Class java.lang.Float
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Class java.lang.Float
java.lang.Object
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+----java.lang.Number
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+----java.lang.Float
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public final class
Float
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extends Number
The Float class provides an object wrapper for Float data values, and serves as
a place for float-oriented operations. A wrapper is useful because most of Java's
utility classes require the use of objects. Since floats are not objects in
Java, they need to be "wrapped" in a Float instance.
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Version:
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1.29, 10/02/95
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Author:
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Lee Boynton,
Arthur van Hoff
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MAX_VALUE
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The maximum value a float can have.
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MIN_VALUE
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The minimum value a float can have.
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NEGATIVE_INFINITY
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Negative infinity.
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NaN
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Not-a-Number.
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POSITIVE_INFINITY
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Positive infinity.
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Float(float)
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Constructs a Float wrapper for the specified float value.
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Float(double)
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Constructs a Float wrapper for the specified double value.
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doubleValue()
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Returns the double value of this Float.
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equals(Object)
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Compares this object against some other object.
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floatToIntBits(float)
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Returns the bit represention of a single-float value
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floatValue()
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Returns the float value of this Float object.
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hashCode()
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Returns a hashcode for this Float.
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intBitsToFloat(int)
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Returns the single-float corresponding to a given bit represention.
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intValue()
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Returns the integer value of this Float (by casting to an int).
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isInfinite(float)
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Returns true if the specified number is infinitely large in magnitude.
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isInfinite()
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Returns true if this Float value is infinitely large in magnitude.
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isNaN(float)
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Returns true if the specified number is the special Not-a-Number (NaN) value.
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isNaN()
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Returns true if this Float value is Not-a-Number (NaN).
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longValue()
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Returns the long value of this Float (by casting to a long).
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toString(float)
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Returns a String representation for the specified float value.
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toString()
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Returns a String representation of this Float object.
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valueOf(String)
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Returns the floating point value represented by the specified String.
POSITIVE_INFINITY
public final static float POSITIVE_INFINITY
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Positive infinity.
NEGATIVE_INFINITY
public final static float NEGATIVE_INFINITY
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Negative infinity.
NaN
public final static float NaN
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Not-a-Number. Note: is not equal to anything, including
itself
MAX_VALUE
public final static float MAX_VALUE
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The maximum value a float can have. The largest maximum value possible is
3.40282346638528860e+38.
MIN_VALUE
public final static float MIN_VALUE
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The minimum value a float can have. The lowest minimum value possible is
1.40129846432481707e-45.
Float
public Float(float value)
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Constructs a Float wrapper for the specified float value.
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Parameters:
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value
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the value of the Float
Float
public Float(double value)
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Constructs a Float wrapper for the specified double value.
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Parameters:
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value
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the value of the Float
toString
public static String toString(float f)
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Returns a String representation for the specified float value.
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Parameters:
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f
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the float to be converted
valueOf
public static Float valueOf(String s) throws NumberFormatException
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Returns the floating point value represented by the specified String.
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Parameters:
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s
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the String to be parsed
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Throws: NumberFormatException
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If the String does not contain a parsable
Float.
isNaN
public static boolean isNaN(float v)
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Returns true if the specified number is the special Not-a-Number (NaN) value.
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Parameters:
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v
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the value to be tested
isInfinite
public static boolean isInfinite(float v)
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Returns true if the specified number is infinitely large in magnitude.
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Parameters:
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v
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the value to be tested
isNaN
public boolean isNaN()
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Returns true if this Float value is Not-a-Number (NaN).
isInfinite
public boolean isInfinite()
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Returns true if this Float value is infinitely large in magnitude.
toString
public String toString()
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Returns a String representation of this Float object.
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Overrides:
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toString in class Object
intValue
public int intValue()
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Returns the integer value of this Float (by casting to an int).
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Overrides:
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intValue in class Number
longValue
public long longValue()
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Returns the long value of this Float (by casting to a long).
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Overrides:
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longValue in class Number
floatValue
public float floatValue()
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Returns the float value of this Float object.
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Overrides:
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floatValue in class Number
doubleValue
public double doubleValue()
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Returns the double value of this Float.
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Overrides:
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doubleValue in class Number
hashCode
public int hashCode()
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Returns a hashcode for this Float.
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Overrides:
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hashCode in class Object
equals
public boolean equals(Object obj)
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Compares this object against some other object.
Note: To be useful in hashtables this method
considers two Nan floating point values to be equal. This
is not according to IEEE specification
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Parameters:
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obj
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the object to compare with
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Returns:
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true if the objects are the same; false otherwise.
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Overrides:
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equals in class Object
floatToIntBits
public static int floatToIntBits(float value)
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Returns the bit represention of a single-float value
intBitsToFloat
public static float intBitsToFloat(int bits)
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Returns the single-float corresponding to a given bit represention.
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