How to avoid large if-statements and instanceof

Question

Animal

public abstract class Animal {
 String name;

 public Animal(String name) {
  this.name = name;
 }

}

Lion<

Answer 1

Here you have a List of animals. Usually when you have a list of Objects, all these objects must be able to do the same thing without being casted.

So the best two solutions are :

• Having a common method for the two concrete classes (so defined as abstract in Animal)
• Separate Lion from Deer from the start, and have two different lists.