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Languages themselves have limited functionality by themselves. In order to build full software you'll need to learn many frameworks, libraries and tools besides the language itself. Java beat C++ 15-20 years ago in popularity, not because it was necessarily a better language than C++ (actually it's more limited than C++) but because it came with frameworks ...


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This is almost impossible to answer surely with the information (or lack of) given? The choice of which language to use where is often a complex one that needs to consider what you want to achieve, who you will be working with (if you are working within a team), culture in the client or user's environment, long term code maintenance and management issues, ...


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You will have to read the example a few times. I infer from the text elsewhere that the <> (diamonds) is a way to highlight the type we are looking at. So the type is <D1> D1 is defined as class D1 extends B with C Since D1 is lowest in the hierarchy, it is shown last. B with C with <D1> The rest of the steps are expansions of B and ...



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