Citation :

Ramveer Gurjar, "Enhancing Software Maintainability in Object-Oriented Systems: An Empirical Study of Inheritance, Function Overriding and Function Overloading," International Journal of Computer Trends and Technology (IJCTT), vol. 74, no. 8, pp. 78-88, 2026. Crossref, https://doi.org/10.14445/22312803/IJCTT-V74I8P109

Abstract

Software metrics are widely used to improve the productivity and quality of software because they provide quantitative insight into the reliability and maintainability of a system. This paper presents a comparative empirical study of two closely related object-oriented (OO) polymorphism mechanisms — function overriding (used together with inheritance) and function overloading — and examines how each affects the run-time complexity, and therefore the maintainability, of Java programs. Two independent case studies were designed around a simple shape-area calculation problem. In the first case study, a class hierarchy that uses inheritance together with function overriding was compared against a functionally equivalent hierarchy that avoids overriding. In the second case study, a class that uses function overloading was compared against a functionally equivalent class that avoids overloading. Each program was executed repeatedly, and its running time was recorded using System.nanoTime(). The results show that, in both case studies, the version that uses the polymorphic construct (overriding or overloading) has a higher mean execution time and a higher Line-of-Code (LOC) count than its non-polymorphic counterpart, which is interpreted as an increase in run-time complexity. Since the complexity of this kind is a recognised proxy for maintenance effort, the paper argues that the convenience gained from overriding and overloading at design time carries a measurable maintainability cost that should be weighed explicitly during object-oriented design. The paper also reports a correction to an arithmetic labelling error present in the author's own earlier working data, recomputes the correct per-run averages, and discusses the threats to validity of the study together with directions for future work.

Keywords

Software Engineering, Software Maintainability, Object-Oriented Metrics, Inheritance, Function Overriding, Function Overloading, Polymorphism, Software Complexity, Lines of Code (LOC).

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