Java 8 Functional Interfaces

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Java 8 Functional Interfaces - 

Supplier       ()    -> x
Consumer       x     -> ()
Callable       ()    -> x throws ex
Runnable       ()    -> ()
Function       x     -> y
BiFunction     x,y   -> z
Predicate      x     -> boolean
UnaryOperator  x1    -> x2
BinaryOperator x1,x2 -> x3

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