Practice›Java Fundamentals›Module 11. Modern Java›11.4 Lambdas and streams

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11.4 Lambdas and streams — count positive numbers

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Task

Fill in countPositive using a stream so that it returns how many numbers are greater than 0.

filter keeps what matches, count reports how many remain — but it returns a long, so cast to int. The program prints 3 and then 0.

Your solution

import java.util.List;

public class Main {

    public static int countPositive(List<Integer> nums) {
        // stream: keep the positives, then count them

    }

    public static void main(String[] args) {
        List<Integer> nums = List.of(3, -1, 4, -2, 5);
        System.out.println(countPositive(nums));
        System.out.println(countPositive(List.of()));
    }
}

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