10+ Interview Questions and Answers

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

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

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

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

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

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

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

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

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