there are two exceptions:
d1
and d2
both represent Double.NaN
, then the equals
method returns true
, even though Double.NaN==Double.NaN
has the value false
. d1
represents +0.0
while d2
represents 0.0
, or vice versa, the equal
test has the value false
, even though +0.0==0.0
has the value true
. This allows hashtables to operate properly.
obj  the object to compare with. 
true
if the objects are the same; false
otherwise. Reimplemented from java::lang::Object.
virtual jint java::lang::Double::hashCode  (  )  const [virtual] 
Returns a hashcode for this Double
object.
The result is the exclusive OR of the two halves of the long integer bit representation, exactly as produced by the method doubleToLongBits(double), of the primitive double
value represented by this Double
object. That is, the hashcode is the value of the expression: <blockquote>
(int)(v^(v>>>32))</blockquote> where
v
is defined by: <blockquote>long v = Double.doubleToLongBits(this.doubleValue());</blockquote>
hash code
value for this object. Reimplemented from java::lang::Object.
Compares two Doubles numerically.
There are two ways in which comparisons performed by this method differ from those performed by the Java language numerical comparison operators (<, <=, ==, >= >
) when applied to primitive doubles:
Double.NaN
is considered by this method to be equal to itself and greater than all other double values (including Double.POSITIVE_INFINITY
). 0.0d
is considered by this method to be greater than 0.0d
.
anotherDouble  the Double to be compared. 
0
if anotherDouble
is numerically equal to this Double; a value less than 0
if this Double is numerically less than anotherDouble
; and a value greater than 0
if this Double is numerically greater than anotherDouble
.Reimplemented from java::lang::Comparable.
const jdouble java::lang::Double::POSITIVE_INFINITY [static] 
The positive infinity of type double
.
It is equal to the value returned by Double.longBitsToDouble(0x7f80000000000000)
.
const jdouble java::lang::Double::NEGATIVE_INFINITY [static] 
The negative infinity of type double
.
It is equal to the value returned by Double.longBitsToDouble(0xff80000000000000)
.
const jdouble java::lang::Double::NaN [static] 
The NotaNumber (NaN) value of type double
.
It is equal to the value returned by Double.longBitsToDouble(0x7fc0000000000000)
.
const jdouble java::lang::Double::MIN_VALUE [static] 
The smallest positive value of type double
.
It is equal to the value returned by Double.longBitsToDouble(0x1)
.
const jdouble java::lang::Double::MAX_VALUE [static] 
The largest positive value of type double
.
It is equal to the value returned by Double.longBitsToDouble(0x7f7fffffffffffff)
.