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I was asked this question in an interview recently:
Can you name any class in the Java API that is final that shouldn't be or one that isn't and should be'?
I couldn't think of any. The question implies that I should know all the API classes like the back of my hand, which I personally wouldn't expect any Java developer to know.
If anyone knows any such classes, please provide examples.
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In effect, yes it does. A method in a final class cannot be overridden.
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 .
Abstract classes are similar to interfaces. You cannot instantiate them, and they may contain a mix of methods declared with or without an implementation. However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods.
No, the Methods that are declared as final cannot be Overridden or hidden. For this very reason, a method must be declared as final only when we're sure that it is complete.
java.awt.Dimension isn't final or immutable and should have been. Anything that returns a Dimension (e.g a Window object) needs to make defensive copies to prevent callers from doing nasty things.
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