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==Abstract methods==
An '''abstract method''' is one with only a [[method signature|signature]] and no [[method body|implementation body]]. It is often used to specify that a subclass must provide an implementation of the method, as in an [[Class (computer programming)#Abstract and concrete|abstract class]]. Abstract methods are used to specify [[Interface (computing)|interfaces]] in some programming languages.<ref>{{cite web|title=Abstract Methods and Classes|url=http://docs.oracle.com/javase/tutorial/java/IandI/abstract.html|website=oracle.com|publisher=Oracle Java Documentation|access-date=11 December 2014}}</ref>
===Example===
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