HCL Infosystems Technical Trainer Interview Questions and Answers

Q1. What is abstract class? Why we require abstract class?
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods. It is used for defining a common interface.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Used for defining a common interface for a group of related classes
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Q2. What is the difference between abstract class and interfaces?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract class can have constructors, member variables, and methods, while interfaces cannot.

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

• Abstract classes are used to define a common base class for related classes, while interfaces are used to define a contract for cl...read more
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