Ennexa Technologies Junior Software Engineer Interview Questions and Answers

Q1. Angular basic to advance.
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Q2. Js code remove the duplicate from array.
Ans. 
Use Set to remove duplicates from array of strings in JavaScript.
• Create a Set from the array to automatically remove duplicates.

• Convert the Set back to an array to get the unique values.

• Example: const array = ['apple', 'banana', 'apple']; const uniqueArray = [...new Set(array)];
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Aptitude test includes number series, profit and loss, percentage, train problems

Q1. About SQL queries and database
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Q2. About object oriented programming, pointers, arrays, linked list
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Q1. Does platform independent in JAVA?
Ans. 
Yes, Java is platform independent due to its ability to compile code into bytecode that can run on any platform with a Java Virtual Machine (JVM).
• Java code is compiled into bytecode, which can run on any platform with a JVM.

• The JVM acts as an intermediary between the Java code and the underlying platform.

• This allows Java programs to be written once and run on any platform without modification.
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Q2. Do you Know about OOPS?
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OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.
• OOPS focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Examples of OOPS languages include Java, C++, and Python.
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Easy question contains coding aptitude and java basic question

Q1. String reverse with different approaches
Ans. 
Reverse a string using different approaches
• Use built-in functions like reverse() or StringBuilder.reverse()

• Iterate through the string and build a new string in reverse order

• Use recursion to reverse the string
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Q2. Java basic to advance and resume based question
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Q1. Oops in cpp programing
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In C++, 'oops' typically refers to Object-Oriented Programming concepts and principles.
• Oops in C++ refers to Object-Oriented Programming concepts like classes, objects, inheritance, polymorphism, and encapsulation.

• Common mistakes in C++ programming include memory leaks, null pointer dereferencing, and improper use of pointers.

• Example: Forgetting to delete dynamically allocated memory can lead to memory leaks in C++ pro
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Q2. What is generic in cpp
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Generics in C++ allow for writing generic algorithms and data structures that work with any data type.
• Generics in C++ are implemented using templates, which allow for writing code that can work with any data type.

• Templates are a way to create generic functions or classes without specifying the data type.

• For example, a generic function to find the maximum of two values can be written using templates.

• Another example is a...read more
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Q1. What is oops concepts?
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Object-oriented programming concepts that focus on objects and classes for code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details an...read more
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Q2. Write a programof palindrome of string?
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A program to check if a given string is a palindrome or not.
• Create a function that takes a string as input.

• Reverse the string and compare it with the original string.

• If they are the same, then the string is a palindrome.

• Examples: 'madam' is a palindrome, 'hello' is not a palindrome.
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Q1. Define the Oops pillars.
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Oops pillars are the four main principles of object-oriented programming: Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

• Polymorphism: A
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Q2. Define 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 uses an array to store key-value pairs.

• Keys are hashed to determine the index where the value will be stored.

• Collision handling techniques like chaining or open addressing are used to deal with multiple keys hashing to the same index.

• Retrieving a value involves hashing the key to find the index and ...read more
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Q3. Define multi threading & synchronisation
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Multithreading is the ability of a CPU to execute multiple threads concurrently, while synchronization is the coordination of multiple threads to ensure data consistency.
• Multithreading allows multiple threads to run concurrently on a single CPU core.

• Synchronization is used to coordinate access to shared resources among multiple threads.

• Examples of synchronization mechanisms include locks, semaphores, and monitors.

• Multi...read more
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Q4. Difference between abstract class & functional interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while functional interface can have only one abstract method.
• Abstract class can have constructors, fields, and methods, while functional interface can only have one abstract method.

• Abstract class can have abstract and non-abstract methods, while functional interface can only have one abstract method.

• Abstract class can provide default implementations for me...read more
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