Computer Knowledge

Object-Oriented Programming

2,686 Questions

Object-oriented programming questions test core computer science concepts like classes, inheritance, polymorphism, and encapsulation. The focus includes Java program structures, method overloading, and memory allocation for objects. This topic is essential for technical sections in various recruitment tests.

Java class definitionsMethod overriding rulesPolymorphism conceptsGeneric type parametersMemory allocation in objects

Object-Oriented Programming Questions

Multiple choice

Consider the given statements. (1) OOP provides security to data using access specifiers. (2) OOP introduces the concept of classes for memory management. (3) OOP uses pointers to direct to a specified location.

Which of the given statements is/are the major advantage(s) of an object-oriented programming language?

  1. Only 1

  2. Only 1 and 3

  3. Only 1 and 2

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

OOP provides data security through access specifiers (private, protected, public) and uses classes with constructors/destructors for better memory management. Pointers are not unique to OOP - they're a low-level feature present in procedural languages like C.

Multiple choice

What will be the output of the program? class Tree { } class Pine extends Tree { } class Oak extends Tree { } public class Forest1 { public static void main (String [] args) { Tree tree = new Pine(); if( tree instanceof Pine ) System.out.println ("Pine"); else if( tree instanceof Tree ) System.out.println ("Tree"); else if( tree instanceof Oak ) System.out.println ( "Oak" ); else System.out.println ("Oops "); } }

  1. Pine

  2. Tree

  3. Forest

  4. Oops
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The program prints "Pine".

Multiple choice

Which of the following objects in object-oriented design is a package of software-controlled instruments, which collects data , performs some data processing and transmits this data for further processing?

  1. Map database

  2. Weather station

  3. Weather data

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is a package of software-controlled instruments, which collects data that performs some data processing and transmits this data for further processing.