Can anyone explain me what should I do here?
package en.codegym.task.jdk13.task20.task2008;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
/*
Serialization of a zoo
*/
public class Solution {
public static void main(String[] args) throws JsonProcessingException {
Zoo zoo = new Zoo();
zoo.animals.add(new Zoo.Lion("Alex", 5.5));
zoo.animals.add(new Zoo.Penguin("Skipper", true, 8));
zoo.animals.add(new Zoo.Penguin("Kowalski", true, 7));
zoo.animals.add(new Zoo.Penguin("Rico", false, 6));
zoo.animals.add(new Zoo.Penguin("Private", false, 5));
String result = new YAMLMapper().writeValueAsString(zoo);
System.out.println(result);
}
}