Java 8 功能.zip

# 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.