How does the implementation of apps

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How does the implementation of apps

There are some fairly heady discussions, so I'd like to take the opportunity to break things down a bit for understanding why an interface is useful.

When I first started getting exposed to interfaces, I too was confused about their relevance. I didn't understand why you needed them. If we're using a language like Java or Cwe already have inheritance and I viewed interfaces as a weaker form of inheritance and thought, "why bother?

For example -- say you have a SIM game and have the following classes: But, you could say they are both annoying. Let's say our game needs to have some sort of random thing that annoys the game player when they eat dinner.

This could be a HouseFly or a Telemarketer or both -- but how do you allow for both with a single function?

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And how do you ask each different type of object to "do their annoying thing" in the same way? The key to realize is that both a Telemarketer and HouseFly share a common loosely interpreted behavior even though they are nothing alike in terms of modeling them. So, let's make an interface that both can implement: And they do not need to derive from the same base class and share common inherent characteristics -- they simply need to satisfy the contract of IPest -- that contract is simple.

You just have to BeAnnoying. In this regard, we can model the following: This means that in our little world, a member of the pests array could actually be a Telemarketer object or a HouseFly object.

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The ServeDinner method is called when dinner is served and our people in the dining room are supposed to eat. In our little game, that's when our pests do their work -- each pest is instructed to be annoying by way of the IPest interface. In this way, we can easily have both Telemarketers and HouseFlys be annoying in each of their own ways -- we care only that we have something in the DiningRoom object that is a pest, we don't really care what it is and they could have nothing in common with other.

How does the implementation of apps

This very contrived pseudo-code example that dragged on a lot longer than I anticipated is simply meant to illustrate the kind of thing that finally turned the light on for me in terms of when we might use an interface.

I apologize in advance for the silliness of the example, but hope that it helps in your understanding. And, to be sure, the other posted answers you've received here really cover the gamut of the use of interfaces today in design patterns and development methodologies.No account?

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Better yet, I like your idea of making kids experts. We have a Student Data Leadership Team (SDLT) – which I take not credit for – but I like watching my students create the videos that make them eligible for selection.

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