StreamMap.java

import java.util.HashMap;
import java.util.Map;

public class StreamMap {
    public static void main(String args[]) {
        Map<String, Integer> fruits = new HashMap<>();
        fruits.put("Banana", 7);
        fruits.put("Apple", 2);
        fruits.put("Kiwi", 1);

        int totalOfFruits = fruits.keySet().stream()
                .mapToInt(fruits::get).sum();

        System.out.println(totalOfFruits);
    }
}