hello! can you help debug my program? it's in Java! here are the errors I'm getting: line 189: total_weight cannot be resolved or is not a fieldline 93: the type Snake must implement the inherited abstract method Animal.makeNoise()line 139: the method actual_num_animals(int) is undefined for the type Zooline 152: the left-hand side of an assignment must be a variableline 169: syntax error, insert } to complete Blockline 152: syntax error, insert “. class” to complete expressionline 139: syntax error on token “<“, ( expectedline 139: syntax error on token “{“ invalid AssignmentOperatorline 152: i cannot be resolved to a variableline 152: i cannot be resolved to a variableline 154: i cannot be resolved to a variable   here is my code: package zoo;   public abstract class Animal { private String name; private double weight; private int age;   public Animal() { name=""; weight=0; age=0; }   public Animal(String name, double weight, int age)  { this.name = name; this.weight = weight; this.age = age; }   public abstract String makeNoise(); public double getWeight() { return weight; } public String toString()  { return name+ ",weight" + weight+ ", age "+ age;   } }   public class Cow extends Animal  { private int num_spots;   public Cow() { super(); num_spots = 0;   }   public Cow(String name, double weight, int age, int num_spots)  { super(name, weight, age); this.num_spots = num_spots; }   @Override public String makeNoise() { return "Moooooo"; }   public String toString() { return "Cow" + super.toString()+ ". Number of spots: "+num_spots; } }   //horse   public class Horse extends Animal { private double top_speed; public Horse()  { super(); top_speed = 0.0; }   public Horse(String name, double weight, int age, double top_speed) { super(name, weight, age); this.top_speed = top_speed; }   @Override public String makeNoise()  { return "Whinny"; }   public String toString()  { return "Horse "+super.toString()+". Top speed: "+top_speed; } }   //Snake   public class Snake extends Animal  { private int num_fangs; public Snake() { super(); num_fangs = 0;   }   public Snake(String name, double weight, int age, int num_fangs) { super(name, weight, age); this.num_fangs=num_fangs; }   public String toString()  { return "Snake "+ super.toString() + ". Number of fangs: " + num_fangs; } }   //here is the zoo   public class Zoo { private int actual_num_animals; private int num_cages; private Animal[] animals;   public Zoo() { actual_num_animals = 0; num_cages = 20; animals = new Animal[num_cages]; } public Zoo(int num_cages) { actual_num_animals =0; this.num_cages=num_cages; animals=new Animal[num_cages]; }   public void add(Animal a) { if(actual_num_animals < num_cages) { animals[actual_num_animals< num_cages) ]{ animals[actual_num_animals]=a; actual_num_animals++;   } else { System.out.println("Cannot add more animals to the zoo."); } } public double total_weight() { double totalWeight = 0.0; for (int = 0; i<actual_num_animals; i++) { totalWeight += animals[i].getWeight(); } return totalWeight; } public void make_all_noises()  { for (int i=0; i < actual_num_animals; i++) { System.out.println(animals[i].makeNoise()); } } public void print_all_animals()  { for (int i = 0; i < actual_num_animals; i++)  { System.out.println(animals[i]); }   public static void main(String[]args) { Zoo z = new Zoo(); Snake sly = new Snake("Sly", 5.0, 2, 2); Snake sly2 = new Snake("Slyme", 10.0, 1, 2); Cow blossy = new Cow("Blossy", 900., 5, 10); Horse prince = new Horse("Prince", 1000., 5, 23.2);   //Following not allowed because Animal is abstract //Animal spot = new Animal("Spot, 10., 4);   z.add(sly); z.add(sly2); z.add(blossy); z.add(prince);;   z.make_all_noises(); System.out.println("Total weight ="+ z.total_weight); System.out.println("**************"); System.out.println("Animal Printout:"); z.print_all_animals();   } }