Serializable, Comparable<Double>, Constable, ConstantDesc
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.
This is a value-based class; programmers should treat instances that are equal as interchangeable and should not use instances for synchronization, or unpredictable behavior may occur. For example, in a future release, synchronization may fail.
Floating-point Equality, Equivalence, and ComparisonIEEE 754 floating-point values include finite nonzero values, signed zeros (
+0.0
and
-0.0
), signed infinities (
positive infinityand
negative infinity), and
NaN(not-a-number).
An equivalence relation on a set of values is a boolean relation on pairs of values that is reflexive, symmetric, and transitive. For more discussion of equivalence relations and object equality, see the Object.equals specification. An equivalence relation partitions the values it operates over into sets called equivalence classes. All the members of the equivalence class are equal to each other under the relation. An equivalence class may contain only a single member. At least for some purposes, all the members of an equivalence class are substitutable for each other. In particular, in a numeric expression equivalent values can be substituted for one another without changing the result of the expression, meaning changing the equivalence class of the result of the expression.
Notably, the built-in == operation on floating-point values is not an equivalence relation. Despite not defining an equivalence relation, the semantics of the IEEE 754 == operator were deliberately designed to meet other needs of numerical computation. There are two exceptions where the properties of an equivalence relation are not satisfied by == on floating-point values:
v1 and v2 are both NaN, then v1 == v2 has the value false. Therefore, for two NaN arguments the reflexive property of an equivalence relation is not satisfied by the == operator.v1 represents +0.0 while v2 represents -0.0, or vice versa, then v1 == v2 has the value true even though +0.0 and -0.0 are distinguishable under various floating-point operations. For example, 1.0/+0.0 evaluates to positive infinity while 1.0/-0.0 evaluates to negative infinity and positive infinity and negative infinity are neither equal to each other nor equivalent to each other. Thus, while a signed zero input most commonly determines the sign of a zero result, because of dividing by zero, +0.0 and -0.0 may not be substituted for each other in general. The sign of a zero input also has a non-substitutable effect on the result of some math library methods.For ordered comparisons using the built-in comparison operators (<, <=, etc.), NaN values have another anomalous situation: a NaN is neither less than, nor greater than, nor equal to any value, including itself. This means the trichotomy of comparison does not hold.
To provide the appropriate semantics for equals and compareTo methods, those methods cannot simply be wrappers around == or ordered comparison operations. Instead, equals uses representation equivalence, defining NaN arguments to be equal to each other, restoring reflexivity, and defining +0.0 to not be equal to -0.0. For comparisons, compareTo defines a total order where -0.0 is less than +0.0 and where a NaN is equal to itself and considered greater than positive infinity.
The operational semantics of equals and compareTo are expressed in terms of bit-wise converting the floating-point values to integral values.
The natural ordering implemented by compareTo is consistent with equals. That is, two objects are reported as equal by equals if and only if compareTo on those objects returns zero.
The adjusted behaviors defined for equals and compareTo allow instances of wrapper classes to work properly with conventional data structures. For example, defining NaN values to be equals to one another allows NaN to be used as an element of a HashSet or as the key of a HashMap. Similarly, defining compareTo as a total ordering, including +0.0, -0.0, and NaN, allows instances of wrapper classes to be used as elements of a SortedSet or as keys of a SortedMap.
Comparing numerical equality to various useful equivalence relations that can be defined over floating-point values:
== operator): (Not an equivalence relation)
+0.0 and -0.0 are equal since they both map to the same real value, 0. A NaN does not map to any real number and is not equal to any value, including itself.
double values a and b is implemented by the expression
Double.doubleToRawLongBits(a) == Double.doubleToRawLongBits(b)
+0.0 and -0.0 are distinguished from each other and every bit pattern encoding a NaN is distinguished from every other bit pattern encoding a NaN.
+0.0 and -0.0 are distinguished from each other.Double.doubleToLongBits(a) == Double.doubleToLongBits(b)Double.valueOf(a).equals(Double.valueOf(b))Double.compare(a, b) == 0For two binary floating-point values
a
and
b
, if neither of
a
and
b
is zero or NaN, then the three relations numerical equality, bit-wise equivalence, and representation equivalence of
a
and
b
have the same
true
/
false
value. In other words, for binary floating-point values, the three relations only differ if at least one argument is zero or NaN.
<, <=, >, and >=
Fields
static final int
The number of bytes used to represent a double value.
static final int
Maximum exponent a finite double variable may have.
static final double
A constant holding the largest positive finite value of type double, (2-2-52)·21023.
static final int
Minimum exponent a normalized double variable may have.
static final double
A constant holding the smallest positive normal value of type double, 2-1022.
static final double
A constant holding the smallest positive nonzero value of type double, 2-1074.
static final double
A constant holding a Not-a-Number (NaN) value of type double.
static final double
A constant holding the negative infinity of type double.
static final double
A constant holding the positive infinity of type double.
static final int
The number of bits in the significand of a double value.
static final int
The number of bits used to represent a double value.
The Class instance representing the primitive type double.
Constructors
Deprecated, for removal: This API element is subject to removal in a future version. Deprecated, for removal: This API element is subject to removal in a future version.byte
Returns the value of this Double as a byte after a narrowing primitive conversion.
static int
Compares the two specified double values.
int
Compares two Double objects numerically.
Returns an
Optional
containing the nominal descriptor for this instance, which is the instance itself.
static long
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout.
static long
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, preserving Not-a-Number (NaN) values.
double
Returns the double value of this Double object.
boolean
Compares this object against the specified object.
float
Returns the value of this Double as a float after a narrowing primitive conversion.
int
Returns a hash code for this Double object.
static int
Returns a hash code for a double value; compatible with Double.hashCode().
int
Returns the value of this Double as an int after a narrowing primitive conversion.
static boolean
Returns true if the argument is a finite floating-point value; returns false otherwise (for NaN and infinity arguments).
boolean
Returns true if this Double value is infinitely large in magnitude, false otherwise.
static boolean
Returns true if the specified number is infinitely large in magnitude, false otherwise.
boolean
Returns true if this Double value is a Not-a-Number (NaN), false otherwise.
static boolean
Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.
static double
Returns the double value corresponding to a given bit representation.
long
Returns the value of this Double as a long after a narrowing primitive conversion.
static double
Returns the greater of two
double
values as if by calling
Math.max
.
static double
Returns the smaller of two
double
values as if by calling
Math.min
.
static double
Returns a new double initialized to the value represented by the specified String, as performed by the valueOf method of class Double.
Resolves this instance as a
ConstantDesc
, the result of which is the instance itself.
short
Returns the value of this Double as a short after a narrowing primitive conversion.
static double
Adds two double values together as per the + operator.
Returns a hexadecimal string representation of the double argument.
Returns a string representation of this Double object.
Returns a string representation of the double argument.
Returns a Double instance representing the specified double value.
Returns a Double object holding the double value represented by the argument string s.
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).
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).
public static final double NaN
A constant holding a Not-a-Number (NaN) value of type double. It is equivalent to the value returned by Double.longBitsToDouble(0x7ff8000000000000L).
public static final double MAX_VALUE
A constant holding the largest positive finite value of type double, (2-2-52)·21023. It is equal to the hexadecimal floating-point literal 0x1.fffffffffffffP+1023 and also equal to Double.longBitsToDouble(0x7fefffffffffffffL).
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 floating-point literal 0x1.0p-1022 and also equal to Double.longBitsToDouble(0x0010000000000000L).
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 floating-point literal 0x0.0000000000001P-1022 and also equal to Double.longBitsToDouble(0x1L).
public static final int SIZE
The number of bits used to represent a double value.
public static final int PRECISION
The number of bits in the significand of a
double
value. This is the parameter N in section
4.2.3of
The Java Language Specification.
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).
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).
public static final int BYTES
The number of bytes used to represent a double value.
The Class instance representing the primitive type double.
Constructs a newly allocated Double object that represents the primitive double argument.
value - the value to be represented by the Double.
Constructs a newly allocated 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.
NumberFormatException - if the string does not contain a parsable number.
Returns a string representation of the
double
argument. All characters mentioned below are ASCII characters.
NaN".-' ('\u002D'); 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".A decimal is a number of the form s×10i for some (unique) integers s > 0 and i such that s is not a multiple of 10. These integers are the significand and the exponent, respectively, of the decimal. The length of the decimal is the (unique) positive integer n meeting 10n-1 ≤ s < 10n.
The decimal dm for a finite positive m is defined as follows:
The (uniquely) selected decimal dm is then formatted. Let s, i and n be the significand, exponent and length of dm, respectively. Further, let e = n + i - 1 and let s1…sn be the usual decimal expansion of s. Note that s1 ≠ 0 and sn ≠ 0. Below, the decimal point '.' is '\u002E' and the exponent indicator 'E' is '\u0045'.
0.0…0s1…sn, where there are exactly -(n + i) zeroes between the decimal point and s1. For example, 123 × 10-4 is formatted as 0.0123.0…0.0, where there are exactly i zeroes between sn and the decimal point. For example, 123 × 102 is formatted as 12300.0..sn+i+1…sn, where there are exactly -i digits to the right of the decimal point. For example, 123 × 10-1 is formatted as 12.3.Integer.toString(int).
.0Ee. For example, 1 × 1023 is formatted as 1.0E23..s2…snEe. For example, 123 × 10-21 is formatted as 1.23E-19.To create localized string representations of a floating-point value, use subclasses of NumberFormat.
d - the double to be converted.
Returns a hexadecimal string representation of the
double
argument. All characters mentioned below are ASCII characters.
NaN".-' ('\u002D'); 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"."0x0.0p0"; thus, negative zero produces the result "-0x0.0p0" and positive zero produces the result "0x0.0p0".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 to Integer.toString on the exponent value.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 "p-1022". Note that there must be at least one nonzero digit in a subnormal significand.1.0 0x1.0p0 -1.0 -0x1.0p0 2.0 0x1.0p1 3.0 0x1.8p1 0.5 0x1.0p-1 0.25 0x1.0p-2 Double.MAX_VALUE 0x1.fffffffffffffp1023 Minimum Normal Value 0x1.0p-1022 Maximum Subnormal Value 0x0.fffffffffffffp-1022 Double.MIN_VALUE 0x0.0000000000001p-1022
d - the double to be converted.
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:
- FloatValue:
- Signopt
NaN- Signopt
Infinity- Signopt FloatingPointLiteral
- Signopt HexFloatingPointLiteral
- SignedInteger
- HexFloatingPointLiteral:
- HexSignificand BinaryExponent FloatTypeSuffixopt
- HexSignificand:
- HexNumeral
- HexNumeral
.0xHexDigitsopt.HexDigits0XHexDigitsopt.HexDigits
- BinaryExponent:
- BinaryExponentIndicator SignedInteger
- BinaryExponentIndicator:
pP
where
Sign,
FloatingPointLiteral,
HexNumeral,
HexDigits,
SignedIntegerand
FloatTypeSuffixare as defined in the lexical structure sections of
The Java Language Specification, except that underscores are not accepted between digits. If
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 round-to-nearest rule of IEEE 754 floating-point arithmetic, which includes preserving the sign of a zero value. Note that the round-to-nearest 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 floating-point value, use subclasses of NumberFormat.
Note that trailing format specifiers, specifiers that determine the type of a floating-point 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 floating-point type. The two-step 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 floating-point 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 floating-point string representing a finite positive
// number without a leading sign has at most five basic pieces:
// Digits . Digits ExponentPart FloatTypeSuffix
//
// Since this method allows integer-only strings as input
// in addition to strings of floating-point literals, the
// two sub-patterns 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
}
s - the string to be parsed.
Double object holding the value represented by the String argument.
NumberFormatException - if the string does not contain a parsable number.
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.
d - a double value.
Double instance representing d.
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.
double value represented by the string argument.
NullPointerException - if the string is null
NumberFormatException - if the string does not contain a parsable double.
public static boolean isNaN(double v)
Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.
v - the value to be tested.
true if the value of the argument is NaN; false otherwise.
public static boolean isInfinite(double v)
Returns true if the specified number is infinitely large in magnitude, false otherwise.
v - the value to be tested.
true if the value of the argument is positive infinity or negative infinity; false otherwise.
public static boolean isFinite(double d)
Returns true if the argument is a finite floating-point value; returns false otherwise (for NaN and infinity arguments).
d - the double value to be tested
true if the argument is a finite floating-point value, false otherwise.
public boolean isNaN()
Returns true if this Double value is a Not-a-Number (NaN), false otherwise.
true if the value represented by this object is NaN; false otherwise.
public boolean isInfinite()
Returns true if this Double value is infinitely large in magnitude, false otherwise.
true if the value represented by this object is positive infinity or negative infinity; false otherwise.
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.
public byte byteValue()
Returns the value of this Double as a byte after a narrowing primitive conversion.
byteValue in class Number
double value represented by this object converted to type byte
public short shortValue()
Returns the value of this Double as a short after a narrowing primitive conversion.
shortValue in class Number
double value represented by this object converted to type short
public int intValue()
Returns the value of this Double as an int after a narrowing primitive conversion.
intValue in class Number
double value represented by this object converted to type int
public long longValue()
Returns the value of this Double as a long after a narrowing primitive conversion.
longValue in class Number
double value represented by this object converted to type long
public float floatValue()
Returns the value of this Double as a float after a narrowing primitive conversion.
floatValue in class Number
double value represented by this object converted to type float
public double doubleValue()
Returns the double value of this Double object.
doubleValue in class Number
double value represented by this object
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());
public static int hashCode(double value)
Returns a hash code for a double value; compatible with Double.hashCode().
value - the value to hash
double value.
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.
equals in class Object
doubleToLongBits(double) rather than the == operator on double values since the == operator does not define an equivalence relation and to satisfy the equals contract an equivalence relation must be implemented; see this discussion for details of floating-point equality and equivalence.
obj - the reference object with which to compare.
true if this object is the same as the obj argument; false otherwise.
public static long doubleToLongBits(double value)
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout.
Bit 63 (the bit that is selected by the mask 0x8000000000000000L) represents the sign of the floating-point number. Bits 62-52 (the bits that are selected by the mask 0x7ff0000000000000L) represent the exponent. Bits 51-0 (the bits that are selected by the mask 0x000fffffffffffffL) represent the significand (sometimes called the mantissa) of the floating-point 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 floating-point value the same as the argument to doubleToLongBits (except all NaN values are collapsed to a single "canonical" NaN value).
value - a double precision floating-point number.
public static long doubleToRawLongBits(double value)
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, preserving Not-a-Number (NaN) values.
Bit 63 (the bit that is selected by the mask 0x8000000000000000L) represents the sign of the floating-point number. Bits 62-52 (the bits that are selected by the mask 0x7ff0000000000000L) represent the exponent. Bits 51-0 (the bits that are selected by the mask 0x000fffffffffffffL) represent the significand (sometimes called the mantissa) of the floating-point 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 floating-point value the same as the argument to doubleToRawLongBits.
value - a double precision floating-point number.
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 floating-point value according to the IEEE 754 floating-point "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 floating-point 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 floating-point result equals the value of the mathematical expression
s·
m·2
e-1075.
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.
bits - any long integer.
double floating-point value with the same bit pattern.
Compares two
Double
objects numerically. This method imposes a total order on
Double
objects with two differences compared to the incomplete order defined by the Java language numerical comparison operators (
<, <=, ==, >=, >
) on
double
values.
Double.NaN to be equal to itself and greater than all other double values (including Double.POSITIVE_INFINITY).+0.0d), to be greater than negative zero (-0.0d).This ensures that the
natural orderingof
Double
objects imposed by this method is
consistent with equals; see
this discussionfor details of floating-point comparison and ordering.
compareTo in interface Comparable<Double>
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.
<, <=, >, and >=
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:
Double.valueOf(d1).compareTo(Double.valueOf(d2))
d1 - the first double to compare
d2 - the second double to compare
0 if d1 is numerically equal to d2; a value less than 0 if d1 is numerically less than d2; and a value greater than 0 if d1 is numerically greater than d2.
public static double sum(double a, double b)
Adds two double values together as per the + operator.
a - the first operand
b - the second operand
a and b
public static double max(double a, double b)
Returns the greater of two
double
values as if by calling
Math.max
.
a - the first operand
b - the second operand
a and b
public static double min(double a, double b)
Returns the smaller of two
double
values as if by calling
Math.min
.
a - the first operand
b - the second operand
a and b.
Returns an
Optional
containing the nominal descriptor for this instance, which is the instance itself.
describeConstable in interface Constable
Optional describing the Double instance
Resolves this instance as a
ConstantDesc
, the result of which is the instance itself.
resolveConstantDesc in interface ConstantDesc
lookup - ignored
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