Java Streams

Stream says a lot itself by the name of what it does! An interesting feature introduced in Java 8 that simplifies working with data collections by providing a functional, declarative approach to processing sequences of elements. Let’s revise the concept quickly -

Photo by Brian Botos on Unsplash

The easiest way to remember, how to use the stream functions -

1. Create Stream
2. Intermediate Operations
3. Terminal Operations

empList is ArrayList, create a stream , filter is intermediated operations and count use as Terminal Operations.

For example : empList.stream().filter((Integer dept)-> dept>10).count();

public class StreamExample1 {

    public static void main(String[] args) {
        Integer arr[] ={12,3,33,3,44,44,5,5};
        System.out.println("Using distinct() Operation-" + Arrays.stream(arr).distinct().collect(Collectors.toList()));

        System.out.println("Using sorted() Operation-" + Arrays.stream(arr).sorted().collect(Collectors.toList()));

        System.out.println("Using map() Operation-" +Arrays.stream(arr).map((Integer a)->a*a).collect(Collectors.toList()));

        Arrays.stream(arr).limit(5).forEach(System.out::println);
    }
}

Response from above output###
***********************************

Using distinct() Operation-[12, 3, 33, 44, 5]
Using sorted()…