Interview Questions and Answers for 'AT' | Search Interview Question

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Q211. Describe structure of a Web application.

architecture

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Q212. Difference between == and === ?

JavaScript

Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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Q213. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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Q214. Can we use Prototype Bean scope with Autowiring ?

Spring

Ans. Default Bean scope in auto wiring is Singleton but Yes, that can be changed by specifying the Bean scope explicitly.

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Q215. What is MVC in GUI components ?

Design

Ans. The Model/View/Controller pattern, a strategy for dividing responsibility in a GUI component.

The model is the data for the component.

The view is the visual presentation of the component on the screen.

The controller is responsible for reacting to events by changing the model.

According to the MVC pattern, these responsibilities should be handled by different objects.

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Q216. Write SQL to get all members and the count of books they have checked out , even the ones that haven't checked out anything.

SQL

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Library Management System has always been the favorite question. This questions is asked irrespective of level.

Q217. Write data models and service end points for Library Management System ?

Architecture

Ans. Following could be the business sub domains or database schemas in such a system

1. Users / Members
2. Sourcing
3. Inventory Management
4. Operations

Following services end points could be there

1. Users - addNewUser ( put ), removeUser ( post )
2. Sourcing - addSupplier ( put ), removeSupplier ( post )
3. Inventory Management - getInventory ( get )
4. Operations - checkIn ( post ), checkout ( post )

There could be following Tables in Database

1. Users / Members - MEMBER, MEMBERSHIP_TYPE
2. Sourcing - SUPPLIER, SUPPLIER_PRODUCT, PRODUCT_REORDER_LEVELS
3. Inventory Management - INVENTORY,PRODUCTS
4. Operations - TRANSACTION

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Q218. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?

Algorithm

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Q219. Difference between static and dynamic binding ?

Design

Ans. Static binding happens at the compile time whereas dynamic binding happens at runtime.

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Q220. Draw uml for singleton pattern.

Design

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Q221. What is hashing ?

data structure

Ans. Hashing is a technique to calculate the hash code for any object

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Q222. Write Java code that would cause deadlock ?

Core Java

Ans. https://howtodoinjava.com/java/multi-threading/writing-a-deadlock-and-resolving-in-java/

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Q223. How Bitly shortens the URL ?

Web

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Q224. Design database schema for Facebook like application.

Database

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Q225. how is the internal code for the "volatile" implemented ?

Core Java

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Q226. Difference between sleep() and Wait()

Operating System

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Q227. What are the disadvantages of Design Patterns ?

Design Pattern

Ans. 1. Design patterns are abstraction heavy and hence sometimes creates memory and performance overheads.

2. Sometimes they create unnecessary complexity without much added advantage.

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Q228. Design a Program to clone an object and all it's children.

Design

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Q229. Why does an array need continuous memory locations and not Linked List ?

Data Structure

Ans. Array needs continuous memory location because it need to provide random access of it's elements which is not required for Linked List.

Array index acts as an offset from the base address and hence can retrieve the respective element using the expression Base Address + ( Index * Element Size ). This expression could only hold true if the elements are in continuous memory location.

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Q230. Why does an array index starts at 0 and not 1 ?

Data Structure

Ans. The array index starts with 0 because program locates an element using the expression ( BaseAddress + ( Index * size of array Element ), where index is used as an offset. As the starting address is actually the address of first element, the index of first element is used as 0 and so on.

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Q231. How will you implement your own custom hashmap and linkedlist ?

Data Structure

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Q232. What is optimistic and pessimistic locking ?

Operating System

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Q233. What is the use of @Import and @ImportResource anotations ?

Ans. The @Import annotation is used to import one or more @Configuration classes. This annotation provides the functionality equivalent to element in xml based configuration.

The @ImportResource annotation is used to import one or more XML configuration files.

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Q234. What is the difference between save() and persist() in hibernate ?

Hibernate

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Q235. What can we do if we need to retrieve Fibonacci value at a particular index faster ? Can we use Linked List ?

Data Structure

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Q236. What is the difference between subject and observable ?

RxJava

Ans. Subject has state, it keeps a list of observers. On the other hand, an Observable is really just a function that sets up observation. While Subjects are Observables, Subjects also implement an Observer interface.

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Q237. What is the difference between Observer and Observable ?

RxJava

Ans. Observable is emiting data and Observer is subscribing to catch the data

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Q238. What is the difference between Observer and Subscriber ?

Design

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Q239. Write a method that returns maximum depth of a tree ?

Algorithm

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Q240. What is the difference between pop and peek function of stack ?

Data Structure

Ans. pop method pulls the top element from the stack and then move the top to the next element whereas peek only get the top element but doesn't move the top.

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