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A functor is an object with no data and a
single method.
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Functors
can be passed as parameters.
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Since
these classes are very “small”, they are usually
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implemented
as a Nested
Class wherever
they are needed.
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Nested
classes are defined inside other classes and it is
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essential
that it be declared as “static”. If it is not declared
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as
“static”, then it is an “inner” class (not nested).
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Nested
classes act as members of the “outer” class, and can
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be
declared as private, public, protected, or package visible.
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A
nested class can access private fields and members of the
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“outer”
class.
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Functors
can be implemented as a Local Class or as an
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Anonymous Class.
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