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Chapter 25 The java.lang Package |
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Chapter 25 The java.lang Package |
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This class provides an immutable object wrapper around the float primitive data type. valueOf() converts a string to a Float, floatValue() returns the primitive float value of a Float object, and there are methods for returning a Float value as a variety of other primitive types.
This class also provides some useful constants and static methods for testing float values. MIN_VALUE and MAX_VALUE are the smallest (closest to zero) and largest representable double values. isInfinite() in class method and instance method forms tests whether a float or a Float has an infinite value. Similarly, isNaN() tests whether a float or Float is not-a-number--this is a comparison that cannot be done directly because the NaN constant never tests equal to any other value, including itself. floatToIntBits() and intBitsToFloat() allow you to manipulate the bit representation of a float directly.
public final class Float extends Number {
// Public Constructors
public Float(float value);
public Float(double value);
public Float(String s) throws NumberFormatException;
// Constants
public static final float MAX_VALUE;
public static final float MIN_VALUE;
public static final float NEGATIVE_INFINITY;
public static final float NaN;
public static final float POSITIVE_INFINITY;
1.1public static final Class TYPE;
// Class Methods
public static native int floatToIntBits(float value);
public static native float intBitsToFloat(int bits);
public static boolean isInfinite(float v);
public static boolean isNaN(float v);
public static String toString(float f);
public static Float valueOf(String s) throws NumberFormatException;
// Public Instance Methods
1.1public byte byteValue(); // Overrides Number
public double doubleValue(); // Defines Number
public boolean equals(Object obj); // Overrides Object
public float floatValue(); // Defines Number
public int hashCode(); // Overrides Object
public int intValue(); // Defines Number
public boolean isInfinite();
public boolean isNaN();
public long longValue(); // Defines Number
1.1public short shortValue(); // Overrides Number
public String toString(); // Overrides Object
}
Object->Number(Serializable)->Float
Float.valueOf()
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| java.lang.ExceptionInInitializerError (JDK 1.1) |  |
java.lang.IllegalAccessError (JDK 1.0) |
