CSS font stacks & developer FAQs with Web standards
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A: It is only possible to call a concrete method of an abstract class when the method is instantiated through a concrete subclass. The method must also have a public or package visibility modifier that makes it accessible to the calling class. When you call the method on the subclass, it implicitly invokes superclass implementation, as in the example below.
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How can I call a concrete instance method on an abstract class?