Java Programming

Java Learning Plan ✅

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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.

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🏆 – Java Developer Stage 1 – Java Basics (Syntax, Data Types, Variables) Stage 2 – Object-Oriented Programming (OOP) Stage 3 – Exception Handling Stage 4 – Java Collections Framework Stage 5 – File I/O Stage 6 – Multithreading and Concurrency Stage 7 – Java Streams and Lambda Expressions Stage 8 – JDBC Stage 9 – Servlets and JSP Stage 10 – Spring Framework Basics Stage 11 – Spring Boot Stage 12 – RESTful APIs with Spring Stage 13 – Testing Stage 14 – Deployment Stage 15 – Build projects

List of topics you need to cover if you're preparing for Java Interviews based on current Job market: 1. Core Java Fundamentals (Refer to already posted topics) 2. Advanced Java - Design Patterns - Multithreading - Java Memory Model - Performance Optimization - Reflection & Dynamic Proxies 3. Spring Framework - Spring core concepts - Spring boot - Spring Data JPA - Spring Security - Spring cloud - Spring webflux 4. Hibernate 5. Testing (JUnit, Mockito, Integration, Functional, Performance Testing) 6. Build Tools (Maven / Gradle) 7. Logging 8. RDBMS, NoSQL DBs 9. WebSecurity Concepts 10. REST API concepts 11. CI/CD (Jenkins, GitHub Actions) 12. Containerization (Docker, Kubernetes) 13. Version Control (GitHub) 14. Monitoring (Grafana, ELK Stack etc) 15. Cloud (AWS, Azure, GCP (Very rare) ) 16. Spring boot microservices 16. Messaging systems 17. Caching Strategies 18. System Design 19. Data Structures 20. Algorithms 21. Agile Methodologies 22. Behavioral questions

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Python Data Types 👆

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Essential Tools, Frameworks, & Concepts in Java Programming 1. Core Java Concepts: Object-Oriented Programming (OOP) Exception Handling Multithreading Collections Framework Generics Java I/O (Input/Output) Lambda Expressions and Streams (Java 8 and beyond) 2. Java Frameworks: Spring Framework: Comprehensive framework for enterprise applications. Hibernate: ORM (Object Relational Mapping) framework. Apache Struts: For building web applications. Play Framework: Lightweight and reactive web application framework. 3. Build Tools: Maven Gradle 4. Java Testing Frameworks: JUnit TestNG 5. Web Development with Java: Servlets and JSP (Java Server Pages) Spring MVC Thymeleaf 6. Java for Microservices: Spring Boot Spring Cloud Quarkus 7. Database Integration: JDBC (Java Database Connectivity) JPA (Java Persistence API) 8. IDEs for Java Development: IntelliJ IDEA Eclipse NetBeans 9. Advanced Concepts: JVM (Java Virtual Machine) Internals Garbage Collection Memory Management Reflection API 10. Java for Cloud and Distributed Systems: Apache Kafka Apache Hadoop Kubernetes (with Java apps) 11. Networking in Java: Sockets and ServerSockets RMI (Remote Method Invocation) 12. Popular Java Libraries: Apache Commons Google Guava Jackson (for JSON parsing) 13. Java for Android Development: Android Studio Java SDK Free books and courses to learn Java👇👇 https://imp.i115008.net/QOz50M https://bit.ly/3hbu3Dg https://imp.i115008.net/Jrjo1R https://bit.ly/3BSHP5S https://t.me/Java_Programming_Notes https://introcs.cs.princeton.edu/java/11cheatsheet/ Join @free4unow_backup for more free courses ENJOY LEARNING👍👍

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