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java.lang.Object

+java.lang.Number

+java.lang.Float
float
in
an object. An object of type Float
contains a single
field whose type is float
.
In addition, this class provides several methods for converting a
float
to a String
and a
String
to a float
, as well as other
constants and methods useful when dealing with a
float
.
float
.
float
.
float
.
float
.
float
.
Float
object that
represents the argument converted to type float
.
Float
object that
represents the primitive float
argument.
Float
object that
represents the floating point value of type float
represented by the string.
public static final float POSITIVE_INFINITY
float
.
public static final float NEGATIVE_INFINITY
float
.
public static final float NaN
float
.
public static final float MAX_VALUE
float
.
public static final float MIN_VALUE
float
.
public static final Class TYPE
public Float(float value)
Float
object that
represents the primitive float
argument.
Float
.
public Float(double value)
Float
object that
represents the argument converted to type float
.
Float
.
public Float(String s) throws NumberFormatException
Float
object that
represents the floating point value of type float
represented by the string. The string is converted to a
float
value as if by the valueOf
method.
Float
.
public static String toString(float f)
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
10^{3} <=
d <= 10^{7}
,
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
.
There is always a minimum of 1 digit after the decimal point. The
number of digits is the minimum needed to uniquely distinguish the
argument value from adjacent values of type float
.
public static Float valueOf(String s) throws NumberFormatException
Float
initialized to the
value represented by the String
argument.
public static boolean isNaN(float v)
true
if the argument is NaN;
false
otherwise.
public static boolean isInfinite(float v)
true
if the argument is positive infinity or
negative infinity; false
otherwise.
public boolean isNaN()
true
if the value represented by this object is
NaN; false
otherwise.
public boolean isInfinite()
true
if the value represented by this object is
positive infinity or negative infinity;
false
otherwise.
public String toString()
float
value represented by this object
is converted to a String
exactly as if by the method
toString
of one argument.
String
representation of this object.
public byte byteValue()
public short shortValue()
public int intValue()
float
value represented by this object
converted to type int
and the result of the
conversion is returned.
public long longValue()
float
value represented by this object is
converted to type long
and the result of the
conversion is returned.
public float floatValue()
float
value represented by this object.
public double doubleValue()
public int hashCode()
public boolean equals(Object obj)
true
if and only if the argument is
not null
and is a Float
object that
represents a float
that has the identical bit pattern
to the bit pattern of the float
represented by this
object.
Note that in most cases, for two instances of class
Float
, f1
and f2
, the value
of f1.equals(f2)
is true
if and only if
f1.floatValue() == f2.floatValue()
also has the value true
. However, there are two exceptions:
f1
and f2
both represent
Float.NaN
, then the equals
method returns
true
, even though Float.NaN==Float.NaN
has the value false
.
f1
represents +0.0f
while
f2
represents 0.0f
, or vice versa,
the equal
test has the value false
,
even though 0.0f==0.0f
has the value true
.
true
if the objects are the same;
false
otherwise.
public static native int floatToIntBits(float value)
Bit 31 represents the sign of the floatingpoint number. Bits 3023 represent the exponent. Bits 220 represent the significand (sometimes called the mantissa) of the floatingpoint number.
If the argument is positive infinity, the result is
0x7f800000
.
If the argument is negative infinity, the result is
0xff800000
.
If the argument is NaN, the result is 0x7fc00000
.
public static native float intBitsToFloat(int bits)
If the argument is 0x7f800000
, the result is positive
infinity.
If the argument is 0xff800000
, the result is negative
infinity.
If the argument is any value in the range 0x7f800001
through 0x7f8fffff
or in the range
0xff800001
through 0xff8fffff
, the result is
NaN. All IEEE 754 NaN values are, in effect, lumped together by
the Java language into a single value.
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