What is the difference between the final class and the class?

Question

What is the difference between the final class and the class?

final class A {

}

class B {    

}

Answer 1

Final is a class modifier that prevents its inheritance or overriding. From Apple documentation

You can prevent overriding a method, property, or index by marking it final . Do this by writing the final modifier before the keywords of the method, property, or index introker like final var, final func, final class func, and final index).

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final, ( ). .

Answer 2

final .

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:

• / API, Framework, . final -. final , . , .
• final Swift, ( ), ( ). . Swift Developer.

Answer 3

final, , . - , , , . .

:

https://developer.apple.com/swift/blog/?id=27

Answer 4

Final , .

Answer 5

, final , , final, final , .

Answer 6

Other answers already provide enough understanding about the final keyword. I want to explain with some example.

Let's look at the example below without a finalkeyword.

class A {
   public var name: String
   var breed: String

    init(name: String, breed: String) {
        self.name = name
        self.breed = breed
    }
}
class B:A{
    override init(name: String, breed: String) {
        super.init(name: name, breed: breed)
    }
}

In the above code, this allows you to overwrite the variable of this superclass. A class with the last keyword does not allow. See below for an example.

final class A {
   public var name: String
   var breed: String

    init(name: String, breed: String) {
        self.name = name
        self.breed = breed
    }
}

class B:A{
    **//ERROR:inheritance from a final class 'A' class B**
    override init(name: String, breed: String) {
        super.init(name: name, breed: breed)
    }
}

The code above will inherit errors from the final class A of class B