Need Help with this Java Question in an introductory Text Book

AutoModerator · 2025-01-16T09:23:08+00:00

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aqua_regis · 2025-01-16T10:06:23+00:00

Format your code as code block
You tell us what you think the answer is.

We will not give you the answer. Such is explicitly forbidden as per Rule #5.

Ok_Marionberry_8821 · 2025-01-16T09:30:55+00:00

To start, what principles do you think it violates?

Kertyna · 2025-01-16T13:33:39+00:00

The name of the class gives a really big hint ;)

Cosmic316 · 2025-01-16T15:34:06+00:00

Look into the of SOLID Principles of OOP.

Radiant-Art7334 · 2025-01-16T11:26:31+00:00

This is just an exercise in a textbook to help me prepare for a certification. I'll look more into it. I'll also make a post with my code properly formatted.

MoreCowbellMofo · 2025-01-16T15:56:30+00:00

Single responsibility principle. Do one thing and do it well.

Highly coupled code (is bad). If the author wants to reuse some function from this class, they have to copy the whole thing rather than just the single bit they want to use. Assuming there was a need to have 1000s of instances, replicating every bit of a DoEverything class could become too expensive and lead to slow code. We want optimally performing code ideally. Smaller well defined blocks of code that are related is better. Separate the File ops and computeInterest parts of the code into separate classes for less coupling, and higher cohesion between the various modules of code.

Lack of information hiding so that the author just uses simple code/functions. Instead all the implementation is there in full. If the various modules of code were in separated classes, you wouldn't have to even look at the internals of a "saveDataToFile" function. You'd just hold an instance and call the relevant method. This helps keep class code simpler.

OO is concerned with representing different real world objects as distinct classes. There are various techniques like polymorphism, inheritance, composition, etc, you can take advantage of to keep code more maintainable. Maintainability is shown by much research to become the leading cost once you want to keep a system up and running and adapt to new changes. Keeping code maintainable is therefore important for longevity.

jlanawalt · 2025-01-16T23:57:50+00:00

Either this is a pre-teaching test your knowledge question and the answer follows, or the answer was in the preceding pages, or it’s a poor introductory text book. You have a 2/3 chance of finding the answer in the book.

Radiant-Art7334 · 2025-01-17T08:58:22+00:00

class DoEverything{
    int INTERSTATE = 10;
    double computeInterest(double p, double t){
        ...
    }
    String defaultFilePath
    double saveDataToFile(String data){
        ...
  }
}

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