Serrala Center Of Excellence Interview Questions and Answers

2 Questions - One Easy and One Medium

Q1. Some Basics of DBMS and one DSA related question
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Q1. Javascript question
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Q2. Few javascript coding questions
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Q1. Technical questions
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Q1. Basic oops concepts and our projects
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Q2. Basic strucutes of oops concpts and micro services
Ans. 
OOPs concepts include encapsulation, inheritance, polymorphism, and abstraction. Microservices are small, independent services that communicate with each other.
• OOPs concepts help in creating modular and reusable code.

• Encapsulation ensures that data is hidden and can only be accessed through defined methods.

• Inheritance allows a class to inherit properties and methods from a parent class.

• Polymorphism allows objects to ta...read more
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Q1. About the projects
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Q1. Puzzles and coding
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