Object‐Oriented Programming (OOP) Practice Test

Generics allow a single class or method to operate on different types, avoiding what?

Runtime type checks Memory leaks Rigid, hard-coded type definitions — one class/method works for many types Null checks

Correct Answer:

Rigid, hard-coded type definitions — one class/method works for many types

Explanation:

Generics let you write a single class or method that can work with many different types without tying the code to one specific type. The main win is avoiding rigid, hard-coded type definitions so one class or method can operate over many types. Without generics, you’d end up duplicating code for each type or resorting to using a general Object type with casts, which undermines type safety and makes maintenance harder. With generics, you declare a type parameter and apply it to different types, preserving type safety while keeping the implementation reusable. Some runtime checks or null handling may still occur in certain situations, but the essential benefit is the flexibility to support many types with a single, type-safe implementation.

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