IDBI Intech Limited Team Lead Operations Interview Questions and Answers

Q1. Java 8 spring boot question
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Q2. Problem solving in java 8
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Q1. Based on the project you worked on
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Q2. Problem solving in java and ds
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Question related to dilr, aptitude were asked.

Easy level questions were asked

Q1. Remove duplicates from the list
Ans. 
Remove duplicates from an array of strings
• Create a new set to store unique values

• Iterate through the array and add each element to the set

• Convert the set back to an array to remove duplicates
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Q2. Inheritance related theoretical
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Q1. Explain OOPs concepts.
Ans. 
OOPs concepts are fundamental principles of object-oriented programming that help in designing and implementing software solutions.
• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes by inheriting properties and behaviors from existing classes.

• Polymorphism: Ability of an object to take on many forms.

• Abstraction: Hiding complex implementation details and providing a simplified ...read more
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Q2. Write a program to count occurance the letter in a string.
Ans. 
This program counts the occurrence of each letter in a given string.
• Use a HashMap to store the count of each letter.

• Iterate through the characters of the string and update the count in the HashMap.

• Finally, print the count of each letter.
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Q3. Write a SQL query to find third highest salary from employee table.
Ans. 
SQL query to find third highest salary from employee table.
• Use the ORDER BY clause to sort the salaries in descending order

• Use the LIMIT clause to limit the result to the third row

• Use a subquery to exclude the highest and second highest salaries
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Q4. Difference between Array and arraylist.
Ans. 
Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array has a fixed length, while ArrayList can grow dynamically.

• Array can store both primitive types and objects, while ArrayList can only store objects.

• Array uses square brackets [] for declaration, while ArrayList uses angle brackets <>.

• Array provides direct access to elements using index, while ArrayList provides metho...read more
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Q5. Explain working of Arraylist.
Ans. 
ArrayList is a dynamic array that can grow or shrink in size. It stores objects and provides methods for adding, removing, and accessing elements.
• ArrayList is part of the Java Collections Framework.

• It is implemented as a resizable array.

• Elements can be added using the add() method.

• Elements can be accessed using the get() method.

• Elements can be removed using the remove() method.

• The size() method returns the number of el...read more
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Q6. What is the default size of an arraylist.
Ans. 
The default size of an ArrayList is 10.
• The default initial capacity of an ArrayList is 10.

• If the number of elements exceeds the initial capacity, the ArrayList automatically increases its size.

• The capacity of an ArrayList can be increased manually using the ensureCapacity() method.
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Q7. Some questions from my resume about my previous experience.
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Q8. The interviewer was stupid and in my opinion they are just wasting your precious time. After the interview they don't provide any updates about the interview.
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Q1. Java 8, stream api, spring boot
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Q1. Java 8 ,stream api , Microservice, spring boot ,
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Q1. Stream api program,duplicate character find in given string how many way you can solve this problem, puzzles 25 horses
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Q1. How to improve performance issue your application,How to find proformance problem in system, How to join us
Ans. 
To improve performance in an application, identify performance problems and join our team.
• Analyze application code and identify bottlenecks

• Use profiling tools to measure performance

• Optimize database queries and improve indexing

• Implement caching mechanisms

• Upgrade hardware or infrastructure if necessary

• Join our team to collaborate on performance improvements
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Q1. Cycle sort based question
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Q2. Streams api, optional, lambda implementation
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Q3. Hashmap iteration ways
Ans. 
There are multiple ways to iterate over a HashMap in Java.
• Using keySet() and values() methods

• Using entrySet() method

• Using forEach() method with lambda expression
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Q4. Method overriding based code question -> guess the output
Ans. 
Method overriding in Java with code example
• Output will be 'Child class method' as the method in Child class overrides the method in Parent class

• Method overriding is a feature that allows a subclass to provide a specific implementation of a method that is already provided by its superclass

• The method in the subclass should have the same name, return type, and parameters as the method in the superclass
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Q5. Write API to save data
Ans. 
API to save data in Java
• Use HTTP POST method to send data to the server

• Create a RESTful endpoint to handle the data saving

• Validate the input data before saving it to the database
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Q1. Fetch all the duplicate values from an array
Ans. 
To fetch all duplicate values from an array of strings
• Iterate through the array and store each element in a HashSet

• If an element is already in the HashSet, it is a duplicate value

• Add the duplicate values to a separate list and return it
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Q2. Java 8 streams api
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