FINAL CLASS
You can declare some or all of a class's methods final. You use the final
keyword in a method declaration to indicate that the method cannot be overridden by subclasses. The Object
class does this—a number of its methods are final
.
You might wish to make a method final if it has an implementation that should not be changed and it is critical to the consistent state of the object. For example, you might want to make the getFirstPlayer
method in this ChessAlgorithm
class final:
Methods called from constructors should generally be declared final. If a constructor calls a non-final method, a subclass may redefine that method with surprising or undesirable results.Note that you can also declare an entire class final — this prevents the class from being subclassed. This is particularly useful, for example, when creating an immutable class like theclass ChessAlgorithm { enum ChessPlayer { WHITE, BLACK } ... final ChessPlayer getFirstPlayer() { return ChessPlayer.WHITE; } ... }
String
class.
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