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CMS IT Services Software Engineer Interview Questions and Answers

Updated 18 Jun 2024

Q1. What is different hasmap and has table

Ans.

HashMap and HashTable are both data structures in Java used to store key-value pairs, but HashMap is not synchronized and allows null keys/values, while HashTable is synchronized and does not allow null keys/values.

  • HashMap is not synchronized, while HashTable is synchronized

  • HashMap allows null keys and values, while HashTable does not

  • HashMap is faster than HashTable

  • HashMap is part of Java Collections framework, while HashTable is a legacy class

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Q2. What is string buffer

Ans.

String buffer is a data structure that stores and manipulates a sequence of characters.

  • String buffer is mutable, meaning it can be modified after creation.

  • It is often used for efficient string manipulation, such as concatenation or appending.

  • Examples include StringBuffer class in Java and StringBuilder class in C#.

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Q3. What is the exception

Ans.

An exception is an event that disrupts the normal flow of a program's execution.

  • Exceptions are used to handle errors and other exceptional events in software.

  • They can be caught and handled using try-catch blocks.

  • Examples of exceptions include NullPointerException, ArrayIndexOutOfBoundsException, and IOException.

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Q4. What id oops and its advantages

Ans.

OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

  • Advantages of OOPs include code reusability, modularity, flexibility, and easier maintenance.

  • Encapsulation allows data hiding and protection, reducing complexity and increasing security.

  • Inheritance enables code reuse and promotes the creation of hierarchical relationships between classes.

  • Polymorphism allows objects to be treated as instances of their parent class, providi...read more

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Q5. What is php and its advantages

Ans.

PHP is a server-side scripting language used for web development.

  • PHP stands for Hypertext Preprocessor.

  • It is open source and widely used for creating dynamic web pages.

  • Advantages include easy integration with HTML, support for various databases, and compatibility with different operating systems.

  • PHP code can be embedded within HTML code, making it easy to work with web content.

  • Popular websites like Facebook and WordPress are built using PHP.

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Q6. What is jquery and JavaScript

Ans.

jQuery is a JavaScript library that simplifies HTML document traversal and manipulation, event handling, and animation.

  • jQuery is a fast, small, and feature-rich JavaScript library.

  • It makes things like HTML document traversal and manipulation, event handling, and animation much simpler with an easy-to-use API.

  • jQuery simplifies common tasks like AJAX calls and DOM manipulation.

  • JavaScript is a programming language that enables interactive web pages and dynamic content.

  • It is comm...read more

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