Xtend Technologies Interview Questions and Answers

Q1. What data structure is used to implement a priority queue?
Ans. 
Binary heap is used to implement a priority queue.
• Binary heap is a complete binary tree where each node has a value greater than or equal to its children.

• It can be implemented using arrays, where the parent of node at index i is at index (i-1)/2.

• Insertion and deletion operations have time complexity of O(log n) in a binary heap.
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Q2. How many trees will a binary tree have?
Ans. 
A binary tree can have any number of nodes, but the maximum number of trees with n nodes is 2^n.
• A binary tree can have 0 nodes, 1 node, 2 nodes, or any number of nodes.

• The maximum number of binary trees with n nodes is 2^n.

• For example, a binary tree with 3 nodes can have up to 8 different structures.
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Q1. SQL Query to return the second highest marks in a student database
Ans. 
Use a SQL query to find the second highest marks in a student database.
• Use the ORDER BY clause to sort the marks in descending order

• Use the LIMIT clause to limit the result to the second row
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Q2. Program to check if two strings are anagrams
Ans. 
Program to check if two strings are anagrams
• Create a function that takes in two strings as input

• Remove any spaces and convert both strings to lowercase for consistency

• Sort the characters in both strings and compare if they are equal to determine if they are anagrams

• Example: 'listen' and 'silent' are anagrams
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Q1. How Performance of application can be improved
Ans. 
Performance of an application can be improved by optimizing code, using efficient algorithms, caching data, and scaling resources.
• Optimize code by reducing unnecessary loops, improving database queries, and minimizing memory usage

• Use efficient algorithms like binary search instead of linear search for large datasets

• Implement caching mechanisms to store frequently accessed data and reduce database calls

• Scale resources b...read more
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Q1. SQL Questions - Constraints- how to optimize long SQL query without changing the output
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Q1. Introduce Yourself
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Q2. What is current designation
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Q1. What is your design process.
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Q2. How do you work with developer push-back?
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Q3. How do you overcome personal bias in user research?
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Make a autobiography app

Q1. Share your working experience
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Q2. Why are you leaving current firm?
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Q3. How do you percieve the design systems
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Q1. What you know about serialization
Ans. 
Serialization is the process of converting an object into a format that can be easily stored or transmitted.
• Serialization is used in programming to save the state of an object so that it can be recreated later.

• It is commonly used in data storage, network communication, and in the implementation of remote procedure calls.

• Examples of serialization formats include JSON, XML, and Protocol Buffers.
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Q2. Where you see yourself in next 5 years
Ans. 
In the next 5 years, I see myself advancing in my career, taking on more responsibilities, and potentially leading a team.
• Continuing to develop my skills and expertise in my field

• Seeking opportunities for growth and advancement within the company

• Possibly pursuing further education or certifications to enhance my knowledge

• Taking on leadership roles and mentoring junior team members

• Working towards achieving specific care
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It was Machine test, i had to make a project and connect it to Database and submit details in database table from form.

Q1. Technical verbal Interview, question were related to JavaScript, Json, JQuery, and how to perform click and other event on click, on change etc, and how to get text content entered in text box, mostly rel...read more
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Q2. What is Collection Framework?
Ans. 
Collection Framework is a unified architecture for representing and manipulating collections of objects in Java.
• It provides interfaces (List, Set, Queue, etc.) and classes (ArrayList, HashSet, PriorityQueue, etc.) to store and manipulate groups of objects.

• Collections can be easily sorted, searched, and iterated using methods provided by the Collection Framework.

• Example: ArrayList is a class that implements the List int...read more
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Q3. What is RestApi?
Ans. 
RestApi is a set of rules and conventions for building and interacting with web services using HTTP methods.
• RestApi stands for Representational State Transfer Application Programming Interface.

• It allows communication between different software systems over the internet.

• RestApi uses standard HTTP methods like GET, POST, PUT, DELETE for data manipulation.

• JSON or XML formats are commonly used for data exchange in RestApi.

• ...read more
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Q4. How to add one ArrayList object to another, which method is used to achieve this. Ans:- By using addAll() Method

Ans. 

The addAll() method is used to add all elements of one ArrayList to another.

• Use the addAll() method to add all elements of one ArrayList to another

• Syntax: list1.addAll(list2);

• Example: ArrayList list1 = new ArrayList<>(); list1.addAll(Arrays.asList(1, 2, 3));

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