Impetus Technologies Java Developer Interview Questions, Process, and Tips

Q1. 1.First Non repetitive character using steam. 2. Sort array of string on the basis of first character using steam. 3. Find longest word in string array.
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Q2. Annotations, core java, sql queries.
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6 question
3-Data Structure
3-SQL

Q1. All the core Subject Like CN, DBMS, SQL, OS, OOPs,
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Q2. Semaphors, Denormalization
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2-String Question
2- Linkedlist
1- Array

Paper/pan interview

Q1. Projects Related Discussion & some coding question
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Q2. Linkedlist hard question, Explain your project Design pattern
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Q1. Tell me about your self, Family background . Normal Interview Interviewer is cool
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Q1. Create stack using queue
Ans. 
Implementing a stack using two queues to achieve LIFO behavior.
• Use two queues: queue1 and queue2.

• For push operation, enqueue the element to queue1.

• For pop operation, dequeue all elements from queue1 to queue2 except the last one, then dequeue the last element from queue1.

• Swap the names of queue1 and queue2 after the pop operation.

• Example: Push(1), Push(2), Pop() returns 2.
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Q2. What is Singleton class in java
Ans. 
A Singleton class ensures a class has only one instance and provides a global point of access to it.
• Singleton pattern restricts instantiation of a class to one object.

• It is commonly used for logging, driver objects, caching, and thread pools.

• Example: Using a private constructor and a static method to get the instance.

• Thread-safe Singleton can be implemented using synchronized methods or double-checked locking.
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