Can a class extend an interface?

A good answer might be:

No. A class always extends just one class.

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• What an interface is.
• How a class implements an interface.
• Implementing several interfaces.
• An example of a constant in an interface.
• Using an interface as a type of a reference variable.
• Use of a type cast with a reference variable.
• Public interfaces.
• Extending an interface.

The next chapter will discuss the Vector class and the Enumeration interface.