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    <p>The answer lies in your question itself. How do you think, a software is designed and a software is implemented?</p> <p>In design, we develop blueprint for designing workable software. This blue print involves a model which can be translated into software, while implementation involves the conversion of that model into actual software i.e code.</p> <p>Similarly, A component is generally bigger and more abstract than a class. While a class is a relatively low-level blueprint(<strong>design</strong>) for an object instance, a component might be a set of classes which together forms an encapsulated module(<strong>implementation</strong>) you then interface with. A component might even contain no classes at all!</p> <p>Now, <em>component diagrams don't show the actual code</em> but the <strong>dependencies</strong> between the <strong><em>actual implemented software components</em></strong> (these components can be anything like executables,files,folders etc. As for example :-</p> <p><img src="https://i.stack.imgur.com/vMuK4.jpg" alt="enter image description here"></p> <p>As I have already discussed; Class diagram is UML structure diagram which shows structure of the designed system at the level of classes and interfaces, shows their features, constraints and relationships - associations, generalizations, dependencies, etc. example of a class diagram :</p> <p><img src="https://i.stack.imgur.com/xw5NC.jpg" alt="enter image description here"></p> <p>I hope that I made myself clear.</p>
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    1. POComponent diagram versus Class diagram?
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    1. COIn both cases I am talking about design I would like to see an example in: 1)How can class and package diagrams model logical design of software? 2)How can component diagram models implementation view?
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    2. COAs you can see your `implementation view` (through component diagram)not reveal any implementation details?
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    3. COLogical design according to class perspective is an organisation of classes and their associations as you can see in my `class diagram`. Component diagrams model implementation view by just showing the implemented software components. As noted in other answers it shows less detailed view of the same class, just how they are implemented as software components.
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