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Java 8 Streams - IntStream.average Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API 

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Interface:

java.util.stream.IntStream

java.lang.AutoCloseableAutoCloseablejava.util.stream.BaseStreamBaseStreamjava.util.stream.IntStreamIntStreamLogicBig

Method:

OptionalDouble average()

This terminal operation returns an OptionalDouble describing the arithmetic mean of elements of this stream, or an empty optional if this stream is empty. This is a special case of reduction.


Examples


package com.logicbig.example.intstream;

import java.util.OptionalDouble;
import java.util.stream.IntStream;

public class AverageExample {

    public static void main(String... args) {
        IntStream intStream = IntStream.of(1, 2, 3, 2, 5, 4);
        OptionalDouble average = intStream.average();
        System.out.println(average.orElse(-1));
    }
}

Output

2.8333333333333335




package com.logicbig.example.intstream;

import java.util.stream.IntStream;

public class AverageExample2 {

    public static void main(String... args) {
        IntStream intStream = IntStream.of(1, 2, 3, 2, 5, 4);
        double average = intStream.average().orElseThrow(RuntimeException::new);
        System.out.println(average);
    }
}

Output

2.8333333333333335

See Also