a final class can have instances

can have instance variables □ can have constructors □ classes can only ' extend' one abstract class □ Interfaces □ can only define 

classes by declaring them as final classes ¢ This is achieved members } ¢ Any attempt to inherit these classes will cause an error 5 of class—it contains methods and variables, but they have An object is a particular instance of a class

You have already seen how class type hinting and access control give you more control over a class's Final classes and methods Limiting inheritance static property is available to every instance of a class, so you can set values that you 

create instances, • be inherited by subclasses (and can inherit from existing classes), they may return the number of instances of this class that have been created A class is normally only specified as final when it does not make sense to

Jan 10, 2020 · class The following code, which attempts to use inheritance, will not compile final final final For class to succeed in reusing the code of instance methods embedded in class , it must have an explicit reference to an object of

object of the class having static variable will have the same instance of static variable Static variables represent common property of a class It saves memory

State (instance variables) Each object (instance of a class) will have its You can modify a class declaration using the keyword final, abstract, or strictfp

final ▫ the many meanings of the final keyword ▫ final classes ▫ final methods public final class LastVersion extends Foo { methods can have final arguments class Life ▫ instances store the state, perform updates for one life board

have the same signature ▫ they are not required to always create a new object ▫ Permit the creation of instance controlled classes the static factory method can 

If you get a compiled Aclass you can use it A a = new A(); int y = acompute(x); ❑ But, sometimes, you would like to modify slightly the behavior of the instances