
Java Platform 1.2 Beta 4 

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SUMMARY: INNER  FIELD  CONSTR  METHOD  DETAIL: FIELD  CONSTR  METHOD 
java.lang.Object  +java.lang.Number  +java.lang.Double
double
in an object. An object of type
Double
contains a single field whose type is
double
.
In addition, this class provides several methods for converting a
double
to a String
and a
String
to a double
, as well as other
constants and methods useful when dealing with a
double
.
Field Summary  
static double  MAX_VALUE
The largest positive value of type double . 
static double  MIN_VALUE
The smallest positive value of type double . 
static double  NaN
A NaN value of type double . 
static double  NEGATIVE_INFINITY
The negative infinity of type double . 
static double  POSITIVE_INFINITY
The positive infinity of type double . 
static Class  TYPE
The Class object representing the primitive type double. 
static int  WIDEFP_MAX_EXPONENT
If a doubleextended format is available to code that has been declared to be or is by default FPwide, this value is the maximum exponent that can be represented in the doubleextended format. 
static int  WIDEFP_MIN_EXPONENT
If a doubleextended format is available to code that has been declared to be or is by default FPwide, this value is the minimum exponent that can be represented in the doubleextended format. 
static int  WIDEFP_SIGNIFICAND_BITS
If a doubleextended format is available to code that has been declared to be or is by default FPwide, this value is the number of bits of significand that can be represented in the doubleextended format. 
Constructor Summary  
Double(double value)
Constructs a newly allocated Double object that
represents the primitive double argument. 

Double(String s)
Constructs a newly allocated Double object that
represents the floating point value of type double
represented by the string. 
Method Summary  
byte  byteValue()
Returns the value of this Double as a byte (by casting to a byte). 
int  compareTo(Double anotherDouble)
Compares two Doubles numerically. 
int  compareTo(Object o)
Compares this Double to another Object. 
static long  doubleToLongBits(double value)
Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout. 
double  doubleValue()
Returns the double value of this Double. 
boolean  equals(Object obj)
Compares this object against the specified object. 
float  floatValue()
Returns the float value of this Double. 
int  hashCode()
Returns a hashcode for this Double. 
int  intValue()
Returns the integer value of this Double (by casting to an int). 
boolean  isInfinite()
Returns true if this Double value is infinitely large in magnitude. 
static boolean  isInfinite(double v)
Returns true if the specified number is infinitely large in magnitude. 
boolean  isNaN()
Returns true if this Double value is the special NotaNumber (NaN) value. 
static boolean  isNaN(double v)
Returns true if the specified number is the special NotaNumber (NaN) value. 
static double  longBitsToDouble(long bits)
Returns the doublefloat corresponding to a given bit represention. 
long  longValue()
Returns the long value of this Double (by casting to a long). 
short  shortValue()
Returns the value of this Double as a short (by casting to a short). 
String  toString()
Returns a String representation of this Double object. 
static String  toString(double d)
Creates a string representation of the double
argument.

static Double  valueOf(String s)
Returns a new Double value initialized to the value represented by the specified String. 
Methods inherited from class java.lang.Object  
clone , finalize , getClass , notify , notifyAll , wait , wait , wait 
Field Detail 
public static final double POSITIVE_INFINITY
double
.public static final double NEGATIVE_INFINITY
double
.public static final double NaN
double
.public static final double MAX_VALUE
double
.public static final double MIN_VALUE
double
.public static final int WIDEFP_SIGNIFICAND_BITS
public static final int WIDEFP_MIN_EXPONENT
public static final int WIDEFP_MAX_EXPONENT
public static final Class TYPE
Constructor Detail 
public Double(double value)
Double
object that
represents the primitive double
argument.
value
 the value to be represented by the Double
.public Double(String s) throws NumberFormatException
Double
object that
represents the floating point value of type double
represented by the string. The string is converted to a
double
value as if by the valueOf
method.
s
 a string to be converted to a Double
.valueOf(java.lang.String)
Method Detail 
public static String toString(double d)
double
argument.
The values NaN
, NEGATIVE_INFINITY
,
POSITIVE_INFINITY
, 0.0
, and
+0.0
are represented by the strings
"NaN"
, "Infinity"
,
"Infinity"
, "0.0"
, and
"0.0"
, respectively.
If d
is in the range
10^{3} <= d <=10^{7}
,
then it is converted to a string in the style
[]ddd.ddd
. Otherwise, it is converted to a
string in the style []m.ddddE±xx
.
There is always a minimum of one digit after the decimal point.
The number of digits is the minimum needed to uniquely distinguish
the argument value from adjacent values of type
double
.
d
 the double to be converted.public static Double valueOf(String s) throws NumberFormatException
s
 the string to be parsed.Double
initialized to the
value represented by the string argument.public static boolean isNaN(double v)
v
 the value to be tested.true
if the value of the argument is NaN;
false
otherwise.public static boolean isInfinite(double v)
v
 the value to be tested.true
if the value of the argument is positive
infinity or negative infinity; false
otherwise.public boolean isNaN()
true
if the value represented by this object is
NaN; false
otherwise.public boolean isInfinite()
true
if the value represented by this object is
positive infinity or negative infinity;
false
otherwise.public String toString()
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.toString(double)
public byte byteValue()
public short shortValue()
public int intValue()
double
value represented by this object is
converted to type int
and the result of the
conversion is returned.public long longValue()
double
value represented by this object is
converted to type long
and the result of the
conversion is returned.public float floatValue()
double
value represented by this object is
converted to type float
and the result of the
conversion is returned.public double doubleValue()
double
value represented by this object.public int hashCode()
hash code
value for this object.public boolean equals(Object obj)
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.
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
d1.doubleValue() == d2.doubleValue()
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.
obj
 the object to compare with.true
if the objects are the same;
false
otherwise.public static long doubleToLongBits(double value)
Bit 63 represents the sign of the floatingpoint number. Bits 6252 represent the exponent. Bits 510 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
.
value
 a double precision floatingpoint number.public static double longBitsToDouble(long bits)
If the argument is 0x7f80000000000000L
, the result
is positive infinity.
If the argument is 0xff80000000000000L
, 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 are, in effect, lumped together by the Java language
into a single value.
bits
 any long
integer.double
floatingpoint value with the same
bit pattern.public int compareTo(Double anotherDouble)
anotherDouble
 the Double
to be compared.0
if the argument Double is equal to
this Double; a value less than 0
if this Double
is numerically less than the Double argument; and a
value greater than 0
if this Double is
numerically greater than the Double argument
(signed comparison).public int compareTo(Object o)
compareTo(Double)
. Otherwise,
it throws a ClassCastException
(as Doubles are comparable
only to other Doubles).
o
 the Object
to be compared.0
if the argument is a Double
numerically equal to this Double; a value less than
0
if the argument is a Double numerically
greater than this Double; and a value greater than
0
if the argument is a Double numerically
less than this Double.ClassCastException
 if the argument is not a
Double
.Comparable

Java Platform 1.2 Beta 4 

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