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Another use of interfaces is being able to use an [[Object (computer science)|object]] without knowing its type of class, but rather only that it implements a certain interface. For instance, if one were annoyed by a whistling noise, one may not know whether it is a human or a parrot, because all that could be determined is that a whistler is whistling. The call <code>whistler.whistle()</code> will call the implemented method <code>whistle</code> of object <code>whistler</code> no matter what class it has, provided it implements <code>Whistler</code>. In a more practical example, a [[sorting algorithm]] may expect an object of type {{Javadoc:SE|java/lang|Comparable}}. Thus, without knowing the specific type, it knows that objects of that type can somehow be sorted.
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For example:
<syntaxhighlight lang="Java">
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