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public  final  class  java.lang.Double
    extends  java.lang.Number  (I-§1.11)
{
        // Fields
    public final static double MAX_VALUE;	§1.6.1
    public final static double MIN_VALUE;	§1.6.2
    public final static double NaN;	§1.6.3
    public final static double NEGATIVE_INFINITY;	§1.6.4
    public final static double POSITIVE_INFINITY;	§1.6.5

        // Constructors
    public Double(double  value);	§1.6.6
    public Double(String  s);	§1.6.7

        // Methods
    public static long doubleToLongBits(double  value);	§1.6.8
    public double doubleValue();	§1.6.9
    public boolean equals(Object  obj);	§1.6.10
    public float floatValue();	§1.6.11
    public int hashCode();	§1.6.12
    public int intValue();	§1.6.13
    public boolean isInfinite();	§1.6.14
    public static boolean isInfinite(double  v);	§1.6.15
    public boolean isNaN();	§1.6.16
    public static boolean isNaN(double  v);	§1.6.17
    public static double longBitsToDouble(long  bits);	§1.6.18
    public long longValue();	§1.6.19
    public String toString();	§1.6.20
    public static String toString(double  d);	§1.6.21
    public static Double valueOf(String  s);	§1.6.22
}

In addition, this class provides a number of 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.

The largest positive value of type double.

The smallest positive finite value of type double.

A Not-a-Number value of type double.

The negative infinity of type double.

The positive infinity of type double.

Constructs a newly allocated Double object that represents the primitive double argument.

Parameters:

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 (I-§1.6.22).

Parameters:

s - a string to be converted to a Double

Throws

NumberFormatException (I-§1.41)

If the string does not contain a parsable number.

The result is a representation of the floating-point argument according to the IEEE 754 floating-point "double format" bit layout.

Bit 63 represents the sign of the floating-point number. Bits 62-52 represent the exponent. Bits 51-0 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.

Parameters:

value - a double precision floating point number

Returns:

the bits that represent the floating point number.

Returns:

the double value represented by this object.

Overrides:

doubleValue in class Number (I-§1.11.1).

The result is true if and only if the argument is not null and is a Double object that represents a double that has the identical bit pattern to the bit pattern of the double represented by this object.

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.longValue()
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.

Parameters:

obj - the object to compare with

Returns:

true if the objects are the same; false otherwise.

Overrides:

equals in class Object (I-§1.12.3).

Returns:

the double value represented by this object is converted to type float and the result of the conversion is returned.

Overrides:

floatValue in class Number (I-§1.11.2).

Returns:

a hash code value for this object.

Overrides:

hashCode in class Object (I-§1.12.6).

Returns:

the double value represented by this object is converted to type int and the result of the conversion is returned.

Overrides:

intValue in class Number (I-§1.11.3).

Returns:

true if the value represented by this object is positive infinity (I-§1.6.5) or negative infinity (I-§1.6.4); false otherwise.

Parameters:

v - the value to be tested

Returns:

true if the value of the argument is positive infinity (I-§1.6.5) or negative infinity (I-§1.6.4); false otherwise.

Returns:

true if the value represented by this object is NaN (I-§1.6.3); false otherwise.

Parameters:

v - the value to be tested

Returns:

true if the value of the argument is NaN (I-§1.6.3); false otherwise.

The argument is considered to be a representation of a floating-point value according to the IEEE 754 floating-point "double precision" bit layout. That floating-point value is returned as the result.

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.

Parameters:

bits - any long integer

Returns:

the double floating-point value with the same bit pattern.

Returns:

the double value represented by this object is converted to type long and the result of the conversion is returned.

Overrides:

longValue in class Number (I-§1.11.4).

The primitive double value represented by this object is converted to a string exactly as if by the method toString of one argument (I-§1.6.21).

Returns:

a String representation of this object.

Overrides:

toString in class Object (I-§1.12.9).

Creates a string representation of the 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 , 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.

Warning to editor: I want a plus/minus symbol before the xx in the previous line. For some reason, some printers aren't printing itit. I don't completely understand

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.

Parameters:

d - the double to be converted

Returns:

a string representation of the argument.

Parses a string into a Double.

Parameters:

s - the string to be parsed

Returns:

a newly constructed Double initialized to the value represented by the string argument..

Throws

NumberFormatException (I-§1.41)

If the string does not contain a parsable number.

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