THE PACKAGE JAVA.LANG

java.lang.Double

20.10

20.10.13

public float floatValue()

The

double

 value represented by this

Double

 object is converted ( 5.1.3) to type

float

 and the result of the conversion is returned.

Overrides the

floatValue

 method of

Number

 ( 20.6.3).

20.10.14

public double doubleValue()

The

double

 value represented by this

Double

 object is returned.

Overrides the

doubleValue

 method of

Number

 ( 20.6.4).

20.10.15

public static String toString(double d)

The argument is converted to a readable string format as follows. 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 (abso 

lute 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

:

N

If

m

 is infinity, it is represented by the characters

"Infinity"

; thus, posi 

tive infinity produces the result

"Infinity"

 and negative infinity produces

the result

" Infinity"

.

N

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"

.

N

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

.

N

If

m

 is less than 10

3

 or not less than 10

7

, then it is represented in so called

 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 deci 

mal digits representing the fractional part of

a

, followed by the letter

 E 

(

\u0045

), followed by a representation of

n

 as a decimal integer, as pro 

duced by the method

Integer.toString

 of one argument ( 20.7.12).

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