Connecting Interfaces to the Design Recipe

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Section 7.7 Connecting Interfaces to the Design Recipe

You’ve seen the Design Recipe—it has several steps that guide your coding process:

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Step 0: Restate the problem. ("We need a consistent way to handle multiple media types with a single method.")
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Step 1: Data definitions. (Define MusicTrack, PodcastEpisode, Audiobook classes.)
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Step 2: Method signature & purpose. (We specify "void play()" in Playable—a formal contract for media playing.)
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Step 3: Examples & Tests. (Test each class to confirm play() prints or does what we expect—if we forget or mismatch, the compiler error helps us fast.)
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Step 4: Skeleton / Outline. (Briefly outline how play() will be implemented in each class.)
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Step 5: Implementation & Reflection. (Fill in final code, verify tests, reflect on if more interface methods are needed.)
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Interfaces align perfectly with Step 2, turning your documented method signature into something the compiler enforces. If you skip or mismatch the method, the compiler halts and shows you exactly where to fix. This drastically reduces hidden bugs or guesswork about naming or parameters.

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