import java.util.*;

public class Solution {
    public Map<String, Object> extraerConDefecto(Map<String, Object> obj, Map<String, Object> defaults) {
        Map<String, Object> result = new HashMap<>();
       
        result.putAll(defaults);

        for (Map.Entry<String, Object> entry: obj.entrySet()){
            if(entry.getValue() != null){
                result.put(entry.getKey(), entry.getValue());
            }
        }
        return result;
    }
}