IDFC FIRST Bank Java Developer Interview Questions and Answers

1)Buy and sell stock
2)2 sum
3) system design
4) Elastic search
5) deployment

Q1. Design immutable class
Ans. 
Immutable class is a class whose state cannot be modified after creation.
• Make all fields private and final

• Do not provide setter methods

• Ensure that any mutable objects within the class are also immutable
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Q2. Difference between lock and sync
Ans. 
Lock and sync are both mechanisms used in Java for thread synchronization, but they have different implementations and use cases.
• Lock is a low-level synchronization mechanism provided by the java.util.concurrent.locks package, while sync (synchronized keyword) is a high-level synchronization mechanism provided by Java.

• Lock provides more flexibility and control over synchronization compared to sync.

• Lock can be used to c...read more
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Q1. Oops, basic ,SQL ,ado
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Curd operation with SQL connectivity

Simple algorithm question about sorting

Q1. Algorith question about quick sort
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Q2. Nlonn run time of the sort
Ans. 
The time complexity of the quicksort algorithm is O(n log n).
• Quicksort has an average time complexity of O(n log n).

• The best case time complexity of quicksort is O(n log n) when the pivot element divides the array into two equal halves.

• The worst case time complexity of quicksort is O(n^2) when the pivot element is the smallest or largest element in the array.
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Ms office,Core Java , Tally , C,

In my Opinion,view , If you ask me, As far as I can see/I am Concerned , It seems to me that , I think /feel/reckon/ belive , If you want my option , What we have to decide

Q1. Kafka, webflux, Java multithreading
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Q1. LRU cache design
Ans. 
LRU cache design involves maintaining a cache with limited capacity and removing the least recently used item when the cache is full.
• Use a doubly linked list to maintain the order of items based on their usage.

• Implement a hash map for fast access to items in the cache.

• When a new item is accessed, move it to the front of the linked list to mark it as the most recently used.

• When the cache is full, remove the item at the ...read more
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Q2. Current project
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