Double (Java 2 Platform SE 5.0)

Por favor, lembre-se que esta tradução da especificação é resultado de um projeto da comunidade java.net( https://jdk5-api-pt-br.dev.java.net/). A versão oficial da especificação é a versão na língua inglesa que pode ser encontrada em http://java.sun.com/j2se/1.5.0/docs/api/. Em caso de divergências, a versão predominante da especificação é a original em inglês.

Please note that this translation of the specification is the result of a java.net community project ( https://jdk5-api-pt-br.dev.java.net/ ). The official version of the specification is the US English language version which can be found at http://java.sun.com/j2se/1.5.0/docs/api/. In case of disputes, the authoritative version of the specification is the original, English document.

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Java^TM 2 Platform
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java.lang
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>
extends Number
implements Comparable<Double>

A classe Double empacota um valor do tipo primitivo double em um objeto. Um objeto do tipo Double contem um único campo cujo tipo é double.

Adicionalmente, essa classe provê vários métodos para converter um double para uma String e uma String para um double, bem como outras constantes e métodos úteis ao lidar com double.

Since:: JDK1.0
See Also:: Serialized Form

Field Summary
`static double`	`MAX_VALUE` Uma constante que armazena o maior valor positivo finito do tipo `double`, (2-2^-52)·2¹⁰²³.
`static double`	`MIN_VALUE` Uma constante que armazena o menor valor positivo não-zero do tipo `double`, 2^-1074.
`static double`	`NaN` Uma constante que armazena um valor Not-a-Number (NaN) do tipo `double`.
`static double`	`NEGATIVE_INFINITY` Uma constante que armazena o infinito negativo do tipo `double`.
`static double`	`POSITIVE_INFINITY` Uma constante que armazena o infinito positivo do tipo `double`.
`static int`	`SIZE` O número de bits utilizados para representar um valor do tipo `double`.
`static Class<Double>`	`TYPE` A instância de `Class` que representa o tipo primitivo `double`.

Constructor Summary
`Double(double value)` Constrói um objeto `Double` recém-alocado que representa o argumento primitivo `double`.
`Double(String s)` Constrói um objeto `Double` recém-alocado que representa o valor ponto-flutuante do tipo `double` representando pela string.

Method Summary
`byte`	`byteValue()` Returns the value of this `Double` as a `byte` (by casting to a `byte`).
`static int`	`compare(double d1, double d2)` Compares the two specified `double` values.
`int`	`compareTo(Double anotherDouble)` Compares two `Double` objects numerically.
`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.
`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.
`double`	`doubleValue()` Returns the `double` value of this `Double` object.
`boolean`	`equals(Object obj)` Compares this object against the specified object.
`float`	`floatValue()` Returns the `float` value of this `Double` object.
`int`	`hashCode()` Returns a hash code for this `Double` object.
`int`	`intValue()` Returns the value of this `Double` as an `int` (by casting to type `int`).
`boolean`	`isInfinite()` Returns `true` if this `Double` value is infinitely large in magnitude, `false` otherwise.
`static boolean`	`isInfinite(double v)` Returns `true` if the specified number is infinitely large in magnitude, `false` otherwise.
`boolean`	`isNaN()` Returns `true` if this `Double` value is a Not-a-Number (NaN), `false` otherwise.
`static boolean`	`isNaN(double v)` Returns `true` if the specified number is a Not-a-Number (NaN) value, `false` otherwise.
`static double`	`longBitsToDouble(long bits)` Returns the `double` value corresponding to a given bit representation.
`long`	`longValue()` Returns the value of this `Double` as a `long` (by casting to type `long`).
`static double`	`parseDouble(String s)` Returns a new `double` initialized to the value represented by the specified `String`, as performed by the `valueOf` method of class `Double`.
`short`	`shortValue()` Returns the value of this `Double` as a `short` (by casting to a `short`).
`static String`	`toHexString(double d)` Retorna uma representação em string hexadecimal do argumento `double`.
`String`	`toString()` Returns a string representation of this `Double` object.
`static String`	`toString(double d)` Retorna uma representação em string do argumento `double`.
`static Double`	`valueOf(double d)` Returns a `Double` instance representing the specified `double` value.
`static Double`	`valueOf(String s)` Returns a `Double` object holding the `double` value represented by the argument string `s`.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

POSITIVE_INFINITY

public static final double POSITIVE_INFINITY

Uma constante que armazena o infinito positivo do tipo double. É igual ao valor retornado por Double.longBitsToDouble(0x7ff0000000000000L).

See Also:: Constant Field Values

NEGATIVE_INFINITY

public static final double NEGATIVE_INFINITY

Uma constante que armazena o infinito negativo do tipo double. É igual ao valor retornado por Double.longBitsToDouble(0xfff0000000000000L).

See Also:: Constant Field Values

NaN

public static final double NaN

Uma constante que armazena um valor Not-a-Number (NaN) do tipo double. É equivalente ao valor retornado por Double.longBitsToDouble(0x7ff8000000000000L).

See Also:: Constant Field Values

MAX_VALUE

public static final double MAX_VALUE

Uma constante que armazena o maior valor positivo finito do tipo double, (2-2^-52)·2¹⁰²³. É igual ao literal hexadecimal de ponto-flutuante 0x1.fffffffffffffP+1023 e também igual a Double.longBitsToDouble(0x7fefffffffffffffL).

See Also:: Constant Field Values

MIN_VALUE

public static final double MIN_VALUE

Uma constante que armazena o menor valor positivo não-zero do tipo double, 2^-1074. É igual ao literal hexadecimal de ponto-flutuante 0x0.0000000000001P-1022 e também igual a Double.longBitsToDouble(0x1L).

See Also:: Constant Field Values

SIZE

public static final int SIZE

O número de bits utilizados para representar um valor do tipo double.

Since:: 1.5
See Also:: Constant Field Values

TYPE

public static final Class<Double> TYPE

A instância de Class que representa o tipo primitivo double.

Since:: JDK1.1

Constructor Detail

Double

public Double(double value)

Constrói um objeto Double recém-alocado que representa o argumento primitivo double.

Parameters:: value - o valor representado pelo Double.

Double

public Double(String s)
       throws NumberFormatException

Constrói um objeto Double recém-alocado que representa o valor ponto-flutuante do tipo double representando pela string. A string é convertida para um valor double como se fosse o método valueOf.

Parameters:: s - uma string a ser convertida para um Double.
Throws:: NumberFormatException - se a string não possui um número conversível.
See Also:: valueOf(java.lang.String)

Method Detail

toString

public static String toString(double d)

Retorna uma representação em string do argumento double. Todos os caracteres mencionados abaixo são ASCII.

Se o argumento é Not-a-Number (NaN), o resultado é a string "NaN".
Caso contrário, o resultado é uma string que representa o sinal e a magnitude (valor absoluto) do argumento. Se o sinal é negativo, o primeiro caractere do resultado é '-' ('\u002D'); Se o sinal é positivo, nenhum caractere de sinal aparece no resultado. Para a magnitude m:
- Se m é infinito, é representado pela string "Infinity"; então, infinito positivo resulta em "Infinity" e o positivo infinito resulta em "-Infinity".
- Se m é zero, é representado pela string "0.0"; então, zero negativo resulta em "-0.0" e zero positivo resulta em "0.0".
- Se m é maior ou igual a 10^-3 mas menor que 10⁷, é representado como a parte inteira de m, na forma decimal sem LEADING ZEROES, seguido por '.' ('\u002E'), seguido por um ou mais dígitos decimais representando a parte fracional de m.
- Se m é menor que 10^-3 ou maior ou igual a 10⁷, então é representado pela chamada "notação científica computadorizada." Seja n um único inteiro tal que 10ⁿ <= m < 10ⁿ⁺¹; seja a o quociente matematicamente exato de m e 10ⁿ tal qual 1 <= a < 10. A magnitude é então representada como a parte inteira de a, como um único dígito decimal, seguido pelo '.' ('\u002E'), seguido pelos dígitos decimais representando a parte fracional de a, seguido pela letra 'E' ('\u0045'), seguido por uma representação de n como um inteiro decimal, como produzido pelo método Integer.toString(int).

Quantos dígitos devem ser impressos para a parte fracional de m ou a? Deve haver ao menos um dígito para representar a parte fracional, e além disso, tantos quantos forem necessários para distiguir o valor do argumento de outros valores adjacentes do tipo double. Isso é, supondo que x é o valor matemático exato da representação produzida por esse método para um argumento d finito e diferente de zero. Então d deve ser o valor double mais próximo de x; ou se dois valores de double são igualmente próximos de x, então d deve ser um deles e o bit menos significante da significância de d deve ser 0.

Para criar representações localizadas em string, de um valor de ponto-flutuante, use uma sub-classe NumberFormat.

Parameters:: d - o double a ser convertido.
Returns:: uma string representando o argumento especificado.

toHexString

public static String toHexString(double d)

Retorna uma representação em string hexadecimal do argumento double. Todos os caracteres mencionados abaixo são padrão ASCII.

Se o argumento for um número inválido (NaN), o resultado é a string "NaN".
Caso contrário, o resultado é uma string que representa o sinal e a magnitude do argumento. Se o sinal é negativo, o primeiro caractere do resultado é '-' ('\u002D'); se o sinal é positivo, nenhum caractere aparece no resultado. Para uma magnitude m:
- Se m é inifinito, é representado pela string "Infinity"; Portanto, infinito positivo produz o resultado "Infinity" enquanto o infinito negativo produz o resultado "-Infinity".
- Se m é zero, é representado pela string "0x0.0p0"; portanto, zero negativo produz o resultado "-0x0.0p0" e zero positivo produz o resultado "0x0.0p0". //--------------------------------------------------------------------- // 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. // //
- 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 // "p-1022". Note that there must be at // least one nonzero digit in a subnormal significand. // //
//---------------------------------------------------------------------

Exemplos
Valores de ponto-flutuante	String Hexadecimal
`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`
`Valor Normal Mínimo`	`0x1.0p-1022`
`Valor Máximo Subnormal`	`0x0.fffffffffffffp-1022`
`Double.MIN_VALUE`	`0x0.0000000000001p-1022`

Parameters:: d - o double a ser convertido.
Returns:: uma string hexadecimal representando o argumento.
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:

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 . HexDigits
0X HexDigits_opt . HexDigits

BinaryExponent:
BinaryExponentIndicator SignedInteger

BinaryExponentIndicator:
p
P

where Sign, FloatingPointLiteral, HexNumeral, HexDigits, SignedInteger and FloatTypeSuffix are as defined in the lexical structure sections of the of the Java Language Specification. 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. Finally, 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 a 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 the Java Language Specification, 2nd 
             // edition, section 3.10.2.

             // 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 the String 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 representing d.
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:: NumberFormatException - if the string does not contain a parsable double.
Since:: 1.2
See Also:: valueOf(String)

isNaN

public static boolean isNaN(double v)

Returns true if the specified number is a Not-a-Number (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.

isNaN

public boolean isNaN()

Returns true if this Double value is a Not-a-Number (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 class Object

Returns:: a String representation of this object.
See Also:: toString(double)

byteValue

public byte byteValue()

Returns the value of this Double as a byte (by casting to a byte).

Overrides:: byteValue in class Number

Returns:: the double value represented by this object converted to type byte
Since:: JDK1.1

shortValue

public short shortValue()

Returns the value of this Double as a short (by casting to a short).

Overrides:: shortValue in class Number

Returns:: the double value represented by this object converted to type short
Since:: JDK1.1

intValue

public int intValue()

Returns the value of this Double as an int (by casting to type int).

Specified by:: intValue in class Number

Returns:: the double value represented by this object converted to type int

longValue

public long longValue()

Returns the value of this Double as a long (by casting to type long).

Specified by:: longValue in class Number

Returns:: the double value represented by this object converted to type long

floatValue

public float floatValue()

Returns the float value of this Double object.

Specified by:: floatValue in class Number

Returns:: the double value represented by this object converted to type float
Since:: JDK1.0

doubleValue

public double doubleValue()

Returns the double value of this Double object.

Specified by:: doubleValue in class Number

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 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 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 and d2 both represent Double.NaN, then the equals method returns true, even though Double.NaN==Double.NaN has the value false.
If 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 definition allows hash tables to operate properly.

Overrides:: equals in class Object

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 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).

Parameters:: value - a double precision floating-point number.
Returns:: the bits that represent the floating-point number.

doubleToRawLongBits

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.

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.

Parameters:: value - a double precision floating-point number.
Returns:: the bits that represent the floating-point number.

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 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.

Parameters:: bits - any long integer.
Returns:: the double floating-point 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 other double values (including Double.POSITIVE_INFINITY).
0.0d is considered by this method to be greater than -0.0d.

This ensures that the natural ordering of Double objects imposed by this method is consistent with equals.

Specified by:: compareTo in interface Comparable<Double>

Parameters:: anotherDouble - the Double to be compared.
Returns:: the value 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.
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 - o primeiro double a ser comparado; d2 - o segundo double a ser comparado
Returns:: o valor 0 se d1 é numericamente igual a d2; um valor menor que 0 0 se d1 é numericamente menor que d2; e um valor maior que 0 se d1 é numericamente maior que d2.
Since:: 1.4

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java.lang Class Double

POSITIVE_INFINITY

NEGATIVE_INFINITY

NaN

MAX_VALUE

MIN_VALUE

SIZE

TYPE

Double

Double

toString

toHexString

Exemplos

valueOf

valueOf

parseDouble

isNaN

isInfinite

isNaN

isInfinite

toString

byteValue

shortValue

intValue

longValue

floatValue

doubleValue

hashCode

equals

doubleToLongBits

doubleToRawLongBits

longBitsToDouble

compareTo

compare

java.lang
Class Double