|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectjava.lang.Float
public final class Float
Minimal Float implementation that supports floatToIntBits and intBitsToFloat
Method Summary | |
---|---|
static int |
floatToIntBits(float value)
Returns the bit represention of a single-float value. |
static float |
intBitsToFloat(int value)
Returns the single-float corresponding to a given bit represention. |
static float |
parseFloat(String s)
Converts a String value into a float |
String |
toString(float f)
|
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait |
Method Detail |
---|
public static int floatToIntBits(float value)
0x80000000
) represents the sign of the floating-point
number.
0x7f800000
) represent the exponent.
0x007fffff
) represent the significand (sometimes called
the mantissa) of the floating-point number.
0x7f800000
.
0xff800000
.
If the argument is NaN, the result is the integer representing the actual NaN value. The lejos implementation behaves like floatToRawIntBits and does not collapse NaN values.
intBitsToFloat(int)
method, will produce a floating-point
value equal to the argument to floatToRawIntBits
.
value
- a floating-point number.
public static float intBitsToFloat(int value)
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 0x7fffffff
or in the range
0xff800001
through 0xffffffff
, the result is
NaN. All IEEE 754 NaN values of type float
are, in effect,
lumped together by the Java programming language into a single
float
value called NaN. Distinct values of NaN are only
accessible by use of the Float.floatToRawIntBits
method.
In all other cases, let s, e, and m be three values that can be computed from the argument:
Then the floating-point result equals the value of the mathematical expression s·m·2e-150.int s = ((bits >> 31) == 0) ? 1 : -1; int e = ((bits >> 23) & 0xff); int m = (e == 0) ? (bits & 0x7fffff) << 1 : (bits & 0x7fffff) | 0x800000;
value
- an integer.
public static float parseFloat(String s) throws NumberFormatException
s
- String representation of float. Must only contain numbers and an optional decimal, and optional - sign at front.
NumberFormatException
public String toString(float f)
|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |