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Java 8 - stream average

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Created by:
halfera
291

In this article, we would like to show you how to findĀ stream averageĀ inĀ Java 8.

Quick solution:

// example stream
Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3);

streamOfIntegers
        .mapToDouble(x -> x)
        .average()
        .ifPresent(avg -> System.out.println("average = " + avg));  // 2.0

Ā 

Practical example

In this example, we use:

  • mapToInt() - to map each element of the stream to int,
  • average() - to calculateĀ the average element of the stream,
  • ifPresent() - to display the average if theĀ value is present.
import java.util.stream.Stream;

public class Example {

    public static void main(String[] args) {
        // example stream
        Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3);

        // findĀ stream average
        streamOfIntegers
                .mapToInt(x -> x)
                .average()
                .ifPresent(avg -> System.out.println("average = " + avg));
    }
}

Output:

average = 2.0

References

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