IDBI Intech Limited Java Developer Interview Questions and Answers

Five MCQs, 2 moderate-level+1 hard level coding,2 SQL queries.

Hard-level 6 Data structure based questions to write the code.

Q1. Flattenedarray code
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Q2. Nested array objects to single array.
Ans. 
Convert nested array objects to single array of strings.
• Iterate through the nested arrays and flatten them into a single array.

• Use recursion to handle multiple levels of nesting.

• Example: [["a", "b"], ["c", "d"]] -> ["a", "b", "c", "d"]
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Q1. Reverse the list node with head node having multiple values.
Ans. 
Reverse a list node with multiple values in Java.
• Create a new linked list to store the reversed nodes.

• Traverse the original list and add each node to the front of the new list.

• Update the head node of the original list to point to the new list.
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Q2. Hard-level string question to write the code.
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Q1. Advanced Java and database
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Q2. Advanced Data structures
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Duration is 1 hr and topic is core java

Q1. What i sth OOPS
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Q2. What i s abstract class
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Q1. They asked some core Java Concepts,String,Java 8,SpringBoot Architecture,Stream API code
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Q1. Explain Sonarqube, different type of code smells, and how its implemented in CI CD
Ans. 
Sonarqube is a static code analysis tool used to detect code smells and bugs in code. It is integrated into CI/CD pipelines for continuous code quality checks.
• Sonarqube is a static code analysis tool that identifies code smells, bugs, and security vulnerabilities in code.

• Code smells are common programming issues that may indicate a deeper problem in the code. Examples include duplicated code, long methods, and complex ...read more
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Q2. Write a program to find the numbers divisble by 3 in a string - and reverse its indexes eg : - input : String s = "123456789" output String s = "129456783"
Ans. 
Program to find numbers divisible by 3 in a string and reverse their indexes.
• Iterate through the string and check if each character is a number divisible by 3.

• Store the divisible numbers in an array and reverse their indexes.

• Join the array back into a string and return the result.
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Q1. Java 8 features
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Q2. Junit code writing
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Q1. Reason for job change
Ans. 
Seeking new challenges and growth opportunities in a dynamic environment.
• Desire for professional growth

• Seeking new challenges

• Interested in a more dynamic work environment
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Q2. Past experience
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Q1. Difference between ArrayList and LinkedList?
Ans. 
ArrayList is implemented as a resizable array, while LinkedList is implemented as a doubly linked list.
• ArrayList provides fast random access, LinkedList provides fast insertion and deletion.

• ArrayList uses more memory as it needs to allocate a fixed size array, LinkedList uses more memory for storing references to the next and previous elements.

• Example: ArrayList is better for scenarios where random access is required, ...read more
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Q2. Difference between HashMap and HashTable?
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is faster than HashTable as it is non-synchronized, but HashTable is preferred in multi...read more
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Q1. Java8 coding to filter the vowels
Ans. 
Using Java8 to filter vowels from an array of strings
• Use Java8 stream and filter to iterate through each string in the array

• Use a lambda expression to check if each character is a vowel

• Collect the filtered strings into a new array
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Q2. Java8, Multi Threading, Hibernate, JPA
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30 multiple choice questions

Two coding questions

Q1. Oops questions like main principles of oops
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Q1. Deep in project
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Q1. Self intro, family background,some hr questions
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