Zazz IT Solutions Senior Backend Developer Interview Questions and Answers

Q1. How make a queue using a stack
Ans. 
To implement a queue using a stack, use two stacks and simulate the queue operations.
• Use two stacks, one for enqueue operation and one for dequeue operation.

• For enqueue operation, simply push elements onto the stack used for enqueueing.

• For dequeue operation, if the dequeue stack is empty, pop all elements from enqueue stack and push onto dequeue stack.

• Then pop from the dequeue stack to simulate dequeue operation.
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Q2. Create a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Initialize a head pointer to null

• Add nodes by updating next pointers

• Traverse the list by following next pointers
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Coding questions about array and string.

Cosing questions about sql and ds.

Q1. Personal and behavioral questions.
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Easy to medium leetcode questions

2 questions of DSA medium to hard

Basic coding questions

Q1. Question about current project.
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Q2. Basic Java, spring questions
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Q1. Basic HR questions
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Basic Aptitude questions were there which I think anyone can clear.

2 easy level programming questions were asked.

Q1. Introduction, background, interest, vision.
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Coding test consists of easy to medium difficulty problems.

Q1. HashMap in java
Ans. 
HashMap in Java is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap is part of the Java Collections framework.

• It uses hashing to store key-value pairs, allowing for O(1) retrieval time on average.

• Keys in a HashMap must be unique, but values can be duplicated.

• Example: HashMap map = new HashMap<>(); map.put("key1", 1); int value = map.get("key1");
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It was mostly on JavaScript

Q1. Focused on react
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Q1. Brief about project
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