OodlesTechnologies Interview Questions and Answers

Q1. What is marker interface
Ans. 
A marker interface is an empty interface used to indicate a specific property or behavior in Java without defining methods.
• Definition: A marker interface does not contain any methods or fields; it serves as a tagging mechanism.

• Example: The Serializable interface in Java is a marker interface that indicates an object can be serialized.

• Purpose: Marker interfaces are used to provide metadata about a class, allowing the Ja...read more
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Q2. Given a string remove all the duplicate character from it
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Remove duplicate characters from a string while preserving the original order of characters.
• Use a set to track seen characters and a list to build the result.

• Iterate through the string, adding characters to the result if they haven't been seen.

• Example: Input: 'hello', Output: 'helo'.

• Example: Input: 'programming', Output: 'progamin'.
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Q3. Write program to calculate fibonnaci number
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A Fibonacci number is a number in the Fibonacci sequence, where each number is the sum of the two preceding ones.
• Definition: The Fibonacci sequence starts with 0 and 1, and each subsequent number is the sum of the previous two.

• Formula: F(n) = F(n-1) + F(n-2) with base cases F(0) = 0 and F(1) = 1.

• Example: The first 10 Fibonacci numbers are 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.

• Implementation: Fibonacci numbers can be calculat...read more
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Q1. Asked about previous experience
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Q2. Why you want to change the job
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Seeking new challenges and growth opportunities in a different environment.
• Desire for professional growth and development

• Looking for new challenges and experiences

• Seeking a better work-life balance

• Interested in exploring different industries or sectors
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Q1. What is sql and its uses.
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SQL is a programming language used for managing and manipulating relational databases.
• SQL stands for Structured Query Language

• It is used to retrieve and manipulate data in relational databases

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE

• Examples of SQL database systems include MySQL, PostgreSQL, Oracle
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Total 30 mcq which includes java pseudo code, SQL and aptitude.

Gave me a simple coding question, in which I had to find duplicate characters in the string.

Q1. They started with an introduction, asked some questions about my project and then told me to write Fibonacci series using recursion and some question of Sql Joins.
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MCQ java technical questions

Q1. Reverse every word of the string
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Q2. Write down a function to remove duplicate from the array
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Q1. Salary discussion and negotiation
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Q1. Create a function to find out if a given number is prime or not.
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Function to determine if a number is prime or not.
• Check if the number is less than 2, return False if so

• Iterate from 2 to the square root of the number, checking for divisibility

• If no divisors found, return True (number is prime)
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Q2. Create a function to find out the least repeating consecutive character in a string.
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Create a function to find the least repeating consecutive character in a string.
• Iterate through the string and keep track of consecutive characters and their counts

• Find the character with the least count of consecutive repetitions

• Return the character with the least count
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Q3. Give the difference between call by value and call by reference.
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Call by value passes a copy of the variable's value, while call by reference passes a reference to the variable's memory location.
• Call by value passes a copy of the variable's value, so changes made to the parameter inside the function do not affect the original variable.

• Call by reference passes a reference to the variable's memory location, so changes made to the parameter inside the function affect the original varia...read more
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