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Java 8 Streams - DoubleStream.count Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.DoubleStream

Method:

long count()

This terminal operation returns the count of elements in this stream. This is a special case of a reduction and is equivalent to:

mapToLong(e > 1L).sum()

Examples

package com.logicbig.example.doublestream;

import java.util.stream.DoubleStream;

public class CountExample {

    public static void main(String... args) {
        DoubleStream ds = DoubleStream.of(1.2, -1.3, 1.4, -1.5, 1.6, -1.7);
        long count = ds.count();
        System.out.println(count);
    }
}

Output

See Also