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10+ Interview Questions and Answers

Updated 9 Oct 2024

Q1. Java HashMap internals ? what happend when hashcode returns always 1 ?

Ans.

Explaining Java HashMap internals and behavior when hashcode always returns 1.

  • HashMap uses hashcode to calculate the index of the bucket where the key-value pair will be stored.

  • If hashcode always returns 1, all key-value pairs will be stored in the same bucket resulting in poor performance.

  • In this case, HashMap will use a linked list to store multiple key-value pairs in the same bucket.

  • Retrieving a value from a HashMap with a poor hashcode function will result in a linear sea...read more

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Q2. Find common ancestor of 2 nodes in a binary tree ?

Ans.

Find common ancestor of 2 nodes in a binary tree

  • Traverse the tree from root to both nodes and store the paths

  • Compare the paths to find the last common node

  • Use recursion to traverse the tree and find the common ancestor

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Q3. Sort a binary array of 0 1 0 0 1 0 1 1 1 0 1 0 0 1 0 0 0 1 0 ? Optimise the code ?

Ans.

Sort a binary array of 0s and 1s and optimize the code.

  • Use two pointers approach to swap 0s and 1s

  • Avoid using sorting algorithms like bubble sort or selection sort

  • Use a single loop to traverse the array and swap elements

  • Use XOR operation to swap elements

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Q4. Find min element of stack in O(1) time ?

Ans.

To find the minimum element of a stack in O(1) time, maintain a separate stack for minimum values.

  • Create a separate stack to store minimum values

  • Push the minimum value onto the minimum stack every time a new value is pushed onto the main stack

  • Pop the minimum stack every time the main stack pops a value

  • The top of the minimum stack will always contain the minimum value

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Q5. Futer goal, how to handle VIP users , hardware and software issues for mac & windows systems

Ans.

VIP users require special attention for hardware and software issues on both Mac and Windows systems.

  • Create a dedicated support team for VIP users

  • Establish a priority system for VIP tickets

  • Provide personalized support and communication

  • Ensure quick response times and resolution

  • Implement proactive monitoring and maintenance

  • Maintain up-to-date knowledge of Mac and Windows systems

  • Collaborate with vendors and other IT teams for complex issues

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Q6. How to handle senior resources who are anti-agilist

Ans.

Address their concerns and involve them in the process to gain their buy-in.

  • Listen to their concerns and understand their perspective.

  • Explain the benefits of agile and how it can improve their work.

  • Involve them in the agile process and give them ownership of their tasks.

  • Provide training and support to help them adapt to the new way of working.

  • Celebrate their successes and recognize their contributions to the team.

  • Be patient and persistent in promoting the agile mindset.

  • Consid...read more

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Q7. What are the changes in Scrum Guide

Ans.

The Scrum Guide was updated in November 2020 with changes to the framework.

  • Product Goal added as a new artifact

  • Daily Scrum questions changed to focus on progress towards Sprint Goal

  • Sprint Review includes discussion of the Product Goal

  • Sprint Retrospective includes a section on improving the way of working

  • Role of Development Team renamed to Development

  • Role of Development Team expanded to include accountability for quality

  • Role of Product Owner expanded to include accountability ...read more

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Q8. scrum guide changes from the last version

Ans.

Scrum Guide changes were made in November 2020

  • Product Goal added as a new artifact

  • Commitment to Sprint Goal added

  • Development Team renamed to Developers

  • Daily Scrum questions changed

  • Time-box for Sprint Planning increased

  • Retrospective improvements suggested

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Q9. Explain projects and methodologies

Ans.

Projects and methodologies are the backbone of software development. They define the approach and process of software development.

  • Projects are the specific tasks or goals that need to be accomplished within a defined timeline and budget.

  • Methodologies are the set of principles, practices, and procedures used to manage a project from start to finish.

  • Agile, Waterfall, and DevOps are some of the popular methodologies used in software development.

  • Each methodology has its own advan...read more

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Q10. what is html, css?

Ans.

HTML and CSS are languages used for creating and styling web pages.

  • HTML stands for HyperText Markup Language and is used for creating the structure of a web page.

  • CSS stands for Cascading Style Sheets and is used for styling the elements on a web page.

  • HTML uses tags to define different elements like headings, paragraphs, images, and links.

  • CSS is used to control the layout, colors, fonts, and other visual aspects of a web page.

  • Both HTML and CSS are essential for creating visual...read more

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