TCS Associate Business Analyst Interview Questions and Answers for Experienced

OOPS concept in Java

• OOPS stands for Object-Oriented Programming System

• Java is an object-oriented programming language

• Encapsulation, Inheritance, Polymorphism, and Abstraction are the four main OOPS concepts in Java

• Encapsulation is the process of hiding implementation details from the user

• Inheritance is the process of creating a new class from an existing class

• Polymorphism is the ability of an object to take on many for...read more

No, multiple inheritance is not possible in Java.

• Java does not support multiple inheritance of classes due to the diamond problem.

• However, multiple inheritance of interfaces is possible.

• Diamond problem occurs when two superclasses have a common method with same signature.

• Example: class A and class B both have a method void display() and class C extends A, B. Which display() method will be called?

• To avoid this, Java all...read more

Classes are blueprints for objects while interfaces define a set of methods that a class must implement.

• Classes can have attributes and methods while interfaces only have method signatures.

• A class can implement multiple interfaces but can only inherit from one class.

• Classes can be instantiated while interfaces cannot.

• Example: Class - Car, Interface - Drivable

• Car can have attributes like color, model, etc. and methods l...read more