CSS font stacks & developer FAQs with Web standards
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A: The code you are looking at declares an inline anonymous class that implements an interface, which has a similar effect. This declaration does not instantiate the interface, but defines the type of the anonymous class, which has no name of its own. This approach is often used in old-style Abstract Windowing Toolkit (AWT) or Swing applications where a class is required to fulfil a minimal interface and it is not necessary to retain a reference to it by assignment.
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This code seems to be instantiating an interface!