[Edit]

Java 8 - stream average

1 contributors

2 contributions

0 discussions

0 points

Created by:

halfera

411

In this article, we would like to show you how to find stream average in Java 8.

Quick solution:

xxxxxxxxxx
 
// example stream
Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3);
​
streamOfIntegers
        .mapToDouble(x -> x)
        .average()
        .ifPresent(avg -> System.out.println("average = " + avg));  // 2.0

Practical example

Edit

In this example, we use:

mapToInt() - to map each element of the stream to int,
average() - to calculate the average element of the stream,
ifPresent() - to display the average if the value is present.

xxxxxxxxxx
 
import java.util.stream.Stream;
​
public class Example {
​
    public static void main(String[] args) {
        // example stream
        Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3);
​
        // find stream average
        streamOfIntegers
                .mapToInt(x -> x)
                .average()
                .ifPresent(avg -> System.out.println("average = " + avg));
    }
}