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Java object oriented - data structures


Pretty much any built in class that implements the List interface (e.g. LinkedList or ArrayList can be used to store as much data as the JVM will allow your program to use. To store these after the program closes, you'll need a way to store the data in either a file or a database of some sort, which you can load into a List as needed. As the List interface includes the contains(Object o) method, any subclass can be searched.

See the Java documentation for more detailed information.


Categories : Java

Related to : Java object oriented - data structures
Object-Oriented Programming and databases
Abstracting your persistence layer (database) is always a good idea. So, keep your class around! I would recommend a few things: Using a using statement only makes sense if you implement IDisposable. Otherwise; your method is fine. Don't do direct SELECT statements and the like in your code-behind. Those should be hidden behind methods in the persistence class. Otherwise; you are on the righ

Categories : Mysql
Object Oriented Modelling Advice
My thoughts are that Products should be a module(?), as other classes 'have products', as opposed to 'are products’? I'd prefer to make Product an AR::Model. In fact it is a separate entity with its own behavior and state. It is a core model of your app, if I understood everything right. I’m unsure that I even need a Product library (would it just be products.all?)? If you will

Categories : Ruby On Rails
Computing Histogram of Oriented Gradients
The third parameter channels in the call to cv::calcHist(...) should not be 0 (which makes it a null pointer). OpenCV expects here a pointer to an array of indices depicting the channels of interest. Since you want to use the first channels (index 0), your code should look like this: int channels[] = { 0 }; calcHist(&cell_fourPx, 1, channels, ...);

Categories : C++
nested structures in C
C unlike C++ cannot have nested types, you will have to declare them separately. struct employe { char mat[20]; int nmbrEnf; int ANC; double SB; double RCNSS; }; struct agence { char nom[20]; int nmbrEmp; struct employe * employees; // pointer to an array of employees }; Then use dynamic memory and populate them: struct agence * agencies; size_t num_agencies =

Categories : C
Which data structures are using how much memory
In code, you can just use the sizeof function. If you need a tool, you can just look for "Profiling tool C++" on your favorite search engine. You gonna have a lot of results.

Categories : C++
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