BigBasket Interview Questions and Answers

Checked exceptions are checked at compile-time, while unchecked exceptions are not.

• Checked exceptions are declared in the method signature or caught using try-catch blocks.

• Unchecked exceptions do not need to be declared or caught explicitly.

• Checked exceptions are typically used for recoverable errors, while unchecked exceptions are used for unrecoverable errors.

• Examples of checked exceptions include IOException and SQLException.

• Examples of unchecked exceptions include NullPoi...read more

Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a method in a subclass with the same name and parameters as in the superclass.

• Method overloading is compile-time polymorphism while method overriding is runtime polymorphism.

• Method overloading is used to provide different ways of calling the same method with different parameters.

• Method overriding is used to provide a specific implementation of a method that i...read more

To create an object, define a class and instantiate it using the 'new' keyword.

• Define a class with properties and methods

• Instantiate the class using the 'new' keyword

• Access the object's properties and methods using dot notation

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class, and can also add new properties and methods.

• For example, a class Animal can be a parent class, and class...read more

throw is used to explicitly throw an exception in a method, while throws is used to declare the exceptions that a method may throw.

• throw is used within a method to throw an exception when a certain condition is met

• throws is used in the method signature to declare the exceptions that may be thrown by the method

• throw is followed by an exception object, while throws is followed by the exception class names separated by commas

• Example: throw new IllegalArgumentException("Invalid i...read more

A collection is a group of related objects or data items that can be accessed and manipulated in a unified way.

• Collections are used to store and organize data in a program.

• They can be of various types such as arrays, lists, sets, maps, etc.

• Collections provide methods to add, remove, and access elements.

• Examples include ArrayList, HashSet, TreeMap, etc.

An interface is a contract that specifies the methods and properties that a class must implement.

• An interface defines a set of methods and properties that a class must implement

• Interfaces are used to achieve abstraction and polymorphism

• Interfaces can be used to define contracts between different parts of a system

• A class can implement multiple interfaces

• Interfaces are declared using the 'interface' keyword in most programming languages

OOPs is a programming paradigm based on the concept of objects that interact with each other.

• OOPs stands for Object-Oriented Programming.

• It focuses on creating objects that have properties and methods.

• Encapsulation, Inheritance, and Polymorphism are the three main pillars of OOPs.

• Encapsulation is the process of hiding the internal details of an object from the outside world.

• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows obj...read more