import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
class Solution {
    public static void main(String[] args) {
        Map<String, String> myMap = new HashMap<>();
        myMap.put("a", "Something");
        myMap.put("b", null);
        myMap.put("c", "more");
 
        List<String> myList = Arrays.asList("a", "b");
 
        myMap.keySet()
            .stream()
            .filter(k -> myMap.get(k) != null && myList.contains(k))
            .findAny()
            .ifPresent(
                // Atleast one not null value is present in myMap with key in myList
                System.out::println // A sample action
            );
    }
}
 

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