Java8 Function Interface with Examples | Function and BiFunction Example in java8

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The Function Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function that takes in one argument and produces a result.

Hence this functional interface takes in 2 generics namely:-

T: denotes the type of the input argument
R: denotes the return type of the function
The lambda expression assigned to an object of Function type is used to define its apply() which eventually applies the given function on the argument.

Methods in Function Interface
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The Function interface consists of the following 4 methods:

1. apply() - This method applies the given function on its only argument.
2. andThen() - It returns a composed function wherein the parameterized function will be executed after the first one. If the evaluation of either function throws an error, it is relayed to the caller of the composed function.
3. compose() - It returns a composed function wherein the parameterized function will be executed first and then the first one. If the evaluation of either function throws an error, it is relayed to the caller of the composed function.
4. identity() - This method returns a function that returns its only argument.

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