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In fact most IDEs are extensible through the use of

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plug-ins. And by the way, note that plug-ins might be

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called differently on different platforms. For example, if you're using

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a Microsoft Visual Studio, plug-ins are normally called add-ins, but

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the concept is more or less the same. So, what

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is a plug-in? Well, let's imagine our IDE to be

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this box. A plug-in is additional functionality that you can

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actually plug into this box so that this box starts

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offering more features to the user. For example, you

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can add to Eclipse the Checkstyle plug-in. Which, paraphrasing the

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Checkstyle website, helps you ensure that your Java code

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complies with a set of coding standards by inspecting the

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code and pointing out items that deviate from a

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defined set of coding rules. Again, this is a functionality

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the core of Eclipse doesn't have. You can add

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the Checkstyle plug-in, and this functionality will become available in

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the IDE. Another example of plug-in is the EGit plug-in which

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adds support for the Git version control system in Eclipse. And

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actually this is something that we'll cover in detail, we'll have

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a demo, and we will actually use it throughout the class, so

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I'm not going to say anything more about the EGit plug-in for

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now. But again, what the plug-in will do is to add

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the Git functionality to Eclipse. A functionality that is not in

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the core of Eclipse and that is available to the user after

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you add the plug-in.