Class Double
 java.lang.Object

 java.lang.Number

 java.lang.Double
 All Implemented Interfaces:

Serializable
,Comparable<Double>
public final class Double extends Number implements Comparable<Double>
The Double
class wraps a value of the primitive type 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
.
 Since:
 1.0
 See Also:
 Serialized Form
Field Summary
Modifier and Type  Field  Description 

static int  BYTES  The number of bytes used to represent a 
static int  MAX_EXPONENT  Maximum exponent a finite 
static double  MAX_VALUE  A constant holding the largest positive finite value of type 
static int  MIN_EXPONENT  Minimum exponent a normalized 
static double  MIN_NORMAL  A constant holding the smallest positive normal value of type 
static double  MIN_VALUE  A constant holding the smallest positive nonzero value of type 
static double  NaN  A constant holding a NotaNumber (NaN) value of type 
static double  NEGATIVE_INFINITY  A constant holding the negative infinity of type 
static double  POSITIVE_INFINITY  A constant holding the positive infinity of type 
static int  SIZE  The number of bits used to represent a 
static Class<Double>  TYPE  The 
Constructor Summary
Constructor  Description 

Double(double value)  Deprecated. It is rarely appropriate to use this constructor. 
Double(String s)  Deprecated. It is rarely appropriate to use this constructor. 
Method Summary
Modifier and Type  Method  Description 

byte  byteValue()  Returns the value of this 
static int  compare(double d1,
double d2)  Compares the two specified 
int  compareTo(Double anotherDouble)  Compares two 
static long  doubleToLongBits(double value)  Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout. 
static long  doubleToRawLongBits(double value)  Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout, preserving NotaNumber (NaN) values. 
double  doubleValue()  Returns the 
boolean  equals(Object obj)  Compares this object against the specified object. 
float  floatValue()  Returns the value of this 
int  hashCode()  Returns a hash code for this 
static int  hashCode(double value)  Returns a hash code for a 
int  intValue()  Returns the value of this 
static boolean  isFinite(double d)  Returns 
boolean  isInfinite()  Returns 
static boolean  isInfinite(double v)  Returns 
boolean  isNaN()  Returns 
static boolean  isNaN(double v)  Returns 
static double  longBitsToDouble(long bits)  Returns the 
long  longValue()  Returns the value of this 
static double  max(double a,
double b)  Returns the greater of two 
static double  min(double a,
double b)  Returns the smaller of two 
static double  parseDouble(String s)  Returns a new 
short  shortValue()  Returns the value of this 
static double  sum(double a,
double b)  Adds two 
static String  toHexString(double d)  Returns a hexadecimal string representation of the 
String  toString()  Returns a string representation of this 
static String  toString(double d)  Returns a string representation of the 
static Double  valueOf(double d)  Returns a 
static Double  valueOf(String s)  Returns a 
Methods declared in class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Field Detail
POSITIVE_INFINITY
public static final double POSITIVE_INFINITY
A constant holding the positive infinity of type double
. It is equal to the value returned by Double.longBitsToDouble(0x7ff0000000000000L)
.
 See Also:
 Constant Field Values
NEGATIVE_INFINITY
public static final double NEGATIVE_INFINITY
A constant holding the negative infinity of type double
. It is equal to the value returned by Double.longBitsToDouble(0xfff0000000000000L)
.
 See Also:
 Constant Field Values
NaN
public static final double NaN
A constant holding a NotaNumber (NaN) value of type double
. It is equivalent to the value returned by Double.longBitsToDouble(0x7ff8000000000000L)
.
 See Also:
 Constant Field Values
MAX_VALUE
public static final double MAX_VALUE
A constant holding the largest positive finite value of type double
, (22^{52})·2^{1023}. It is equal to the hexadecimal floatingpoint literal 0x1.fffffffffffffP+1023
and also equal to Double.longBitsToDouble(0x7fefffffffffffffL)
.
 See Also:
 Constant Field Values
MIN_NORMAL
public static final double MIN_NORMAL
A constant holding the smallest positive normal value of type double
, 2^{1022}. It is equal to the hexadecimal floatingpoint literal 0x1.0p1022
and also equal to Double.longBitsToDouble(0x0010000000000000L)
.
 Since:
 1.6
 See Also:
 Constant Field Values
MIN_VALUE
public static final double MIN_VALUE
A constant holding the smallest positive nonzero value of type double
, 2^{1074}. It is equal to the hexadecimal floatingpoint literal 0x0.0000000000001P1022
and also equal to Double.longBitsToDouble(0x1L)
.
 See Also:
 Constant Field Values
MAX_EXPONENT
public static final int MAX_EXPONENT
Maximum exponent a finite double
variable may have. It is equal to the value returned by Math.getExponent(Double.MAX_VALUE)
.
 Since:
 1.6
 See Also:
 Constant Field Values
MIN_EXPONENT
public static final int MIN_EXPONENT
Minimum exponent a normalized double
variable may have. It is equal to the value returned by Math.getExponent(Double.MIN_NORMAL)
.
 Since:
 1.6
 See Also:
 Constant Field Values
SIZE
public static final int SIZE
The number of bits used to represent a double
value.
 Since:
 1.5
 See Also:
 Constant Field Values
BYTES
public static final int BYTES
The number of bytes used to represent a double
value.
 Since:
 1.8
 See Also:
 Constant Field Values
TYPE
public static final Class<Double> TYPE
The Class
instance representing the primitive type double
.
 Since:
 1.1
Constructor Detail
Double
@Deprecated(since="9") public Double(double value)
valueOf(double)
is generally a better choice, as it is likely to yield significantly better space and time performance.Constructs a newly allocated Double
object that represents the primitive double
argument.
 Parameters:

value
 the value to be represented by theDouble
.
Double
@Deprecated(since="9") public Double(String s) throws NumberFormatException
parseDouble(String)
to convert a string to a double
primitive, or use valueOf(String)
to convert a string to a Double
object.Constructs a newly allocated Double
object that represents the floatingpoint value of type double
represented by the string. The string is converted to a double
value as if by the valueOf
method.
 Parameters:

s
 a string to be converted to aDouble
.  Throws:

NumberFormatException
 if the string does not contain a parsable number.
Method Detail
toString
public static String toString(double d)
Returns a string representation of the double
argument. All characters mentioned below are ASCII characters.
 If the argument is NaN, the result is the string "
NaN
".  Otherwise, the result is a string that represents the sign and magnitude (absolute value) of the argument. If the sign is negative, the first character of the result is '

' ('\u002D'
); if the sign is positive, no sign character appears in the result. As for the magnitude m: If m is infinity, it is represented by the characters
"Infinity"
; thus, positive infinity produces the result"Infinity"
and negative infinity produces the result"Infinity"
.  If m is zero, it is represented by the characters
"0.0"
; thus, negative zero produces the result"0.0"
and positive zero produces the result"0.0"
.  If m is greater than or equal to 10^{3} but less than 10^{7}, then it is represented as the integer part of m, in decimal form with no leading zeroes, followed by '
.
' ('\u002E'
), followed by one or more decimal digits representing the fractional part of m.  If m is less than 10^{3} or greater than or equal to 10^{7}, then it is represented in socalled "computerized scientific notation." Let n be the unique integer such that 10^{n} ≤ m < 10^{n+1}; then let a be the mathematically exact quotient of m and 10^{n} so that 1 ≤ a < 10. The magnitude is then represented as the integer part of a, as a single decimal digit, followed by '
.
' ('\u002E'
), followed by decimal digits representing the fractional part of a, followed by the letter 'E
' ('\u0045'
), followed by a representation of n as a decimal integer, as produced by the methodInteger.toString(int)
.
 If m is infinity, it is represented by the characters
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
.
To create localized string representations of a floatingpoint value, use subclasses of NumberFormat
.
 Parameters:

d
 thedouble
to be converted.  Returns:
 a string representation of the argument.
toHexString
public static String toHexString(double d)
Returns a hexadecimal string representation of the double
argument. All characters mentioned below are ASCII characters.
 If the argument is NaN, the result is the string "
NaN
".  Otherwise, the result is a string that represents the sign and magnitude of the argument. If the sign is negative, the first character of the result is '

' ('\u002D'
); if the sign is positive, no sign character appears in the result. As for the magnitude m: If m is infinity, it is represented by the string
"Infinity"
; thus, positive infinity produces the result"Infinity"
and negative infinity produces the result"Infinity"
.  If m is zero, it is represented by the string
"0x0.0p0"
; thus, negative zero produces the result"0x0.0p0"
and positive zero produces the result"0x0.0p0"
.  If m is a
double
value with a normalized representation, substrings are used to represent the significand and exponent fields. The significand is represented by the characters"0x1."
followed by a lowercase hexadecimal representation of the rest of the significand as a fraction. Trailing zeros in the hexadecimal representation are removed unless all the digits are zero, in which case a single zero is used. Next, the exponent is represented by"p"
followed by a decimal string of the unbiased exponent as if produced by a call toInteger.toString
on the exponent value.  If m is a
double
value with a subnormal representation, the significand is represented by the characters"0x0."
followed by a hexadecimal representation of the rest of the significand as a fraction. Trailing zeros in the hexadecimal representation are removed. Next, the exponent is represented by"p1022"
. Note that there must be at least one nonzero digit in a subnormal significand.
 If m is infinity, it is represented by the string
Floatingpoint Value  Hexadecimal String 

1.0  0x1.0p0 
1.0  0x1.0p0 
2.0  0x1.0p1 
3.0  0x1.8p1 
0.5  0x1.0p1 
0.25  0x1.0p2 
Double.MAX_VALUE  0x1.fffffffffffffp1023 
Minimum Normal Value  0x1.0p1022 
Maximum Subnormal Value  0x0.fffffffffffffp1022 
Double.MIN_VALUE  0x0.0000000000001p1022 
 Parameters:

d
 thedouble
to be converted.  Returns:
 a hex string representation of the argument.
 Since:
 1.5
valueOf
public static Double valueOf(String s) throws NumberFormatException
Returns a Double
object holding the double
value represented by the argument string s
.
If s
is null
, then a NullPointerException
is thrown.
Leading and trailing whitespace characters in s
are ignored. Whitespace is removed as if by the String.trim()
method; that is, both ASCII space and control characters are removed. The rest of s
should constitute a FloatValue as described by the lexical syntax rules:
where Sign, FloatingPointLiteral, HexNumeral, HexDigits, SignedInteger and FloatTypeSuffix are as defined in the lexical structure sections of The Java™ Language Specification, except that underscores are not accepted between digits. If
 FloatValue:
 Sign_{opt}
NaN
 Sign_{opt}
Infinity
 Sign_{opt} FloatingPointLiteral
 Sign_{opt} HexFloatingPointLiteral
 SignedInteger
 HexFloatingPointLiteral:
 HexSignificand BinaryExponent FloatTypeSuffix_{opt}
 HexSignificand:
 HexNumeral
 HexNumeral
.
0x
HexDigits_{opt}.
HexDigits0X
HexDigits_{opt}.
HexDigits
 BinaryExponent:
 BinaryExponentIndicator SignedInteger
 BinaryExponentIndicator:
p
P
s
does not have the form of a FloatValue, then a NumberFormatException
is thrown. Otherwise, s
is regarded as representing an exact decimal value in the usual "computerized scientific notation" or as an exact hexadecimal value; this exact numerical 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, which includes preserving the sign of a zero value. Note that the roundtonearest rule also implies overflow and underflow behaviour; if the exact value of s
is large enough in magnitude (greater than or equal to (MAX_VALUE
+ ulp(MAX_VALUE)
/2), rounding to double
will result in an infinity and if the exact value of s
is small enough in magnitude (less than or equal to MIN_VALUE
/2), rounding to float will result in a zero. Finally, after rounding a Double
object representing this double
value is returned. To interpret localized string representations of a floatingpoint value, use subclasses of NumberFormat
.
Note that trailing format specifiers, specifiers that determine the type of a floatingpoint literal (1.0f
is a float
value; 1.0d
is a double
value), do not influence the results of this method. In other words, the numerical value of the input string is converted directly to the target floatingpoint type. The twostep sequence of conversions, string to float
followed by float
to double
, is not equivalent to converting a string directly to double
. For example, the float
literal 0.1f
is equal to the double
value 0.10000000149011612
; the float
literal 0.1f
represents a different numerical value than the double
literal 0.1
. (The numerical value 0.1 cannot be exactly represented in a binary floatingpoint number.)
To avoid calling this method on an invalid string and having a NumberFormatException
be thrown, the regular expression below can be used to screen the input string:
final String Digits = "(\\p{Digit}+)"; final String HexDigits = "(\\p{XDigit}+)"; // an exponent is 'e' or 'E' followed by an optionally // signed decimal integer. final String Exp = "[eE][+]?"+Digits; final String fpRegex = ("[\\x00\\x20]*"+ // Optional leading "whitespace" "[+]?(" + // Optional sign character "NaN" + // "NaN" string "Infinity" + // "Infinity" string // A decimal floatingpoint string representing a finite positive // number without a leading sign has at most five basic pieces: // Digits . Digits ExponentPart FloatTypeSuffix // // Since this method allows integeronly strings as input // in addition to strings of floatingpoint literals, the // two subpatterns below are simplifications of the grammar // productions from section 3.10.2 of // The Java Language Specification. // Digits ._opt Digits_opt ExponentPart_opt FloatTypeSuffix_opt "((("+Digits+"(\\.)?("+Digits+"?)("+Exp+")?)"+ // . Digits ExponentPart_opt FloatTypeSuffix_opt "(\\.("+Digits+")("+Exp+")?)"+ // Hexadecimal strings "((" + // 0[xX] HexDigits ._opt BinaryExponent FloatTypeSuffix_opt "(0[xX]" + HexDigits + "(\\.)?)" + // 0[xX] HexDigits_opt . HexDigits BinaryExponent FloatTypeSuffix_opt "(0[xX]" + HexDigits + "?(\\.)" + HexDigits + ")" + ")[pP][+]?" + Digits + "))" + "[fFdD]?))" + "[\\x00\\x20]*");// Optional trailing "whitespace" if (Pattern.matches(fpRegex, myString)) Double.valueOf(myString); // Will not throw NumberFormatException else { // Perform suitable alternative action }
 Parameters:

s
 the string to be parsed.  Returns:
 a
Double
object holding the value represented by theString
argument.  Throws:

NumberFormatException
 if the string does not contain a parsable number.
valueOf
public static Double valueOf(double d)
Returns a Double
instance representing the specified double
value. If a new Double
instance is not required, this method should generally be used in preference to the constructor Double(double)
, as this method is likely to yield significantly better space and time performance by caching frequently requested values.
 Parameters:

d
 a double value.  Returns:
 a
Double
instance representingd
.  Since:
 1.5
parseDouble
public static double parseDouble(String s) throws NumberFormatException
Returns a new double
initialized to the value represented by the specified String
, as performed by the valueOf
method of class Double
.
 Parameters:

s
 the string to be parsed.  Returns:
 the
double
value represented by the string argument.  Throws:

NullPointerException
 if the string is null 
NumberFormatException
 if the string does not contain a parsabledouble
.  Since:
 1.2
 See Also:
valueOf(String)
isNaN
public static boolean isNaN(double v)
Returns true
if the specified number is a NotaNumber (NaN) value, false
otherwise.
 Parameters:

v
 the value to be tested.  Returns:

true
if the value of the argument is NaN;false
otherwise.
isInfinite
public static boolean isInfinite(double v)
Returns true
if the specified number is infinitely large in magnitude, false
otherwise.
 Parameters:

v
 the value to be tested.  Returns:

true
if the value of the argument is positive infinity or negative infinity;false
otherwise.
isFinite
public static boolean isFinite(double d)
Returns true
if the argument is a finite floatingpoint value; returns false
otherwise (for NaN and infinity arguments).
 Parameters:

d
 thedouble
value to be tested  Returns:

true
if the argument is a finite floatingpoint value,false
otherwise.  Since:
 1.8
isNaN
public boolean isNaN()
Returns true
if this Double
value is a NotaNumber (NaN), false
otherwise.
 Returns:

true
if the value represented by this object is NaN;false
otherwise.
isInfinite
public boolean isInfinite()
Returns true
if this Double
value is infinitely large in magnitude, false
otherwise.
 Returns:

true
if the value represented by this object is positive infinity or negative infinity;false
otherwise.
toString
public String toString()
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.
 Overrides:

toString
in classObject
 Returns:
 a
String
representation of this object.  See Also:
toString(double)
byteValue
public byte byteValue()
Returns the value of this Double
as a byte
after a narrowing primitive conversion.
 Overrides:

byteValue
in classNumber
 Returns:
 the
double
value represented by this object converted to typebyte
 Since:
 1.1
shortValue
public short shortValue()
Returns the value of this Double
as a short
after a narrowing primitive conversion.
 Overrides:

shortValue
in classNumber
 Returns:
 the
double
value represented by this object converted to typeshort
 Since:
 1.1
intValue
public int intValue()
Returns the value of this Double
as an int
after a narrowing primitive conversion.
 Specified by:

intValue
in classNumber
 Returns:
 the
double
value represented by this object converted to typeint
longValue
public long longValue()
Returns the value of this Double
as a long
after a narrowing primitive conversion.
 Specified by:

longValue
in classNumber
 Returns:
 the
double
value represented by this object converted to typelong
floatValue
public float floatValue()
Returns the value of this Double
as a float
after a narrowing primitive conversion.
 Specified by:

floatValue
in classNumber
 Returns:
 the
double
value represented by this object converted to typefloat
 Since:
 1.0
doubleValue
public double doubleValue()
Returns the double
value of this Double
object.
 Specified by:

doubleValue
in classNumber
 Returns:
 the
double
value represented by this object
hashCode
public int hashCode()
Returns a hash code 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 hash code is the value of the expression:
(int)(v^(v>>>32))where
v
is defined by: long v = Double.doubleToLongBits(this.doubleValue());
 Overrides:

hashCode
in classObject
 Returns:
 a
hash code
value for this object.  See Also:

Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
hashCode
public static int hashCode(double value)
Returns a hash code for a double
value; compatible with Double.hashCode()
.
 Parameters:

value
 the value to hash  Returns:
 a hash code value for a
double
value.  Since:
 1.8
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 Double
object that represents a double
that has the same value as 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 identical 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
d1.doubleValue() == d2.doubleValue()
also has the value true
. However, there are two exceptions:
 If
d1
andd2
both representDouble.NaN
, then theequals
method returnstrue
, even thoughDouble.NaN==Double.NaN
has the valuefalse
.  If
d1
represents+0.0
whiled2
represents0.0
, or vice versa, theequal
test has the valuefalse
, even though+0.0==0.0
has the valuetrue
.
 Overrides:

equals
in classObject
 Parameters:

obj
 the object to compare with.  Returns:

true
if the objects are the same;false
otherwise.  See Also:
doubleToLongBits(double)
doubleToLongBits
public static long doubleToLongBits(double value)
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 the same as the argument to doubleToLongBits
(except all NaN values are collapsed to a single "canonical" NaN value).
 Parameters:

value
 adouble
precision floatingpoint number.  Returns:
 the bits that represent the floatingpoint number.
doubleToRawLongBits
public static long doubleToRawLongBits(double value)
Returns a representation of the specified floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout, preserving NotaNumber (NaN) values.
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 the long
integer representing the actual NaN value. Unlike the doubleToLongBits
method, doubleToRawLongBits
does not collapse all the bit patterns encoding a NaN to a single "canonical" NaN value.
In all cases, the result is a long
integer that, when given to the longBitsToDouble(long)
method, will produce a floatingpoint value the same as the argument to doubleToRawLongBits
.
 Parameters:

value
 adouble
precision floatingpoint number.  Returns:
 the bits that represent the floatingpoint number.
 Since:
 1.3
longBitsToDouble
public static double longBitsToDouble(long bits)
Returns the double
value corresponding to a given bit representation. The argument is considered to be a representation of a floatingpoint value according to the IEEE 754 floatingpoint "double format" bit layout.
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 a NaN. No IEEE 754 floatingpoint operation provided by Java can distinguish between two NaN values of the same type with different bit patterns. Distinct values of NaN are only distinguishable 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:
int s = ((bits >> 63) == 0) ? 1 : 1; int e = (int)((bits >> 52) & 0x7ffL); long m = (e == 0) ? (bits & 0xfffffffffffffL) << 1 : (bits & 0xfffffffffffffL)  0x10000000000000L;Then the floatingpoint result equals the value of the mathematical expression s·m·2^{e1075}.
Note that this method may not be able to return a double
NaN with exactly same bit pattern as the long
argument. IEEE 754 distinguishes between two kinds of NaNs, quiet NaNs and signaling NaNs. The differences between the two kinds of NaN are generally not visible in Java. Arithmetic operations on signaling NaNs turn them into quiet NaNs with a different, but often similar, bit pattern. However, on some processors merely copying a signaling NaN also performs that conversion. In particular, copying a signaling NaN to return it to the calling method may perform this conversion. So longBitsToDouble
may not be able to return a double
with a signaling NaN bit pattern. Consequently, for some long
values, doubleToRawLongBits(longBitsToDouble(start))
may not equal start
. Moreover, which particular bit patterns represent signaling NaNs is platform dependent; although all NaN bit patterns, quiet or signaling, must be in the NaN range identified above.
 Parameters:

bits
 anylong
integer.  Returns:
 the
double
floatingpoint value with the same bit pattern.
compareTo
public int compareTo(Double anotherDouble)
Compares two Double
objects 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 double
values:

Double.NaN
is considered by this method to be equal to itself and greater than all otherdouble
values (includingDouble.POSITIVE_INFINITY
). 
0.0d
is considered by this method to be greater than0.0d
.
Double
objects imposed by this method is consistent with equals.  Specified by:

compareTo
in interfaceComparable<Double>
 Parameters:

anotherDouble
 theDouble
to be compared.  Returns:
 the value
0
ifanotherDouble
is numerically equal to thisDouble
; a value less than0
if thisDouble
is numerically less thananotherDouble
; and a value greater than0
if thisDouble
is numerically greater thananotherDouble
.  Since:
 1.2
compare
public static int compare(double d1, double d2)
Compares the two specified double
values. The sign of the integer value returned is the same as that of the integer that would be returned by the call:
new Double(d1).compareTo(new Double(d2))
 Parameters:

d1
 the firstdouble
to compare 
d2
 the seconddouble
to compare  Returns:
 the value
0
ifd1
is numerically equal tod2
; a value less than0
ifd1
is numerically less thand2
; and a value greater than0
ifd1
is numerically greater thand2
.  Since:
 1.4
sum
public static double sum(double a, double b)
Adds two double
values together as per the + operator.
 Parameters:

a
 the first operand 
b
 the second operand  Returns:
 the sum of
a
andb
 Since:
 1.8
 See Also:
BinaryOperator
max
public static double max(double a, double b)
Returns the greater of two double
values as if by calling Math.max
.
 Parameters:

a
 the first operand 
b
 the second operand  Returns:
 the greater of
a
andb
 Since:
 1.8
 See Also:
BinaryOperator
min
public static double min(double a, double b)
Returns the smaller of two double
values as if by calling Math.min
.
 Parameters:

a
 the first operand 
b
 the second operand  Returns:
 the smaller of
a
andb
.  Since:
 1.8
 See Also:
BinaryOperator