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Java 8 Streams - DoubleStream.mapToInt Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.DoubleStream

Method:

IntStream mapToInt(DoubleToIntFunction mapper)

This terminal operation returns an IntStream consisting of the results of applying the given function to the elements of this stream.

Examples

package com.logicbig.example.doublestream;

import java.util.stream.DoubleStream;
import java.util.stream.IntStream;

public class MapToIntExample {

    public static void main(String... args) {
        DoubleStream ds = DoubleStream.of(1.0, 1.2, 2.0, 2.4, 3.0);
        IntStream intStream = ds.mapToInt(Math::getExponent);
        intStream.forEach(System.out::println);
    }
}

Output

See Also