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Tip of the Day
Language: Java Language
Expertise: Beginner
Jan 18, 2000

Anonymous Inner Classes

Question:
Is it possible for an anonymous inner class to extend a class and implement an interface, or for it to implement two or more interfaces?

Answer:
The only way an anonymous inner class can both extend a class and implement an interface is when it implicitly extends the Object class and is instantiated as an interface, or when it extends a class that already implements an interface.

The only way an anonymous inner class can implement two or more interfaces is if it is extending a class that already implements those interfaces. In other words, when you instantiate an anonymous class, only one interface or class name may follow the new keyword. Therefore, an anonymous inner class may only explicitly extend a single class or implement a single interface.

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