Basic HTML version of Foils prepared 9 Sept 1997

Foil 42 More on Interfaces -- Why use them

From Java to be used in (Scientific) Computing Part II: Java Language and Object-Oriented Concepts Basic Simulation Track for Computational Science CPS615 -- Fall Semester 97. by Nancy J. McCracken,Geoffrey C. Fox


1 Note that Interfaces often play a software engineering as opposed to required functional role
2 Note that Interfaces are not significantly used in current Java release where perhaps there are 15 times as many class definitions as interface definitions
3 Two examples are Runnable and Cloneable both of which extend Object class -- note interfaces like classes can extend existing classes.
4 The Runnable Interface has one method run() which must always be overwritten and is used to indicate that class with this interface can use threads without being a subclass of Thread. Applets must use Runnable if they need explicit threads because they explicitly are a subclass of panel and as no multiple inheritance, one cannot be a subclass of two classes

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