eMpulse Global Senior Java Developer Interview Questions and Answers

Hacker Rank Coding for simple two program

1 question from DSA,
Find no of ways to climb the stairs.
Java collections, Java 8 features and few Spring based aptitude questions

Q1. Find peak element in rotated sorted array
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Q2. Print the pascal triangle pattern
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Q1. Design Custom Hashmap
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Q2. Find sum elements which will appear from left view of Binary tree
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Q1. Question based on current project and experience. Some technical questions about Gradient descent(because mentioned resume)
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Q1. Experience and Expected CTC
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Q1. Java 8 features
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Q2. @transactional
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Q1. Sql questions based on queries and scenarios
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Q2. Microservices architecture
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Q3. Design patterns
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Q1. Shallow copy and deep copy
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Q2. What is Pure component
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A Pure component is a component in React that does not have any state or lifecycle methods, resulting in improved performance.
• Pure components are used to prevent unnecessary re-renders in React applications.

• Pure components implement shouldComponentUpdate method with shallow comparison of props and state.

• Examples of Pure components include functional components and class components that extend PureComponent class.
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Q1. Uikit explaination
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Q2. Model classes with uikit
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Model classes in UIKit are used to represent data in an application's user interface.
• Model classes in UIKit typically subclass NSObject and are used to store and manage data for views.

• They can include properties to represent different data fields, methods to manipulate the data, and sometimes protocols for delegation.

• For example, a model class for a user profile in a social media app might have properties like username...read more
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Project related questions

Q1. How is GIL and how python handle multi threading
Ans. 
GIL stands for Global Interpreter Lock in Python, which limits execution of multiple threads at once.
• GIL is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes at once.

• Due to GIL, Python threads are not suitable for CPU-bound tasks but are still useful for I/O-bound tasks.

• To handle multi-threading in Python, one can use multiprocessing module or asynchronous progr...read more
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Q2. Explain How React works under the hood.
Ans. 
React uses a virtual DOM to efficiently update the actual DOM based on changes in state or props.
• React creates a virtual DOM representation of the actual DOM.

• When state or props change, React compares the virtual DOM with the actual DOM to determine the minimal set of changes needed.

• React then updates the actual DOM efficiently to reflect the changes.
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Q1. Tell me about a project you have worked on
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Good number of questions on permutations, english etc

Q1. What do you know about this company?
Ans. 
The company is a leading software development firm specializing in creating innovative solutions for various industries.
• Specializes in creating innovative software solutions

• Works with clients from various industries

• Known for high-quality and reliable products

• Has a strong team of experienced developers

• Focuses on staying up-to-date with the latest technologies
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