Java 8 Tutorial 08 :- Function Interface in Java | Predefined Functional Interfaces
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In Java 8, Function is a functional interface. It takes an argument (object of type T) and returns an object (object of type R).
The Function Interface is a part of the java.util.function package.
As per documentation :-
@FunctionalInterface
public interface Function
Represents a function that accepts one argument and produces a result.
This is a functional interface whose functional method is apply(Object).
The functional method is apply :-
R apply(T t)
T: denotes the type of the input argument
R: denotes the return type of the function
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