OodlesTechnologies React Developer Interview Questions and Answers

Basic Programming questions will be there

Q1. Why Java is most secured!?
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Q2. Explain how Java program execute?
Ans. 
Java programs are executed by the Java Virtual Machine (JVM) which interprets and executes the bytecode generated by the Java compiler.
• Java source code is compiled into bytecode by the Java compiler

• The bytecode is platform-independent and can be executed on any device with a JVM

• The JVM interprets the bytecode and executes the instructions

• The JVM manages memory, handles exceptions, and provides other runtime services

• Exa...read more
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Q1. Communication and basic technical questions
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Difficulty level is medium

Q1. Medium about java and database
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Q1. Medium level - about project
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Q1. Why strings are immutable
Ans. 
Strings are immutable to ensure data integrity and security by preventing accidental or intentional modification.
• Immutable strings prevent accidental changes to data

• Enhances security by preventing data tampering

• Allows for efficient memory management
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Q2. Count the number of repeated words from the given string
Ans. 
Count the number of repeated words in a given string
• Split the string into words using a delimiter like space

• Create a hashmap to store word frequencies

• Iterate through the words and update the hashmap accordingly

• Count the number of words with frequency greater than 1
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Q1. What is abstract class?
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Abstract class is a class that cannot be instantiated and may contain abstract methods.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to inherit from
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Q2. What is sub query and Like operator?
Ans. 
A subquery is a query nested within another query, and the LIKE operator is used in SQL to search for a specified pattern in a column.
• A subquery is enclosed in parentheses and executed first before the main query.

• The result of a subquery can be used in comparison with the main query's result.

• The LIKE operator is used with the WHERE clause to search for a specified pattern in a column.

• The LIKE operator allows for wildca...read more
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Q1. Tell Me about Yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills and ability to work in a team

• Completed multiple projects including a web-based inventory management system
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Q2. Question From OOPS Consept
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Q1. Ask About Web Form
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Q2. SQL Question like Relation
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Q1. Java coding and development
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Q2. Db and development skills
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Q1. 1mcq 2techincal Hr 3.coding 4.manager round 5.hr
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Q2. Java basics,oops,collection,sql joins
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30 questions - aptitude+DSA +Java+Sql MCQ Questions

3 codes are given
1)if number is divisible by 15 then print "Foo" ,if number is divisible by 17 then print "bar" ,
if number is divisible by 15 and 17 then print "Foo Bar"
2) find third largest element of array
3)find factors of number

Q1. Explain Access modifiers public and default difference how to connect java to database 20 % of 25 superclass of all class sql query for delete last 10 rows from employee table
Ans. 
Access modifiers control the visibility and accessibility of classes, methods, and variables in Java.
• public access modifier allows a class, method, or variable to be accessed from any other class.

• default access modifier (no keyword) allows a class, method, or variable to be accessed only within the same package.

• To connect Java to a database, you can use JDBC (Java Database Connectivity) API.

• The superclass of all classe...read more
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Q1. Why you want join our company
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Q2. Why should hire you?
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