# java8
Java 8 features

Differences between Java 8 Map() Vs flatMap() :

map() | flatMap() | 
--- | --- |  
It processes stream of values. | It processes stream of stream of values. 
It does only mapping. | It performs mapping as well as flattening.
It’s mapper function produces single value for each input value. | It’s mapper function produces multiple values for each input value. 
It is a One-To-One mapping. | It is a One-To-Many mapping. 
Data Transformation : From Stream<T> to Stream<R> | Data Transformation : From Stream<Stream<T> to Stream<R> 
Use this method when the mapper function is producing a single value for each input value. | Use this method when the mapper function is producing multiple values for each input value.