How the principle of object oriented development can contribute to the maintainability of software system.?

Suppose you develop some software now and deploy it, and your business comes to depend on that software. Then your business expands and you start performing some new task which was unforeseen when you wrote the original code, but is related in some way to that task.

Updating your software in a traditional procedural system would require you to modify the original code, which could potentially break the functionality or introduce subtle bugs.

Object orientation allows you to subclass the original applicable code and write ONLY the parts that need revision for the NEW case while leaving the OLD code completely untouched, guaranteeing that the behaviour of that code will not change unexpectedly. At the same time, the new code can be developed without expending all of the original coding effort over again.

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