Interview Experience at Oracle for Software Developer Position

Interview Process Overview
Initial Recruiter Contact

• Date: 3rd week of July 2024
• I received an email from the recruiter regarding a Java Developer position, along with a link to the online assessment (OA).

Online Assessment

• Date of Completion: 19th July 2024
• I completed the assessment on the given date and received a confirmation email on 20th July 2024, inviting me to an in-person interview.

Round 1: On-site Interview (Technical Round)
Interviewers: Two interviewers were present
This round focused on fundamental topics, including Java basics, Object-Oriented Programming (OOP), Data Structures and Algorithms (DSA), Puzzles, and SQL.

Java and OOP Questions:

• Why does Java have wrapper classes for primitive data types?
• I was asked to analyze and explain the output of the following code:

public class Main(){
	public static void main(String[] arg){
		String name = "Name";
		String name1 = new String("Name");
		system.out.print(name == name1);
		return;
	}
};

• Further questions on OOP covered inheritance, different types of inheritance, and whether Java supports multiple inheritance.
• Questions on abstract classes and several code analysis tasks were presented, including the following code samples:

	public class Main(){
	int a = 20;
	public static void main(String[] arg){
		system.out.print(a);
		return;
	}
};

	class A{
		public void fun(){
			System.out.print("Hello from A");
		}
	};
	
	class B extencs A{
		public void fun(){
			System.out.print("Hello from B");
		}
		public void fun1(){
			System.out.print("Hello from function1");
			return;
		}
	};
	
	
	public class Main(){
	public static void main(String[] arg){
		// In the discussion they have added each line of code and ask output.
		A obj = new A();
		B obj1 = new B();
		obj.fun();
		obj1.fun();
		obj1.fun1();
		obj = new B();
		obj.fun();
		obj.fun1();
		obj1 = new A();
		obj1.fun();
		obj1.fun1();
		return;
	}

	abstract class A{
		public abstract void fun();
		public static void fun1(){
			System.out.print("Hello world!");
		}
	};

	public class Main(){
	public static void main(String[] arg){
		A.fun1();
		return;
	}
};

DSA Questions:
The he moves to DSA rounds and ask me two question.

1. Maximum Sum Subarray: The interviewer noted my familiarity with the problem and asked me to explain the approach to confirm my understanding.
2. Median of an Array of Integers: Initially, I proposed sorting the array, but when they added that the integers were received as a stream, I suggested an insertion sort and then refined it using two priority queues.

SQL Questions:
Based on my project experience (YouTube clone), the interviewers presented a scenario involving user, video, and comment tables. They asked me to write a query to retrieve the name of the user whose video had the maximum number of comments.

Puzzles:

They ask me 4 puzzles.

1. 3 Bulbs and 3 Switches from gfg.
2. 8 balls problem from gfg.
3. 10 Coins Puzzle from gfg.
4. The final puzzle involved a scenario with five houses and a thief who changes houses daily, moving to an adjacent house. I was asked to devise the optimal strategy for the police to catch the thief and calculate the minimum number of days required.

Round 2: On-site Interview (Technical Round)
Technical Round
Interviewers: One interviewer was present.
This round focused on system design and quantitative problems.
Quantitative Questions:
1. A time and work-related problem
2. A permutation and combination (PNC) problem

System Design (High-Level Desing)
I was asked to design an elevator system for a 10-floor building with four elevator cars.

Final Stages

Three days after the interviews, I received a call from a manager who conducted a deep-dive review of my CV. At the end of the call, the manager verbally confirmed the offer.

One week later, I received an email regarding the background verification process, and after approximately 2 months, I received the official offer letter.