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Cognizant · Object Oriented Programming
Practice Object Oriented Programming questions specifically asked in Cognizant interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
5
Tagged for this company + subject
Company
Cognizant
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Subject
Object Oriented Programming
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Go through each question and its explanation. Use this page for targeted revision just before your Cognizant Object Oriented Programming round.
The private modifier restricts access to members so they can be used only within the same class. It enforces encapsulation by preventing outside modification of internal data.
class Person { private int age; }For complete preparation, combine this company + subject page with full company-wise practice and subject-wise practice. You can also explore other companies and topics from the links below.
If you don’t define any constructor in many languages (for example Java or C++), the compiler supplies a default no-argument constructor. It allows object creation without supplying parameters.
Encapsulation binds data and methods together inside a class, preventing direct external access. It improves data security and modularity by using access modifiers like private and public.
class Account {
private double balance;
public void deposit(double amt){ balance += amt; }
}Polymorphism means 'many forms'. It allows the same method name or operator to behave differently depending on the object or context, such as method overloading (compile time) or overriding (runtime).
class Shape { void draw(){} }
class Circle extends Shape { void draw(){} }Constructor chaining means one constructor calls another in the same class (or base class) to reuse initialization logic. It helps avoid duplication and maintain consistent object setup.