如何在Java中检查以下instanceof？

Question

I'm looking for a better way to do the following:

class Animal {}

class Dog extends Animal
class Cat extends Animal
class Rat extends Animal
class Bat extends Animal
.. 50 such animals

Now I have a list of animals - List<Animal> .

I want to do something like this:

for (Animal animal : animalList) {
   if (animal instanceof (Dog or Cat or 1 of 10 such animals) ) {
      //do something with animal.
   }
}

What is a good way to check wither this animal is an instance of a sublist if animals besides doing 10 instanceof checks?

Answer 1

The direct approach would be:

for (Animal animal : animalList) {
   for (Class clz : myClassSubList) {
      if (clz.isInstance(animal)) {
         //do something with animal.
         break;
      }
   }
}

edited: as per @shmosel's comment

Answer 2

Expanding on Rogue's comment:

Have Animal methods to differentiate subclasses like for example Animal.isMammal() or Animal.hasFourLegs()

Then the subclasses have properties like Dog.isMammal = true or Bat.hasFourLegs = false

Answer 3

abstract class AnimalSubgroup extends Animal
class Dog extends AnimalSubgroup
class Cat extends AnimalSubgroup
if (animal instanceof AnimalSubgroup) {
    // do thing
}

Another advantage of this approach is if there are common properties or methods that these animals should share, they can go in the abstract class.