please help with this homework, language is java. please show output of toString method

ite a Class Zoo, that contains - Data members: 0 animals - a collection of animals, the number is NOT FIXED, you can add a new animal or remove one from it. - Methods: - Default constructor - Constructor with all data members - Copy constructor - int countAnimals(String type) - count in the zoo, how many animals belong to a certain type - ArrayList updateValidTypes() - go through all animals in the zoo and check if there is a valid type in the ArrayList from which no animals in the zoo belong to that type. If so, remove the type from the valid type ArrayList. Return an ArrayList of the removed types boolean isGenderBalanced(String type) - check if, for a specific type, the difference between the number of female and number of male is less than 20% of the total number of animals of that type. - Animal removeoldest(String type) - first check if the type is valid or not, if it is valid, then remove the oldest animal(s) of a certain type from the animals (if two animals have the same age, remove both), it then calls updateValidTypes() and returns the oldest Animal. equals() () xample: and setters