import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
 
class Ideone {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add(null);
        list.add("Hello");
        list.add("world");
        System.out.println(getFirstNotNull(list));
    }
 
    private static String getFirstNotNull(List<String> list) {
        return list.stream().filter(Objects::nonNull).findFirst().orElse(null);
    }
}

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