Calculate Sum of List elements using Java Streams


In order to calculate the sum of all elements using Java Streams, we need to make use of the reduce function.

Example:
package org.code2care;

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        list.add(10);
        list.add(20);
        list.add(30);
        list.add(40);
        int sum = list.stream().reduce(0,Integer::sum);
        System.out.println("Sum="+sum);

    }
}
Output:

Sum=100

Advertisements
Try Out Code2care Dev Tools:

Advertisements

Advertisements
Code2care is an initiative to publish and share varied knowledge in programming and technical areas gathered during day-to-day learnings and development activities.

Students and software developers can leverage this portal to find solutions to their various queries without re-inventing the wheel by referring to our easy to understand posts. Technical posts might include learnings, tutorials, trouble-shooting steps, video tutorials, code snippets, how-to, blogs, articles, etc.

🎉 We are celebrating the 10th years of Code2care! Thank you for all your support!

We strongly support Gender Equality & Diversity.