Создание иерархии классов

import java.util.ArrayList;
import java.util.List;
 
public class Valers {
    
    List<Animals> result = new ArrayList<Animals>();
    
    public putAnimal(Animals a) {
        this.result.add(a);
    }
 
}

public class Bassein extends Valers {
    
}

abstract public class Animals {
    
    private String name;
    private int weight;
 
    private boolean isMale;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return weight;
    }
 
    public void setAge(int age) {
        this.weight = weight;
    }
 
    public boolean isMale() {
        return isMale;
    }
 
    public void setMale(boolean isMale) {
        this.isMale = isMale;
    }
 
    public Animals(String name, int weight, boolean isMale) {
        this.name = name;
        this.weight = weight;
        this.isMale = isMale;
    }
    
}

public class Bird extends Animals {
    
    public Bird(String name, int weight, boolean isMale) {
        super(name, weight, isMale);
    }
}

public class Zoopark {
 
    public static void main(String[] args) {
        
        Bassein V1 = new Bassein();
        Bird B = new Bird("Vala", 100, true);
        V1.putAnimal(B);
    }
    
}

public putAnimal(Animals a)

public void putAnimal(Animals a)