Oracle Software Engineer Interview Questions, Process, and Tips

First round was mix of aptitude, cs fundamentals, quant, programming and flow chart based mcq.
Note-
1- There was timer for each sections and subsections.
2- Once you move ahead of a ques then u cant go back on previous ques.

Data Structure & Algorithm based ques.
Toughness- Leetcode medium.
Few ques on dbms in the end.
Note- Complete code from scratch to be written.

Data Structure &Algorithm based ques.
Toughness- Leetcode medium.
In the end, project was discussed briefly.
Note- Complete code from scratch.

Coding + HR combined.
Many coding ques were ask and then ques were manipulated to come up with new logic.
Here, only pseudo code based discussion.
In the end, entire resume was discussed from college, project, future goals and hr based ques.

About Java

It consists of 4 section , quants verbal reasoning and data structures were asked

Q1. Delete nth node from end of linked list
Ans. 
Delete nth node from end of linked list
• Use two pointers, one to traverse the list and another to keep track of the nth node from the end

• Once the nth node is reached, move both pointers until the end of the list

• Delete the node pointed by the second pointer
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Q2. Rotate a linked list
Ans. 
Rotate a linked list
• Create a new node and make it the head

• Traverse the list to find the tail and connect it to the old head

• Update the tail to point to null

• Handle edge cases like empty list or rotating by 0 positions
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Q1. Where do you see yourself in 5 years?
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Q2. Tell me about yourself.
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Q1. Core Java basics ,opps concepts
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Q2. Web development framework of jaba
Ans. 
Java web development frameworks include Spring, Hibernate, Struts, and Play.
• Popular Java web development frameworks include Spring, Hibernate, Struts, and Play

• Spring is a widely used framework for building enterprise Java applications

• Hibernate is an ORM framework for mapping Java objects to database tables

• Struts is a framework for building web applications using the MVC design pattern

• Play is a lightweight web framework
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Round duration - 50 minutes
Round difficulty - Medium

Round duration - 40 minutes
Round difficulty - Medium

1. How to read text file and show words of file in sorted order by their frequency.

2. Gave me a puzzle: three jars with fruits are incorrectly labeled, find the minimum number of trial to correctly label them, given that in one trial you can take fruit out from a jar.

3. What is a prime number? How to find a prime number? 

4. Asked me what is my hobby.

Q1. 
Minimum Number of Platforms Needed Problem Statement
You are given the arrival and departure times of N trains at a railway station for a particular day. Your task is to determine the minimum number of pl...read more
Ans. 
The task is to determine the minimum number of platforms needed at a railway station based on arrival and departure times of trains.
• Sort the arrival and departure times in ascending order.

• Use two pointers to track overlapping schedules.

• Increment platform count when a new train arrives before the previous one departs.
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Round duration - 30 minutes
Round difficulty - Medium

1. Gave me one puzzle: 1000 light bulbs switched on/off by 1000 persons passing by
2. What is event driven programming? ( was not able to answer )
3. What is micro services? ( was not able to answer )
4. What improvement do you feel after leaving job and joining masters?

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string word by word, removing leading/trailing spaces and extra spaces between words.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between
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