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Sum Numbers Using Stream Reduction

Java Hard 4 views

Learn Java Stream reduction operations to aggregate data into single values. You will use reduce operations and collectors to compute sums, products, and other aggregations from streams of data.

Your goal is to understand how terminal operations transform streams into results. You will practice combining elements using reduction patterns that work efficiently for various aggregate calculations.

Example 1:

Input: numbers = [1, 2, 3, 4, 5]
Output: 55
Explanation: Sum of squares (1 + 4 + 9 + 16 + 25).

Example 2:

Input: numbers = [2, 4, 6, 8]
Output: 80
Explanation: Sum of squares of even numbers.

Example 3:

Input: numbers = [1, 2, 3, 4, 5, 6]
Output: 3
Explanation: Count even numbers using stream.

Algorithm Flow

Recommendation Algorithm Flow for Sum Numbers Using Stream Reduction - Budibadu
Recommendation Algorithm Flow for Sum Numbers Using Stream Reduction - Budibadu

Best Answers

java - Approach 1
import java.util.List;

class Solution {
    public long processParallel(List<Integer> numbers) {
        return numbers.stream()
                     .mapToLong(Integer::longValue)
                     .sum();
    }
}