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In [[Garbage collection (computer science)|garbage-collected]] languages, such as [[Java (programming language)|Java]], [[C Sharp (programming language)|C#]], and [[Python (programming language)|Python]], destructors are known as ''[[finalizer]]s''. They have a similar purpose and function to destructors, but because of the differences between languages that utilize garbage-collection and languages with manual memory management, the sequence in which they are called is different.
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===== Abstract methods =====
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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. Abstract methods are used to specify [[Interface (computing)|interfaces]] in some computer 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|accessdate=11 December 2014}}</ref>
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