Oracle Java Developer Interview Questions, Process, and Tips

Round duration - 90 minutes
Round difficulty - Easy

Pretty easy questions.

Q1. 
Kth Smallest Element Problem Statement
You are provided with an array of integers ARR of size N and an integer K. Your task is to find and return the K-th smallest value present in the array. All elements...read more
Ans. 
Find the K-th smallest element in an array of distinct integers.
• Sort the array and return the element at index K-1.

• Use a min-heap to find the K-th smallest element efficiently.

• Implement quickselect algorithm for optimal performance.
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Round duration - 20 Minutes
Round difficulty - Easy

1 coding question

Q1. 
IP Address Formation from String
Given a string S consisting only of digits from 0 to 9, your task is to find all potential IP addresses that can be formed from S and list them in lexicographical order. I...read more
Ans. 
Given a string of digits, find all potential valid IP addresses that can be formed from it.
• Split the string into four parts and check if each part is a valid IP segment (0-255).

• Use backtracking to generate all possible combinations of valid IP addresses.

• Ensure that the IP address does not contain leading zeroes.

• Return the valid IP addresses in lexicographical order.
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Round duration - 45 Minutes
Round difficulty - Easy

Total Discussion on OS concepts

Q1. Can you explain the concepts related to memory management in operating systems?
Ans. 
Memory management in operating systems involves allocation, deallocation, and optimization of memory usage.
• Memory allocation: OS allocates memory to processes based on their requirements.

• Memory deallocation: OS frees up memory when it is no longer needed by a process.

• Memory optimization: OS optimizes memory usage through techniques like paging, segmentation, and virtual memory.

• Examples: Paging in which memory is divide...read more
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Round duration - 45 Minutes
Round difficulty - Easy

Easy in office environment

Q1. 
Find the Lone Set Bit
Your task is to identify the position of the only '1' bit in the binary representation of a given non-negative integer N. The representation contains exactly one '1' and the rest are...read more
Ans. 
Find the position of the lone '1' bit in the binary representation of a given non-negative integer.
• Iterate through the bits of the integer to find the position of the lone '1'.

• Use bitwise operations to check if there is exactly one '1' bit in the binary representation.

• Return the position of the lone '1' or -1 if there isn't exactly one '1'.
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