THE PACKAGE JAVA.LANG

java.lang.Double

20.10

20.10.18

public static boolean isNaN(double v)

The result is

true

 if and only if the value of the argument is NaN.

20.10.19

public boolean isInfinite()

The result is

true

 if and only if the value represented by this

Double

 object is

positive infinity or negative infinity.

20.10.20

public static boolean isInfinite(double v)

The result is

true

 if and only if the value of the argument is positive infinity or

negative infinity.

20.10.21

public static long doubleToLongBits(double value)

The result is a representation of the floating point argument according to the IEEE

754 floating point  double format  bit layout:

Bit 63 (the bit that is selected by the mask

0x8000000000000000L

) repre 

sents 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

) rep 

resent the significand (sometimes called the mantissa) of the floating point

number.

If the argument is positive infinity, the result will be

0x7ff0000000000000L

.

If the argument is negative infinity, the result will be

0xfff0000000000000L

.

If the argument is NaN, the result will be

0x7ff8000000000000L

.

In all cases, the result is a

long

 integer that, when given to the

longBitsToDouble

method ( 20.10.22), will produce a floating point value

equal to the argument to

doubleToLongBits

.

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