Suppose there is Class A which is parent class and class B extends A. Now I should not allow to extend class A to class C(Class C extends A) or any other class. How to do that?
CodePudding user response：
That's why java-17 has sealed classes. This feature was added as a preview feature in java-15.
In your case you can do the following:-
public sealed class A permits B {
}
So it can be only extended by class B not C.
Helpful links:
https://docs.oracle.com/en/java/javase/15/language/sealed-classes-and-interfaces.html
http://openjdk.java.net/jeps/409