Object-Oriented Programming (OOP)
A design pattern that restricts the instantiation of a class to a single shared object. What is this concept called?
Difficulty: Hard
About this MCQ
This Hard Object-Oriented Programming (OOP) question asks: A design pattern that restricts the instantiation of a class to a single shared object. What is this concept called? The correct choice is D. Singleton pattern. Read the options below, commit to one, then use the explanation to see why that choice holds and why the others do not.
Object-Oriented Programming (OOP) items like this one are written for Pakistan exams such as CSS, FPSC, PPSC, and NTS. The difficulty label is a hint about how much of the topic the stem assumes, not a score. Tags and exam names, when they are present, tell you where else the same idea is tested. Previous and next links stay in Object-Oriented Programming (OOP) so you can continue the subject. Related questions point at nearby stems if you want another angle on the same idea.
Treat the explanation as part of the question, not a footnote. If you missed it, reread the stem against the correct option before you open the next Object-Oriented Programming (OOP) item. A timed quiz is the same pool with a clock and a score. A past paper is a full sitting rather than this single question.
- A. Super keyword
Why not A: “Super keyword” does not fit this question. The answer is Singleton pattern.
- B. Association
Why not B: “Association” does not fit this question. The answer is Singleton pattern.
- C. Message passing
Why not C: “Message passing” does not fit this question. The answer is Singleton pattern.
- D. Singleton pattern ✓
Correct answer
D. Singleton pattern
Explanation
Singleton pattern (option D) is the accepted answer to “A design pattern that restricts the instantiation of a class to a single shared object. What is this concept called”. Option A (Super keyword) does not fit this question. Option B (Association) does not fit this question. Option C (Message passing) does not fit this question. For this Object-Oriented Programming (OOP) question, the accepted answer is Singleton pattern.
Source: Object-Oriented Programming (OOP) Official Reference Guide
Tags: computer science, oop, object-oriented programming, software design
Submitted by: MCQsHub Editorial
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