Preparing for a Java Interview?
Here are some essential Java questions to help you review important concepts:
Core Java Concepts:
1. What is the difference between JDK and JRE?
2. Why is Java platform-independent?
3. What is the difference between an abstract class and an interface?
4. What is the difference between final, finally, and finalize?
5. What is the difference between stack and heap memory?
6. What is method overloading vs. method overriding?
7. What’s the difference between a private and protected modifier?
8. What is constructor overloading in Java?
9. How is the super keyword used in Java?
10. What is the difference between static methods, variables, and classes?
11. What is System.out.println in Java?
12. What part of memory (Stack or Heap) is cleaned during garbage collection?
Object-Oriented Programming:
1. What Object-Oriented features are supported by Java?
2. What are the different access specifiers in Java?
3. What’s the difference between composition and inheritance?
4. What is the purpose of an abstract class?
5. What’s the difference between a constructor and a method?
6. What is the diamond problem in Java, and how is it resolved?
7. How do local and instance variables differ?
8. What is a Marker interface in Java?
Data Structures and Algorithms:
1. Why are strings immutable in Java?
2. What’s the difference between creating a String using new() and as a literal?
3. What is the Collections framework?
4. How do ArrayList and LinkedList differ?
5. What is the difference between a HashMap and a TreeMap?
6. How do HashSet and TreeSet differ?
7. What’s the difference between an Iterator and a ListIterator?
8. What is the purpose of the Comparable interface?
9. What is the java.util.concurrent package for?
Exception Handling:
1. What is an exception in Java?
2. How does exception propagation work?
3. What’s the difference between checked and unchecked exceptions?
4. What is the use of the try-catch block in Java?
5. How do throw and throws differ?
6. What is the use of the finally block?
7. What’s the base class of all exception classes?
Multithreading:
1. What is a thread, and what are its stages in Java?
2. How do threads differ from processes?
3. What are the different types of thread priorities in Java?
4. What is context switching in Java?
5. What’s the difference between user threads and Daemon threads?
6. What is synchronization in Java?
7. What is a deadlock in Java?
8. How are the wait() and notify() methods used?
9. What’s the difference between synchronized and volatile in Java?
10. What’s the purpose of the sleep() method?
11. How do wait() and sleep() differ?
12. What’s the difference between notify() and notifyAll()?
Java Enterprise Edition (Java EE):
1. What is Java EE?
2. How do Servlets and JSP differ?
3. What is the purpose of the Java Persistence API (JPA)?
4. What’s the difference between stateful and stateless session beans?
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Here are some essential Java questions to help you review important concepts:
Core Java Concepts:
1. What is the difference between JDK and JRE?
2. Why is Java platform-independent?
3. What is the difference between an abstract class and an interface?
4. What is the difference between final, finally, and finalize?
5. What is the difference between stack and heap memory?
6. What is method overloading vs. method overriding?
7. What’s the difference between a private and protected modifier?
8. What is constructor overloading in Java?
9. How is the super keyword used in Java?
10. What is the difference between static methods, variables, and classes?
11. What is System.out.println in Java?
12. What part of memory (Stack or Heap) is cleaned during garbage collection?
Object-Oriented Programming:
1. What Object-Oriented features are supported by Java?
2. What are the different access specifiers in Java?
3. What’s the difference between composition and inheritance?
4. What is the purpose of an abstract class?
5. What’s the difference between a constructor and a method?
6. What is the diamond problem in Java, and how is it resolved?
7. How do local and instance variables differ?
8. What is a Marker interface in Java?
Data Structures and Algorithms:
1. Why are strings immutable in Java?
2. What’s the difference between creating a String using new() and as a literal?
3. What is the Collections framework?
4. How do ArrayList and LinkedList differ?
5. What is the difference between a HashMap and a TreeMap?
6. How do HashSet and TreeSet differ?
7. What’s the difference between an Iterator and a ListIterator?
8. What is the purpose of the Comparable interface?
9. What is the java.util.concurrent package for?
Exception Handling:
1. What is an exception in Java?
2. How does exception propagation work?
3. What’s the difference between checked and unchecked exceptions?
4. What is the use of the try-catch block in Java?
5. How do throw and throws differ?
6. What is the use of the finally block?
7. What’s the base class of all exception classes?
Multithreading:
1. What is a thread, and what are its stages in Java?
2. How do threads differ from processes?
3. What are the different types of thread priorities in Java?
4. What is context switching in Java?
5. What’s the difference between user threads and Daemon threads?
6. What is synchronization in Java?
7. What is a deadlock in Java?
8. How are the wait() and notify() methods used?
9. What’s the difference between synchronized and volatile in Java?
10. What’s the purpose of the sleep() method?
11. How do wait() and sleep() differ?
12. What’s the difference between notify() and notifyAll()?
Java Enterprise Edition (Java EE):
1. What is Java EE?
2. How do Servlets and JSP differ?
3. What is the purpose of the Java Persistence API (JPA)?
4. What’s the difference between stateful and stateless session beans?
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https://news.1rj.ru/str/open_source7
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Java interview questions along with brief answers
1. What is the difference between
-
2. Explain the difference between
-
3. What is the significance of the
- The
4. What is the difference between an abstract class and an interface?
- An abstract class can have both abstract (unimplemented) and concrete (implemented) methods, while an interface can only have abstract methods. A class can implement multiple interfaces, but it can extend only one abstract class.
5. What is the purpose of the
- The
6. Explain the concept of multithreading in Java.
- Multithreading is the concurrent execution of two or more threads. Threads allow programs to run tasks in parallel, improving performance. In Java, you can create threads by extending the
7. What is the
-
8. How does garbage collection work in Java?
- Garbage collection is the process of automatically reclaiming memory occupied by unreferenced objects. Java uses a garbage collector to identify and delete objects that are no longer reachable.
9. Explain the
- The
10. What is the Java Virtual Machine (JVM)?
- JVM is a virtual machine that executes Java bytecode. It abstracts the hardware and operating system details, allowing Java programs to run on any device with a compatible JVM.
These questions cover a range of Java concepts commonly discussed in interviews. Be prepared to elaborate on your answers and provide examples if requested during an interview.
1. What is the difference between
== and .equals() in Java?-
== compares object references, while .equals() compares the content of objects.2. Explain the difference between
ArrayList and LinkedList.-
ArrayList uses a dynamic array to store elements, providing fast random access. LinkedList uses a doubly-linked list, offering efficient insertion and deletion.3. What is the significance of the
static keyword in Java?- The
static keyword is used to create variables and methods that belong to the class rather than instances of the class. These can be accessed without creating an object.4. What is the difference between an abstract class and an interface?
- An abstract class can have both abstract (unimplemented) and concrete (implemented) methods, while an interface can only have abstract methods. A class can implement multiple interfaces, but it can extend only one abstract class.
5. What is the purpose of the
finally block in exception handling?- The
finally block is used to ensure that a specific block of code is always executed, regardless of whether an exception is thrown or not.6. Explain the concept of multithreading in Java.
- Multithreading is the concurrent execution of two or more threads. Threads allow programs to run tasks in parallel, improving performance. In Java, you can create threads by extending the
Thread class or implementing the Runnable interface.7. What is the
NullPointerException and how can it be avoided?-
NullPointerException occurs when you try to access a method or field of an object that is null. To avoid it, ensure that objects are properly initialized before accessing their members.8. How does garbage collection work in Java?
- Garbage collection is the process of automatically reclaiming memory occupied by unreferenced objects. Java uses a garbage collector to identify and delete objects that are no longer reachable.
9. Explain the
final keyword in Java.- The
final keyword can be applied to variables, methods, and classes. When applied to a variable, it means the variable's value cannot be changed. When applied to a method, it prevents method overriding. When applied to a class, it prevents the class from being subclassed.10. What is the Java Virtual Machine (JVM)?
- JVM is a virtual machine that executes Java bytecode. It abstracts the hardware and operating system details, allowing Java programs to run on any device with a compatible JVM.
These questions cover a range of Java concepts commonly discussed in interviews. Be prepared to elaborate on your answers and provide examples if requested during an interview.
Typical java interview questions sorted by experience
Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* What’s the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* What’s the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* What’s the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several “simple” threads?
* What the difference between local, instance and class variables?
Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have “memory leaks” on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?
Senior
* How does Integer.parseInt() works?
* Do you know what is the “double check locking” problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* What’s the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?
Source: medium.
https://news.1rj.ru/str/open_source7
Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* What’s the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* What’s the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* What’s the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several “simple” threads?
* What the difference between local, instance and class variables?
Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have “memory leaks” on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?
Senior
* How does Integer.parseInt() works?
* Do you know what is the “double check locking” problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* What’s the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?
Source: medium.
https://news.1rj.ru/str/open_source7
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lafore-robert-data-structures-and-algorithms-in-java.pdf
4.1 MB
Data Structures and Algorithms in Java
Robert Lafore, 2002
Robert Lafore, 2002
Java Backend Development is a highly in-demand and well-paying job in the tech industry.
If you're looking to become an excellent Java Developer, here's a roadmap that includes various online resources:
1. Core Java
First comes the fundamentals of Java Programming, here you will understand OOP concepts, conditional statements, collection frameworks,and many more.
https://youtube.com/playlist?list=PLd3UqWTnYXOnjGmyjD3zbIkyLXP15-6w0&si=UYvQhVNlZQYCH1Il
2. JDBC
A Java API that allows you to access tabular data, especially data stored in a relational database.
https://youtube.com/playlist?list=PLsyeobzWxl7rU7Jz3zDRpqB-EODzBbHOI&si=Cc45vpeRXGIUKbfn
3. SQL
Get a good understanding of SQL, which is necessary to work with JDBC to write queries.
https://youtu.be/7S_tz1z_5bA
4. JSP + Servlet
Learn JSP and Servlet, which are used for writing web pages for web applications and handling client requests on the server-side.
https://youtube.com/playlist?list=PLE0F6C1917A427E96&si=TQeOIgluG3R29622
5. Spring Framework
5.1. Core Spring Framework
https://youtu.be/GB8k2-Egfv0?si=dHYp6rFkGVl9RMt8
5.2. Spring REST & Spring DATA
https://youtu.be/GwYUjzPrQTM?si=hJfmpukii2WnofxQ
5.3. Spring Security
Spring Security is the primary choice for implementing application-level security
https://youtu.be/sm-8qfMWEV8?si=uMkpBxOUXIptZif9
6. Hibernate Framework
Hibernate is a Java framework that simplifies the development of Java application to interact with the database. It is an open source, lightweight, ORM (Object Relational Mapping) tool.
https://youtu.be/Yv2xctJxE-w?si=q4FIOBxxX-Y0Qj5q
7. Spring Boot
Spring Boot is the ultimate framework and Makes Java Web Development less boilerplate, it can help you make production-ready applications in no time.
https://youtu.be/msXL2oDexqw?si=XB19MCCECAggcB18
8. Basic DevOps
8.1. Learn to Use AWS & Deploy Java Apps
https://youtube.com/playlist?list=PLVz2XdJiJQxxurKT1Dqz6rmiMuZNdClqv&si=bJyg0Np11PkGDIKO
8.2. Learn Basic Docker:
https://youtu.be/p28piYY_wv8?si=Xoqje7MJad1NeE9g
8.3. Learn Basic Kubernetes:
https://youtu.be/rTNR7vDQDD8?si=dgzwxQof7yGHUP4n
8.4. Deploy Spring Boot App on Kubernetes:
https://youtu.be/EZolJ4lNiYc?si=Kw09qKwMp_LxHTvw
9. Basic of git and GitHub
https://youtu.be/apGV9Kg7ics?si=MHtCgD8o7XqpU4W3
10. Java Microservices
https://youtu.be/tuJqH3AV0e8?si=1jjrWl4l4uYGrE5i
14. Java Quick revision for Interviews
https://youtu.be/oYXivKMSEqM?si=tngbZrvgbAwsShEb
15. Spring JMS(java messaging services)
JMS is a standard Java API that allows a Java application to send messages to another application.
https://youtube.com/playlist?list=PLmCsXDGbJHdibOx6axScPiuHA8ftsrmut&si=J0qjBSbB4GDCeTOv
If you're looking to become an excellent Java Developer, here's a roadmap that includes various online resources:
1. Core Java
First comes the fundamentals of Java Programming, here you will understand OOP concepts, conditional statements, collection frameworks,and many more.
https://youtube.com/playlist?list=PLd3UqWTnYXOnjGmyjD3zbIkyLXP15-6w0&si=UYvQhVNlZQYCH1Il
2. JDBC
A Java API that allows you to access tabular data, especially data stored in a relational database.
https://youtube.com/playlist?list=PLsyeobzWxl7rU7Jz3zDRpqB-EODzBbHOI&si=Cc45vpeRXGIUKbfn
3. SQL
Get a good understanding of SQL, which is necessary to work with JDBC to write queries.
https://youtu.be/7S_tz1z_5bA
4. JSP + Servlet
Learn JSP and Servlet, which are used for writing web pages for web applications and handling client requests on the server-side.
https://youtube.com/playlist?list=PLE0F6C1917A427E96&si=TQeOIgluG3R29622
5. Spring Framework
5.1. Core Spring Framework
https://youtu.be/GB8k2-Egfv0?si=dHYp6rFkGVl9RMt8
5.2. Spring REST & Spring DATA
https://youtu.be/GwYUjzPrQTM?si=hJfmpukii2WnofxQ
5.3. Spring Security
Spring Security is the primary choice for implementing application-level security
https://youtu.be/sm-8qfMWEV8?si=uMkpBxOUXIptZif9
6. Hibernate Framework
Hibernate is a Java framework that simplifies the development of Java application to interact with the database. It is an open source, lightweight, ORM (Object Relational Mapping) tool.
https://youtu.be/Yv2xctJxE-w?si=q4FIOBxxX-Y0Qj5q
7. Spring Boot
Spring Boot is the ultimate framework and Makes Java Web Development less boilerplate, it can help you make production-ready applications in no time.
https://youtu.be/msXL2oDexqw?si=XB19MCCECAggcB18
8. Basic DevOps
8.1. Learn to Use AWS & Deploy Java Apps
https://youtube.com/playlist?list=PLVz2XdJiJQxxurKT1Dqz6rmiMuZNdClqv&si=bJyg0Np11PkGDIKO
8.2. Learn Basic Docker:
https://youtu.be/p28piYY_wv8?si=Xoqje7MJad1NeE9g
8.3. Learn Basic Kubernetes:
https://youtu.be/rTNR7vDQDD8?si=dgzwxQof7yGHUP4n
8.4. Deploy Spring Boot App on Kubernetes:
https://youtu.be/EZolJ4lNiYc?si=Kw09qKwMp_LxHTvw
9. Basic of git and GitHub
https://youtu.be/apGV9Kg7ics?si=MHtCgD8o7XqpU4W3
10. Java Microservices
https://youtu.be/tuJqH3AV0e8?si=1jjrWl4l4uYGrE5i
14. Java Quick revision for Interviews
https://youtu.be/oYXivKMSEqM?si=tngbZrvgbAwsShEb
15. Spring JMS(java messaging services)
JMS is a standard Java API that allows a Java application to send messages to another application.
https://youtube.com/playlist?list=PLmCsXDGbJHdibOx6axScPiuHA8ftsrmut&si=J0qjBSbB4GDCeTOv
Confused about which field to dive into—Front-End Development (FE), Back-End Development (BE), Machine Learning (ML), or Blockchain?
Here's a concise breakdown of each, designed to clarify your options:
### Front-End Development (FE)
Key Skills:
- HTML/CSS: Fundamental for creating the structure and style of web pages.
- JavaScript: Essential for adding interactivity and functionality to websites.
- Frameworks/Libraries: React, Angular, or Vue.js for efficient and scalable front-end development.
- Responsive Design: Ensuring websites look good on all devices.
- Version Control: Git for managing code changes and collaboration.
Career Prospects:
- Web Developer
- UI/UX Designer
- Front-End Engineer
### Back-End Development (BE)
Key Skills:
- Programming Languages: Python, Java, Ruby, Node.js, or PHP for server-side logic.
- Databases: SQL (MySQL, PostgreSQL) and NoSQL (MongoDB) for data management.
- APIs: RESTful and GraphQL for communication between front-end and back-end.
- Server Management: Understanding of server, network, and hosting environments.
- Security: Knowledge of authentication, authorization, and data protection.
Career Prospects:
- Back-End Developer
- Full-Stack Developer
- Database Administrator
### Machine Learning (ML)
Key Skills:
- Programming Languages: Python and R are widely used in ML.
- Mathematics: Statistics, linear algebra, and calculus for understanding ML algorithms.
- Libraries/Frameworks: TensorFlow, PyTorch, Scikit-Learn for building ML models.
- Data Handling: Pandas, NumPy for data manipulation and preprocessing.
- Model Evaluation: Techniques for assessing model performance.
Career Prospects:
- Data Scientist
- Machine Learning Engineer
- AI Researcher
### Blockchain
Key Skills:
- Cryptography: Understanding of encryption and security principles.
- Blockchain Platforms: Ethereum, Hyperledger, Binance Smart Chain for building decentralized applications.
- Smart Contracts: Solidity for developing smart contracts.
- Distributed Systems: Knowledge of peer-to-peer networks and consensus algorithms.
- Blockchain Tools: Truffle, Ganache, Metamask for development and testing.
Career Prospects:
- Blockchain Developer
- Smart Contract Developer
- Crypto Analyst
### Decision Criteria
1. Interest: Choose an area you are genuinely interested in.
2. Market Demand: Research the current job market to see which skills are in demand.
3. Career Goals: Consider your long-term career aspirations.
4. Learning Curve: Assess how much time and effort you can dedicate to learning new skills.
Each field offers unique opportunities and challenges, so weigh your options carefully based on your personal preferences and career objectives.
Here are some telegram channels to help you build your career 👇
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Here's a concise breakdown of each, designed to clarify your options:
### Front-End Development (FE)
Key Skills:
- HTML/CSS: Fundamental for creating the structure and style of web pages.
- JavaScript: Essential for adding interactivity and functionality to websites.
- Frameworks/Libraries: React, Angular, or Vue.js for efficient and scalable front-end development.
- Responsive Design: Ensuring websites look good on all devices.
- Version Control: Git for managing code changes and collaboration.
Career Prospects:
- Web Developer
- UI/UX Designer
- Front-End Engineer
### Back-End Development (BE)
Key Skills:
- Programming Languages: Python, Java, Ruby, Node.js, or PHP for server-side logic.
- Databases: SQL (MySQL, PostgreSQL) and NoSQL (MongoDB) for data management.
- APIs: RESTful and GraphQL for communication between front-end and back-end.
- Server Management: Understanding of server, network, and hosting environments.
- Security: Knowledge of authentication, authorization, and data protection.
Career Prospects:
- Back-End Developer
- Full-Stack Developer
- Database Administrator
### Machine Learning (ML)
Key Skills:
- Programming Languages: Python and R are widely used in ML.
- Mathematics: Statistics, linear algebra, and calculus for understanding ML algorithms.
- Libraries/Frameworks: TensorFlow, PyTorch, Scikit-Learn for building ML models.
- Data Handling: Pandas, NumPy for data manipulation and preprocessing.
- Model Evaluation: Techniques for assessing model performance.
Career Prospects:
- Data Scientist
- Machine Learning Engineer
- AI Researcher
### Blockchain
Key Skills:
- Cryptography: Understanding of encryption and security principles.
- Blockchain Platforms: Ethereum, Hyperledger, Binance Smart Chain for building decentralized applications.
- Smart Contracts: Solidity for developing smart contracts.
- Distributed Systems: Knowledge of peer-to-peer networks and consensus algorithms.
- Blockchain Tools: Truffle, Ganache, Metamask for development and testing.
Career Prospects:
- Blockchain Developer
- Smart Contract Developer
- Crypto Analyst
### Decision Criteria
1. Interest: Choose an area you are genuinely interested in.
2. Market Demand: Research the current job market to see which skills are in demand.
3. Career Goals: Consider your long-term career aspirations.
4. Learning Curve: Assess how much time and effort you can dedicate to learning new skills.
Each field offers unique opportunities and challenges, so weigh your options carefully based on your personal preferences and career objectives.
Here are some telegram channels to help you build your career 👇
Join @ for more free resources.
ENJOY LEARNING 👍👍
AI Tools to Finish Hours of Work in Minutes:
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• Claude AI
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#ai
1. 𝐈𝐝𝐞𝐚𝐬
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• Better research
2. 𝐈𝐦𝐚𝐠𝐞𝐬
• Midjourney
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• Leap AI
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• Stable Diffusion
3. 𝐍𝐨𝐭𝐞𝐬
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#ai
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