La rappresentazione interna è in virgola mobile IEEE 754.
Wikipedia: Virgola mobile, IEEE 754.

Le classi corrispondenti definiscono delle costanti

java.lang.Double

public final class Double extends    Number
                          implements Comparable

Costruttori

Double(double)
Double(String)

Attributi

SIZE
MIN_VALUE MAX_VALUE
NEGATIVE_INFINITY POSITIVE_INFINITY
NaN

Metodi

isInfinite() isInfinite(double)
isNaN() isNaN(double)

byteValue()

shortValue()

intValue()
compare(double, double)

longValue()
doubleToLongBits(double)

floatValue(double)

doubleValue() parseDouble(String)
longBitsToDouble(long)

valueOf(String)

toString(double)

java.lang.Float

public final class Float extends    Number
                         implements Comparable

Costruttori

Float(float)
Float(double)
Float(String)

Attributi

SIZE
MIN_VALUE MAX_VALUE
NEGATIVE_INFINITY POSITIVE_INFINITY
NaN

Metodi

isInfinite(), isInfinite(float)
isNaN(float), isNaN(float)

byteValue()

shortValue()

intValue()
compare(float, float)
floatToIntBits(float)

longValue()

parseFloat(String), floatValue()
intBitsToFloats(int)

floatValue()

doubleValue()

toString(), toString(float)