Serosoft Solutions Java Developer Interview Questions and Answers for Freshers

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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Q1. Print unique numbers in list
Ans. 
Print unique numbers in list
• Iterate through the list and store each number in a set to keep track of unique numbers

• Print out the numbers in the set to display the unique numbers
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Normal apti questions test is easy

Opps,java basics, question on array and string as an array

Q1. Machine round collection framework pattern design array mid term SIngleton design pattern
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Q1. More dmbs and sql questions salary
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Aptitude test was easy but difficult

Q1. Technical questions linked list
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Q2. Array binary search Dp
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Round duration - 30 minutes
Round difficulty - Medium

It was in the morning around 9:00Am-9:30AM. Platform used for this round was hacerrank. Questions were of moderate to difficult level.

Q1. Count subarrays with Given XOR
Given an array of integers ‘ARR’ and an integer ‘X’, you are supposed to find the number of subarrays of 'ARR' which have bitwise XOR of the elements equal to 'X&...read more
Ans. Brute Force
A simple method is to traverse through each subarray to find the total number of subarrays with the XOR of all elements present in the subarray equal to X.
 
To obtain the total number of rounds after each operation, we will maintain a variable ans, which stores the total number of subarrays. We will iterate the variable index from 0 to N - 1 and in each iteration, we will iterate pos from index to N - 1....read more
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Q2. Distinct Characters
Given a string “STR”, you need to return all the possible non-empty subsequences with distinct characters. You can return the strings in any order.
Note:
If the same string can be gen...read more
Ans. Brute Force
We can generate all possible subsequences of the string, and for each subsequence check if it contains any character multiple times. If it doesn’t contain any character multiple times, append it into our result.
 
Algorithm:
 
• Create a variable “mask”, and iterate from 0 till 2 ^ |STR| - 1.
  • For each value of “mask”, if the ith bit in “mask” is set, it means we are including the ith character of “STR” in...read more
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Round duration - 15 minutes
Round difficulty - Easy

It was in the night around 8:00PM-8:20PM. Interviewer was very calm in questioning. Platform used for this round was Skype and the questions focused more on personality rather than total.

Q1. Basic HR Questions
What do you know about our company?
Who is your role model?
Ans. 
Tip 1 : Your answer has to be short, crisp and to the point. Here are some possible high-impact answers to help you leave a great impression.
Tip 2 : Don’t fall into the interviewer’s trap. This question is shot at you to check your confidence level.
 
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