@FunctionalInterface public interface Float2FloatFunction extends Function<java.lang.Float,java.lang.Float>, java.util.function.DoubleUnaryOperator
Function; provides some additional methods that use
polymorphism to avoid (un)boxing.
Type-specific versions of get(), put() and remove()
cannot rely on null to denote absence of a key. Rather, they return a
default return value, which is set to
0/false at creation, but can be changed using the
defaultReturnValue() method.
For uniformity reasons, even functions returning objects implement the
default return value (of course, in this case the default return value is
initialized to null).
The default implementation of optional operations just throw an
UnsupportedOperationException, except for the type-specific containsKey(), which return true. Generic versions of accessors delegate to
the corresponding type-specific counterparts following the interface rules.
Warning: to fall in line as much as possible with the
standard map interface, it is required that
standard versions of get(), put() and remove() for
maps with primitive-type keys or values return null to denote
missing keys rather than wrap the default return value in an object. In
case both keys and values are reference types, the default return value must
be returned instead, thus violating the standard
map interface when the default return value is not null.
Function| Modifier and Type | Method and Description |
|---|---|
default double |
applyAsDouble(double operand)
Deprecated.
Please use primitive types which don't have to be widened as
keys.
|
default boolean |
containsKey(float key)
Returns true if this function contains a mapping for the specified key.
|
default boolean |
containsKey(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
default float |
defaultReturnValue()
Gets the default return value.
|
default void |
defaultReturnValue(float rv)
Sets the default return value (optional operation).
|
float |
get(float key)
Returns the value to which the given key is mapped.
|
default java.lang.Float |
get(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
default float |
put(float key,
float value)
Adds a pair to the map (optional operation).
|
default java.lang.Float |
put(java.lang.Float key,
java.lang.Float value)
Deprecated.
Please use the corresponding type-specific method instead.
|
default float |
remove(float key)
Removes the mapping with the given key (optional operation).
|
default java.lang.Float |
remove(java.lang.Object key)
Deprecated.
Please use the corresponding type-specific method instead.
|
@Deprecated default double applyAsDouble(double operand)
In this default implementation, the key gets narrowed down to the actual key
type, throwing an exception if the given key can't be represented in the
restricted domain. This is done for interoperability with the Java 8 function
environment. Its use is discouraged, as unexpected errors can occur. Instead,
the corresponding classes should be used (e.g.,
Int2IntFunction instead of
Short2IntFunction).
applyAsDouble in interface java.util.function.DoubleUnaryOperatorjava.lang.IllegalArgumentException - If the given operand is not an element of the key domain.default float put(float key,
float value)
key - the key.value - the value.Function.put(Object,Object)float get(float key)
key - the key.Function.get(Object)default float remove(float key)
key - the key.Function.remove(Object)@Deprecated
default java.lang.Float put(java.lang.Float key,
java.lang.Float value)
key - the key.value - the value.null if no value was present for the given key.Map.put(Object,Object)@Deprecated default java.lang.Float get(java.lang.Object key)
key - the key.null if no value was present for the given key.Map.get(Object)@Deprecated default java.lang.Float remove(java.lang.Object key)
key - the key.null if no value was present for the given key.Map.remove(Object)default boolean containsKey(float key)
Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.
key - the key.key.Function.containsKey(Object)@Deprecated default boolean containsKey(java.lang.Object key)
Note that for some kind of functions (e.g., hashes) this method will always return true. This default implementation, in particular, always return true.
key - the key.key.Map.containsKey(Object)default void defaultReturnValue(float rv)
get(),
put() and remove() to denote that the map does not contain
the specified key. It must be 0/false/null by default.rv - the new default return value.defaultReturnValue()default float defaultReturnValue()
This default implementation just return the default null value of the type
(null for objects, 0 for scalars, false for Booleans).