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This principle is simply an expansion of the Open Closed Principle plus this means that we must make sure that fresh derived classes extend the base classes without even changing their behavior. Generally, we could do this by talking about abstractions for dependencies, like ports or abstract classes, rather than using concrete classes. But can we extend our program in order that it might calculate the section of not only Rectangles but in addition the field of Circles as well? We left our app without violating SRP. Our program needs the ability to figure out the total section of a collection of Rectangles. Since we already learned the Single Responsibility Principle (SRP), we overlook 't should put the whole area calculation code within the rectangle. It looks fine, but it isn't following SRP. And so the AreaCalculator class isn't closed for alteration. In other words, a class should be open for extensions, we can use inheritance to do this.

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Just how can we create our design in order to prevent this situation? Make sure that you select ones which have classy facilities, a good standing and don't have any hidden costs. The Liskov Substitution Principle (LSP) claims that "one ought to be able to utilize any established class instead of a parent group and also have it act in exactly the exact same manner without modification". Every contour comprises its area with its own means of calculation functionality and also our AreaCalculator class will end up simpler compared to previously. Here we will need to write functionality to load and then save text of some group of SQL files from the application directory. After some time our leaders may possibly inform us we could have a couple of read only files from the application folder, therefore we will need to restrict the leak if it tries to do a rescue . The SendEmail and ValidateEmail methods do not have a thing to perform within the UserService class. 4. Adjective A solid thing or mass does not need a space within , or openings or openings in it. We check the object type from the loop and do area calculation dependent on the object form. In order to avoid an exception we need to alter "SqlFileManager" by adding one condition to the loop.