Difference between Abstract and protected?

Question

List the rules of abstraction if possible.

Answer 1

Think of a Zoo. There are many different animals. So we define an abstract class animal. This contains an attribute "legs" and a method "action" which prints out the sound the animal does. Cause animals have a different number of legs and do different noises you dont wanna implement them hard. So you define a class Lion which inherits Animal. Then you can override legs with a value of 4 and your action method by printing "Roar" in it. This you can do for all kind of animal.

Answer 2

Abstract classes cant be instantiated so they cant create any kind of methods or variables they are a blueprint for other classes

Answer 3

Abstract class are useful if you want to use an Array of Animal (regardless what type of animal) (to use @AKC's zoo) for example
You can also use them for the use of someone else. For example you code a library of graphic display (yeah your good) and you want to create a pattern so that programmers will be able to create their own object, you can use an abstract class for it

Answer 4

I dont list rules of abstraction, because your question targets two completely different things. Abstract is a programming concept to create a pattern for other classes. protected is an access modifier like public and private. protected variables can be accessed from all classes in your package.

Answer 5

what's the point of using abstract in real life coding? Just for setting a pattern? why?

Answer 6

Abstract is used for polimorfism (polimorfismo I dont know english, sorry). Protected is a encapsulation (cláusula de encapsulación, de acceso) or access clause.. the a class

Answer 7

@Baptiste I like that you built on others answers to expand yours. :)

Answer 8

abstract and protected are two different things
abstact class or method can't be instanciated
however a protected class or method is visible just in the same package

Answer 9

an abstract class is interface

Answer 10

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