06-ImplementAndTest

06-ImplementAndTest - From designing to coding 1st step...

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1 From designing to coding z 1 st step: sensibly split work among team members Choose splits along “thin” interfaces z Probably not equal parts; split biggest parts again later Formalize the interfaces – think of them as contracts – Write least-coupled parts first … most-coupled last z i.e., classes that don’t depend on any other classes z Oh yeah, one more thing to think about: Reserve ample time for testing! interface – a Java contract z So write the interfaces z Formalizes much of the contract Precisely defines available services (methods) But pre- and post-conditions are not insured z These are communicated by documentation only z Implement class and client class independently Can even compile clients (but cannot fully test) z Note: maybe change an interface to a class later e.g., client developed using interface A – okay to replace with class A later Pre- and post-conditions z The most important points to document z Pre-conditions – what the client is responsible for The “requires” clauses of the contract z Especially include any restrictions on calling arguments z Also any associations that should already exist z Post-conditions – what will be accomplished by the operation if the pre-conditions are met The “effects” and/or “modifies” contract clauses z Including all side effects (objects created/destroyed, associations formed/broken, attribute values modified) z Also should state any exceptions that might be thrown javadoc comments z “Cheap” external documentation Handy way to share just a class’s interface with team z Should always use to document all public declarations – classes, instance variables, methods
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