Ensono Senior Engineer Interview Questions and Answers

Q1. General Java, springboot and oops
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Q1. Managerial round with Technical Lld and design related questions
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Q1. Client round technical LLD AND HLD questions
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Q1. HR discussion about salary and client details
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Live coding on my technology

Q1. Oops, solid principles, mvc vs mvvm vs mvp
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Q1. About ur self and recent achievements
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Q1. All Concurrent Utility Classes and their uses.
Ans. 
Concurrent Utility Classes provide support for concurrent programming in Java.
• ConcurrentHashMap: Thread-safe implementation of Map interface.

• CopyOnWriteArrayList: Thread-safe implementation of List interface.

• CountDownLatch: Synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.

• Semaphore: Controls the number of threads that can access a shared re...read more
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Q2. Basic SQL queries, mostly from Joins, Grouping
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Q3. Core Java, Java 8
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Q1. Difference between deep and shallow copy
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Deep copy creates a new object and recursively copies all nested objects, while shallow copy creates a new object and copies the references to nested objects.
• Deep copy duplicates all levels of the object hierarchy, ensuring that changes in the copied object do not affect the original object.

• Shallow copy only duplicates the top-level object, so changes in the copied object may affect the original object.

• Deep copy is mor...read more
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Q2. Ways to set values in form groups
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Ways to set values in form groups
• Use setValue() method to set values in form groups

• Use patchValue() method to set values in form groups

• Use reset() method to set values in form groups
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Q3. How to add dynamic component in view
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To add a dynamic component in a view, use a framework or library that supports dynamic rendering and component creation.
• Use a framework like React or Angular that allows for dynamic component creation

• Create a component factory or use a component resolver to dynamically create and render components

• Pass data or props to the dynamic component to customize its behavior

• Update the view or component tree to include the dynami...read more
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Q1. Internal working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of ke...read more
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Q2. What are the feature of jdk 8
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JDK 8 features include lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with sequences of elements efficiently.

• Default methods allow interfaces to have concrete methods.

• Date and Time API improvements.
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Q1. Java coding like count of alphabet after removing spaces.
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Q2. Sql query like show highest digit in all departments
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Retrieve the highest digit from employee IDs across all departments using SQL.
• Use the MAX() function to find the highest value in a column.

• Assuming a table structure: Employees(id INT, department VARCHAR).

• Example query: SELECT MAX(id) FROM Employees GROUP BY department;

• This will return the highest ID for each department.
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