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Java 8 Streams - LongStream.sum Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.LongStream

Method:

long sum()

Returns the sum of elements in this stream. This is a special case of a reduction

Examples

package com.logicbig.example.longstream;

import java.util.stream.LongStream;

public class SumExample {


    public static void main(String... args) {
        long sum = LongStream.of(4, 7, 9, 11, 13, 17)
                             .sum();
        System.out.println(sum);
    }
}

Output

package com.logicbig.example.longstream;

import java.util.stream.LongStream;

public class SumExample2 {

    public static void main(String... args) {
        long sum = LongStream.of(4, 7, 9, 11, 13, 17)
                             .parallel()
                             .sum();
        System.out.println(sum);
    }
}

Output

See Also