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Java 8 Streams - IntStream.mapToLong Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.IntStream

Method:

LongStream mapToLong(IntToLongFunction mapper)

This intermediate operation returns a LongStream consisting of the results of applying the given mapper function to the elements of this stream.

Examples

package com.logicbig.example.intstream;

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

public class MapToLongExample {

    public static void main(String... args) {
        IntStream intStream = IntStream.range(1, 5);
        LongStream mapToLong = intStream.mapToLong(i -> (long) i + Integer.MAX_VALUE);
        mapToLong.forEach(System.out::println);
    }
}

Output

See Also