Codilar Technologies Associate Software Developer Interview Questions and Answers

It's online coding test

Q1. What is JS and how it works
Ans. 
JS stands for JavaScript, a high-level programming language used for creating interactive websites and web applications.
• JS is a client-side scripting language that runs in the browser.

• It is used to add interactivity, animations, and dynamic content to websites.

• JS can be used alongside HTML and CSS to create responsive and user-friendly web applications.

• Example: document.getElementById('demo').innerHTML = 'Hello World';
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It was online 60min test.

It was offline 30 min test.

Q1. Oops,dbms,css,html,dsa,java.
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Q2. It was very friendly .
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Q1. What are the 4 principles of oops?
Ans. 
The 4 principles of OOP are Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain components within a class, protecting the data.

• Abstraction hides complex implementation details and only shows the necessary features.

• Polymorphism allows objects to be treated as instances of their parent class.
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Q2. What is the difference between string buffer and string builder?
Ans. 
String buffer is synchronized and thread-safe, while string builder is not synchronized and faster.
• String buffer is synchronized, making it thread-safe for use in multi-threaded environments.

• String builder is not synchronized, providing better performance in single-threaded applications.

• String builder is faster than string buffer due to lack of synchronization overhead.

• Example: StringBuffer sb = new StringBuffer(); Str
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Q3. Why strings are immutable?
Ans. 
Strings are immutable in order to ensure data integrity and security.
• Immutable strings prevent accidental data modification, ensuring data integrity.

• Immutable strings enhance security by preventing unauthorized access or tampering.

• Immutable strings allow for more efficient memory management and optimization.

• Example: 'Hello' cannot be changed to 'Hella' directly, a new string must be created.
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Q4. What are the different types of exception in java?
Ans. 
There are two types of exceptions in Java: checked exceptions and unchecked exceptions.
• Checked exceptions are checked at compile time and must be handled using try-catch or throws keyword.

• Unchecked exceptions are not checked at compile time and include RuntimeException and its subclasses.

• Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException.

• Examples of unchecked exceptions include...read more
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Q5. Explain linear search algorithm.
Ans. 
Linear search is a simple searching algorithm that sequentially checks each element in a list until a match is found.
• Iterate through each element in the list

• Compare the current element with the target value

• Return the index if a match is found, otherwise return -1
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Q6. Difference between JDK jvm and jre
Ans. 
JDK includes JRE and development tools, while JRE includes only the Java Runtime Environment.
• JDK stands for Java Development Kit, which includes JRE and development tools like compilers and debuggers.

• JRE stands for Java Runtime Environment, which includes JVM and libraries necessary to run Java applications.

• JVM stands for Java Virtual Machine, which is responsible for executing Java bytecode.

• JDK is used for developing ...read more
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There were 45 questions in total: 20 questions on aptitude and 25 questions on basic C, C++, and Java.

Q1. TWO person was taking interview , one is HR AND TECHNICAL PERSON , THEY ASK ME TELL ME ABOUT YOUR SELF, WHAT ARE THE QUALITY OF TEAM LEADER, ARE YOU COMFORTABLE IF WE HIRE YOU AS A TESTER AND TECHNICAL ...read more
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Work well on loops and you will do well enough in the interview.

It was good

Q1. Some devs will ask questions
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Salary discusiion

Q1. Some coding based questions.
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Q2. Some technical question related theory.
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Q3. Some pattern based questions.
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They want you to solve pattern questions

Same complex patterns then first round

Q1. Basics of html sql, linear equations
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In 1st round they will provide a pattern question which you need to solve in 1 hour

Second round as well a coding test, which is a hard level of pattern coding test which you need to solve with in 45 minutes.

Q1. What is arrow function, write code to create a table (table structure will be provided).
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions are written using the '=>' syntax.

• They do not have their own 'this' keyword.

• They are best suited for non-method functions.

• Example: const add = (a, b) => a + b;
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Q2. Git commands, what are the steps to commit and push code in git.
Ans. 
To commit and push code in Git, you need to stage changes, commit them, and then push to the remote repository.
• Stage changes using 'git add ' or 'git add .' to add all changes

• Commit changes using 'git commit -m 'commit message''

• Push changes to remote repository using 'git push'
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Q3. Mathematics questions and many more.
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