Stream class of Java8

Stream is a tool that uses functional programming to perform complex operations on a collection class.

1.collect (ToList ())

Generate a list from the values in the Stream

List<string> collected = Stream.of ("A", "B", "C")                               

2.map

Converts a value in a stream to a new stream

List<string> collected = Stream.of ("A", "B", "Hello")                               , string.touppercase ())                               . Collect (ToList ());

3.filter

Qualifying values are preserved

list<string> beginningwithnumbers = Stream.of ("A", "1abc", "ABC1")                                          , IsDigit (Value.charat (0 ))                                           . Collect (ToList ());

4.flatmap

First flatten the input data and then map the values after the flat

5.max, Min

Track Shortesttrack = tracks.stream (                            ), track.getlength ())                            . get ();

Summarize:

? Internal iterations give more control to the collection class.

? Like Iterator, Stream is an internal iterative approach.

? Many common collection operations can be accomplished by combining LAMBDA expressions with the methods on the Stream.

Reference: "Java8 functional Programming"

Stream class of Java8