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Java 8 Streams - LongStream.mapToInt Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.LongStream

Method:

IntStream mapToInt(LongToIntFunction mapper)

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

Examples

package com.logicbig.example.longstream;

import java.util.stream.IntStream;
import java.util.stream.LongStream;

public class MapToIntExample {

    public static void main(String... args) {
        LongStream stream = LongStream.of(4, 7, 9, 11, 13, 17);
        IntStream intStream = stream.mapToInt(Math::toIntExact);
        intStream.forEach(System.out::println);
    }
}

Output

See Also