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Data structures are ways of organizing and storing data in a computer so that it can be accessed and used efficiently.
Data structures can be linear or non-linear
Examples of linear data structures include arrays, linked lists, and stacks
Examples of non-linear data structures include trees and graphs
Choosing the right data structure is important for optimizing performance and memory usage
A linked list is a linear data structure where each element is a separate object linked together by pointers.
Linked list is used to implement stacks, queues, and hash tables.
It is used in computer memory allocation.
It is used in image processing to represent pixels.
It is used in music player to create a playlist.
It is used in web browsers to store the history of visited web pages.
Microcontroller is a self-contained system with memory, peripherals and processor, while microprocessor only has a processor.
Microcontroller has on-chip memory and peripherals, while microprocessor requires external memory and peripherals.
Microcontroller is used in embedded systems, while microprocessor is used in general-purpose computing.
Examples of microcontrollers include Arduino, PIC, and AVR, while examples of mi...
Yes, an array can have elements of different data types.
An array can have elements of different data types, but it's not recommended.
It can make the code harder to read and maintain.
For example, an array can have both strings and numbers: ['apple', 5, 'banana']
Transactions in a bank involve the movement of funds between accounts or the exchange of currency.
Transactions can be initiated by customers or by the bank itself
Common types of transactions include deposits, withdrawals, transfers, and loans
Transactions are recorded in the bank's ledger and may be subject to fees or interest
Electronic transactions have become increasingly popular, such as online banking and mobile pay
I have worked on various projects related to software development and data analysis.
Developed a web application for a client using React and Node.js
Analyzed customer data to identify trends and improve marketing strategies
Created a machine learning model to predict customer churn for a telecom company
Implemented a data pipeline using Apache Spark for processing large datasets
Collaborated with a team to develop a mobile
I will receive the student with an open mind and evaluate their skills and potential.
I will not judge the student based on their college reputation
I will assess their skills, knowledge, and potential through interviews and assessments
I will consider their extracurricular activities, internships, and projects
I will provide equal opportunities to all candidates regardless of their college
Example: I have previously hired ...
I am a highly motivated individual with a passion for problem-solving and a strong work ethic.
I have a degree in computer science and have completed several internships in the tech industry.
I am proficient in programming languages such as Java, Python, and C++.
I have experience working in both team and individual settings, and am comfortable with both.
I am always looking for ways to improve my skills and knowledge, and...
Oracle is a leading technology company providing innovative solutions to businesses worldwide.
Oracle is known for its database management systems
It offers cloud services, enterprise software, and hardware products
Oracle has a strong presence in the financial services industry
It has acquired several companies including Sun Microsystems and NetSuite
I would be thrilled to accept the offer and would work hard to excel in the consulting role.
Express gratitude and excitement for the opportunity
Assure the interviewer that you are eager to take on the role
Emphasize your commitment to working hard and excelling in the position
Thank the interviewer for considering you for the role
I enjoy reading, hiking, and playing board games.
Reading: I love getting lost in a good book, especially science fiction and fantasy.
Hiking: I enjoy exploring new trails and challenging myself physically.
Board games: I like playing strategy games with friends and family, such as Settlers of Catan and Ticket to Ride.
I applied via Campus Placement
DSA and Aptitude MCQs
I applied via campus placement at Dehradun Institute of Technology, Dehradun and was interviewed in Nov 2023. There were 2 interview rounds.
Only 2 are there in coding question
What people are saying about Oracle
Oracle interview questions for designations
I applied via Campus Placement and was interviewed in Apr 2024. There were 2 interview rounds.
Very basic programming
Very easy and basic maths, reasoning questions
Get interview-ready with Top Oracle Interview Questions
I applied via Campus Placement and was interviewed in Sep 2023. There were 2 interview rounds.
The four pillars of OOPS are encapsulation, inheritance, polymorphism, and abstraction.
Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Using private variables and public methods in a class.
Inheritance: Allowing a new class to inherit properties and behavior from an existing class. Example: Creating a subclass that inherits from a superclass.
Polymorphism: The ability to pre...
4 levels. English comprehension, aptitude, psychometry and finance
Group of 6 in each GD
Case study solving and presentation
I applied via Approached by Company and was interviewed in Sep 2022. There were 4 interview rounds.
Program to remove duplicate elements from String and count their occurrences.
Create a HashSet to store unique characters from the String.
Iterate through the String and add each character to the HashSet.
While adding, check if the character already exists in the HashSet and increment its count.
Print the count of each character that has duplicates.
Return the modified String with duplicates removed.
A program to capitalize the first letter of each word in a sentence.
Split the sentence into words
Loop through each word and capitalize the first letter
Join the words back into a sentence
Java Map is an interface that maps unique keys to values. It works internally using hash table data structure.
Map interface is implemented by HashMap, TreeMap, LinkedHashMap, etc.
Keys in a map must be unique and values can be duplicated.
Hash table data structure is used to store key-value pairs internally.
Hashing is used to convert keys into indices of an array where values are stored.
Collision resolution techniques li...
Lists are used for small collections, linked lists for large or frequently modified collections.
Use lists for small collections that don't require frequent modifications.
Use linked lists for large collections or collections that require frequent modifications.
Linked lists are better for inserting or deleting elements in the middle of the collection.
Lists are better for accessing elements by index.
Example: Use a list to...
Primitives are basic data types in Java while wrapper classes are objects that wrap around primitives.
Primitives are faster and take less memory than wrapper classes.
Wrapper classes provide additional functionality like conversion to and from strings.
Primitives are passed by value while wrapper classes are passed by reference.
Examples of primitives include int, boolean, and double while examples of wrapper classes incl
JVM is an abstract machine that executes Java bytecode. It consists of class loader, runtime data area, and execution engine.
JVM stands for Java Virtual Machine.
It is responsible for executing Java bytecode.
JVM architecture consists of class loader, runtime data area, and execution engine.
Class loader loads the class files into the memory.
Runtime data area is divided into method area, heap, and stack.
Execution engine e...
String is immutable because it cannot be changed once created.
Immutable objects are safer to use in multi-threaded environments.
String pool in Java is possible because of immutability.
StringBuffer and StringBuilder are mutable alternatives to String.
Java 8 introduced several new features including lambda expressions, streams, and default methods.
Lambda expressions allow for functional programming and simplify code.
Streams provide a way to process collections of data in a functional way.
Default methods allow for adding new methods to interfaces without breaking existing implementations.
Other features include the Optional class, Date and Time API, and Nashorn JavaSc...
Functional interfaces are interfaces with only one abstract method. There are four types of functional interfaces.
Consumer: accepts a single argument and returns no result. Example: Consumer
Supplier: takes no argument and returns a result. Example: Supplier
Predicate: takes a single argument and returns a boolean. Example: Predicate
Function: takes a single argument and returns a result. Example: Function
Program to separate even and odd numbers using Java 8.
Use Java 8 Stream API to filter even and odd numbers
Create two separate lists for even and odd numbers
Use lambda expressions to filter the numbers
Example: List
Example: List
Spring Boot annotations are used to simplify the development process. Some common annotations are @SpringBootApplication, @RestController, @Autowired, @GetMapping, @PostMapping, @Service, @Repository, @Component, etc.
The @SpringBootApplication annotation is used to mark the main class of the application.
The @RestController annotation is used to mark a class as a RESTful controller.
The @Autowired annotation is used to i...
String is immutable while StringBuffer is mutable.
String objects are constant and cannot be changed once created.
StringBuffer objects are mutable and can be modified.
StringBuffer is thread-safe while String is not.
StringBuffer has methods to append, insert, and delete while String does not.
Example: String str = "hello"; StringBuffer sb = new StringBuffer("world");
str.concat("world"); // returns a new string "helloworld...
String Buffer and String Builder are both used to manipulate strings, but the former is synchronized while the latter is not.
String Buffer is thread-safe while String Builder is not
String Builder is faster than String Buffer
String Builder is preferred when thread safety is not a concern
String Buffer is used when multiple threads are involved in manipulating the same string
Both classes have similar methods for appending
Sensitive information can be removed from serializable interface by implementing custom serialization.
Create a custom serialization method that excludes sensitive information.
Use the transient keyword to mark sensitive fields as non-serializable.
Consider using encryption or hashing to protect sensitive data.
Test serialization and deserialization to ensure sensitive information is not included.
Examples: exclude password...
Marker interface is an interface with no methods. It is used to mark a class for special treatment.
Marker interface is used to provide metadata to the JVM.
It is used to indicate that a class has some special behavior or characteristics.
Example: Serializable interface in Java.
Marker interfaces are used for reflection and serialization.
They are also used in frameworks like Spring and Hibernate.
Marker interfaces are also ...
There are four types of HTTP requests in Spring Boot: GET, POST, PUT, and DELETE.
GET: used to retrieve data from a server
POST: used to submit data to a server
PUT: used to update existing data on a server
DELETE: used to delete data from a server
These requests are handled by the @RequestMapping annotation in Spring Boot
Factory Design Pattern is used to create objects without exposing the creation logic to the client.
It provides a way to delegate the object creation to a factory class.
It helps in achieving loose coupling between classes.
It is useful when we have a super class with multiple sub-classes and based on input, we need to return one of the sub-class.
Examples include: java.util.Calendar, java.text.NumberFormat, java.nio.chars
HTTP response codes indicate the status of a web request. There are 5 categories of codes.
1xx - Informational
2xx - Success
3xx - Redirection
4xx - Client Error
5xx - Server Error
Difference between @Service and @Component
Both are used for component scanning in Spring
@Service is used for service layer classes
@Component is used for general purpose beans
Service layer classes contain business logic
Examples of @Service: UserService, ProductService
Examples of @Component: DAO, Utility classes
Remove duplicate elements in an array.
Create a new empty array.
Loop through the original array and check if the element already exists in the new array.
If it doesn't exist, add it to the new array.
Return the new array without duplicates.
The OSI model has 7 layers that define how data is transmitted over a network.
Layer 1: Physical layer - deals with the physical aspects of transmitting data
Layer 2: Data link layer - responsible for error-free transfer of data between nodes
Layer 3: Network layer - handles routing of data between different networks
Layer 4: Transport layer - ensures reliable delivery of data between applications
Layer 5: Session layer - e...
TCP/IP model has four layers: Application, Transport, Internet, and Network Access.
Application layer handles high-level protocols like HTTP, FTP, SMTP, etc.
Transport layer provides end-to-end communication between hosts using TCP or UDP protocols.
Internet layer handles the routing of data packets between networks using IP protocol.
Network Access layer deals with the physical transmission of data over the network.
Exampl...
TCP is a reliable, connection-oriented protocol. UDP is a connectionless protocol. TLS is a secure protocol for data encryption.
TCP ensures reliable data transmission by establishing a connection between sender and receiver.
UDP is faster but less reliable as it does not establish a connection before sending data.
TLS provides secure communication by encrypting data and verifying the identity of the communicating parties...
SIP signalling is a protocol used for initiating, modifying, and terminating real-time sessions that involve video, voice, messaging, and other communications applications.
SIP stands for Session Initiation Protocol.
It is used to establish, modify, and terminate multimedia sessions.
SIP signalling is used in VoIP (Voice over Internet Protocol) and other real-time communication applications.
It uses a request-response mode...
TCP/IP model is a protocol used for data communication. It consists of four layers: application, transport, internet, and network access.
Data is sent from the application layer to the transport layer where it is divided into segments.
The internet layer adds IP addresses to the segments and sends them to the network access layer.
The network access layer adds physical addresses and sends the data over the network.
The pro...
Remove strings from an array whose length is less than 3.
Loop through the array and check the length of each string.
If the length is less than 3, remove that string from the array.
Use a for loop or filter method to remove the strings.
Example: ['cat', 'dog', 'bird', 'elephant'] -> ['cat', 'dog', 'bird', 'elephant']
Example: ['a', 'to', 'the', 'in'] -> ['the', 'in']
I applied via Campus Placement and was interviewed before May 2023. There were 2 interview rounds.
2 QUESTIONS, 1 OF API
I applied via campus placement at Fr Conceicao Rodrigues College of Engineering, Mumbai and was interviewed before Jun 2023. There were 2 interview rounds.
2 DSA Question, 1- SQL Question
Some of the top questions asked at the Oracle Associate Consultant interview -
The duration of Oracle Associate Consultant interview process can vary, but typically it takes about less than 2 weeks to complete.
2 Interview rounds
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