20+ BankBazaar Interview Questions and Answers

Javascript code to find frequency of characters in a sentence and difference between dynamic and static initialization.

• To find frequency of characters in a sentence, create an object and iterate over each character in the sentence. Increment the count of each character in the object.

• Dynamic initialization refers to initializing a variable at runtime, while static initialization refers to initializing a variable at compile time.

• Example of dynamic initialization: int x = new in...read more

To optimize a complex API, consider reducing unnecessary data transfer, caching frequently accessed data, using efficient data structures, and implementing proper error handling.

• Identify and remove unnecessary data transfer to reduce latency

• Implement caching mechanisms for frequently accessed data to improve performance

• Use efficient data structures and algorithms to optimize processing speed

• Implement proper error handling to ensure robustness and reliability

• Consider implement...read more

Questions on Java basics - .equals() vs ==, Fibonacci series, and MultiThreading.

• The .equals() function compares the values of two objects, while == compares their memory addresses.

• Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

• MultiThreading is a technique where multiple threads of execution run concurrently within a single program.

• Examples: 5 == 5 is true, but new String('hello') == new String('hello') is false.

• Fibonacci ser...read more

To print second highest number in a list of integers in Java

• Sort the list in descending order

• Print the second element in the sorted list

Find the second largest number from an array of strings.

• Convert the array of strings to an array of numbers.

• Sort the array in descending order.

• Return the second element of the sorted array.

The difference between == and === is that == checks for equality after type conversion, while === checks for equality without type conversion.

• == is a loose equality comparison operator that performs type coercion before comparing two values.

• === is a strict equality comparison operator that does not perform type coercion before comparing two values.

• Example: 5 == '5' will return true because the values are equal after type coercion, but 5 === '5' will return false because they ...read more

App life cycle involves various stages like launch, background, inactive, active, and termination. App delegate methods manage these stages.

• App delegate methods are used to respond to important events in the app's life cycle, such as app launch, backgrounding, foregrounding, and termination.

• Some of the key methods in the app delegate include application(_:didFinishLaunchingWithOptions:), applicationDidEnterBackground(_ :), applicationDidBecomeActive(_ :), and applicationWillT...read more

OOPs (Object-Oriented Programming) is a programming paradigm that uses objects to represent and manipulate data.

• OOPs is based on the concept of classes and objects.

• It allows for encapsulation, inheritance, and polymorphism.

• Objects have properties (attributes) and behaviors (methods).

• Example: In a banking system, a class 'Account' can have objects representing individual bank accounts.

Exceptions are events that occur during the execution of a program that disrupts the normal flow of instructions.

• Exceptions are objects that are thrown at runtime when an abnormal condition occurs

• They can be caught and handled using try-catch blocks

• Java has a hierarchy of exception classes, with the base class being Throwable

• Checked exceptions must be handled or declared in the method signature

• Unchecked exceptions do not need to be handled or declared

Concatenate strings in array until total length is greater than 1

• Iterate through array and concatenate strings until length is greater than 1

• Use a loop to keep adding strings until total length exceeds 1

• Check total length after each concatenation to ensure it is greater than 1

Oops concepts are fundamental principles in object-oriented programming that help in organizing and designing code efficiently.

• Encapsulation: Wrapping data and methods into a single unit (class). Example: Class Car with properties like make, model, and methods like start(), stop().

• Inheritance: Reusing code from existing classes to create new classes. Example: Class SUV inheriting from class Car.

• Polymorphism: Ability of objects to take on multiple forms. Example: Overloading a...read more

To connect to a database, you need to use a database connection string with the appropriate credentials.

• Use a database connection string with the necessary information such as server address, database name, username, and password.

• Choose the appropriate database driver for the type of database you are connecting to (e.g. MySQL, PostgreSQL, MongoDB).

• Establish a connection using a programming language-specific database library or framework (e.g. JDBC for Java, psycopg2 for Pytho...read more

Reverse a string while preserving white spaces

• Iterate through the string from end to start

• Keep track of white spaces and insert them in the reversed string

• Example: 'hello world' -> 'dlrow olleh'

Comparator and Comparable are interfaces used for sorting objects in Java.

• Comparable interface is used to define the natural ordering of objects.

• Comparator interface is used to define custom ordering of objects.

• Comparable interface has compareTo() method while Comparator interface has compare() method.

• Comparable interface is implemented by the class whose objects need to be sorted while Comparator interface is implemented by a separate class.

• Example: String class implements C...read more

URL Session using completions is a way to handle network requests in iOS development.

• URL Session is a class in iOS used for making network requests.

• Completions are closures that are called when a network request completes.

• Using completions allows for handling the response data or errors after a network request.

• Example: URLSession.shared.dataTask(with: url) { (data, response, error) in }

View life cycle refers to the process of creating, updating, and destroying views in an Android application.

• View life cycle includes methods like onCreate, onStart, onResume, onPause, onStop, and onDestroy.

• These methods are called at different stages of a view's life cycle, allowing developers to perform actions like initializing UI components, saving instance state, and releasing resources.

• For example, onCreate is called when a view is first created, onStart is called when t...read more

Object-oriented programming concepts focus on classes, objects, inheritance, encapsulation, and polymorphism.

• Classes: Blueprint for creating objects with attributes and methods.

• Objects: Instances of classes that contain data and behavior.

• Inheritance: Ability for a class to inherit attributes and methods from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability for objects of different classes to respond to th...read more

ACID properties are a set of properties that guarantee reliable database transactions.

• Atomicity: All operations in a transaction are completed successfully or none at all.

• Consistency: Database remains in a consistent state before and after the transaction.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once a transaction is committed, changes are permanent and cannot be lost.

• Example: Transfer of funds between two bank accounts must be...read more

I am open to opportunities in various locations, with a preference for cities with a strong tech industry.

• Open to various locations

• Preference for cities with strong tech industry