Java 17 vs Java 21: Highways vs Hyperloops for Java Developers

Java 25 — Robust, Efficient, and Modern by Design Java 25 continues to prove why the platform remains one of the strongest pillars of enterprise software. This release focuses on performance, concurrency, and developer productivity, refining the language for today’s large-scale, cloud-native systems. Key Technical Highlights 🧩 Value Objects (Project Valhalla) A leap toward performance-oriented immutability. Value classes remove object overhead while keeping strong type safety. value class Point { int x, y; } This brings near-primitive performance, reduced garbage collection, and improved cache locality — ideal for computation-heavy scenarios like finance, analytics, or AI. ⚙️ Virtual Threads (Project Loom) Concurrency made simple and scalable. With virtual threads, Java can now handle thousands of concurrent tasks with minimal overhead: try (var executor = Executors.newVirtualThreadPerTaskExecutor()) { IntStream.range(0, 10000).forEach(i -> executor.submit(() -> process(i)) ); } It’s a game-changer for I/O-bound systems — replacing reactive complexity with clear, imperative logic. 🎯 Pattern Matching & Switch Expressions Cleaner and safer branching: switch (obj) { case String s -> System.out.println("Length: " + s.length()); case Integer i -> System.out.println("Value: " + i); default -> System.out.println("Unknown type"); } 📚 Sequenced Collections & API Improvements Collections now ensure predictable iteration order and improved stream consistency — simplifying complex data transformations. ⚠️ Points to Watch Compatibility: Frameworks like Spring and Hibernate are catching up with virtual threads and value classes. Performance Tuning: Gains depend on GC settings, memory layout, and workload profile. Migration Strategy: Incremental adoption is recommended — especially for teams moving from Java 8 or 11. 💭 Discussion Starters Have you experimented with virtual threads in production yet? What’s your experience with value classes and real-world performance? How are teams preparing their stacks to embrace Java 25’s concurrency model? 🧠 Closing Thought Java 25 is not about reinvention — it’s about refinement. It bridges decades of stability with the performance and scalability modern software demands. #Java25 #SoftwareEngineering #SpringBoot #Performance #Concurrency #JavaDeveloper #Programming #Innovation #ProjectLoom #ProjectValhalla

Top 10 Java Internals Every Developer must Know --> 𝟭. 𝗝𝗩𝗠 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 The brain of Java. Handles class loading, memory management, and execution via the ClassLoader, Memory Areas (Heap, Stack, Metaspace), and Execution Engine (JIT + Interpreter). 𝟮. 𝗖𝗹𝗮𝘀𝘀 𝗟𝗼𝗮𝗱𝗶𝗻𝗴 & 𝗕𝘆𝘁𝗲𝗰𝗼𝗱𝗲 Turning source code into bytecode magic. Dynamic loading via a delegation model ensures security and modularity. Each class lives in one ClassLoader universe. 𝟯. 𝗚𝗮𝗿𝗯𝗮𝗴𝗲 𝗖𝗼𝗹𝗹𝗲𝗰𝘁𝗶𝗼𝗻 (𝗚𝗖) Memory cleanup with attitude. G1, ZGC, and Shenandoah manage heap generations, compacting memory with minimal pause times — so your app doesn’t stutter mid-run. 𝟰. 𝗝𝘂𝘀𝘁-𝗜𝗻-𝗧𝗶𝗺𝗲 (𝗝𝗜𝗧) 𝗖𝗼𝗺𝗽𝗶𝗹𝗮𝘁𝗶𝗼𝗻 When your code gets smarter at runtime. Hot methods are compiled into native code. JIT performs inlining, escape analysis, and optimization based on profiling data. 𝟱. 𝗝𝗮𝘃𝗮 𝗠𝗲𝗺𝗼𝗿𝘆 𝗠𝗼𝗱𝗲𝗹 (𝗝𝗠𝗠) Defines how threads actually see memory. Guarantees “happens-before” rules. Understands visibility, ordering, and atomicity — essential for writing safe concurrent code. 𝟲. 𝗦𝘆𝗻𝗰𝗵𝗿𝗼𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻 & 𝗟𝗼𝗰𝗸𝘀 Inside the synchronized keyword. JVM uses biased, lightweight, and heavyweight locks. Too much contention? JVM dynamically escalates the lock strategy. 𝟳. 𝗖𝗹𝗮𝘀𝘀 𝗗𝗮𝘁𝗮 𝗦𝗵𝗮𝗿𝗶𝗻𝗴 (𝗖𝗗𝗦) & 𝗔𝗢𝗧 Faster startup, smaller footprint. CDS stores preloaded classes in a shared archive; AOT (Ahead-of-Time) compilation skips JIT for faster boot — perfect for microservices. 𝟴. 𝗡𝗮𝘁𝗶𝘃𝗲 𝗜𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 (𝗝𝗡𝗜 & 𝗣𝗮𝗻𝗮𝗺𝗮) When Java shakes hands with C/C++. Bridges Java and native code for performance-critical tasks, while Project Panama makes it safer and faster than legacy JNI. 𝟵. 𝗝𝗩𝗠 𝗧𝘂𝗻𝗶𝗻𝗴 & 𝗠𝗼𝗻𝗶𝘁𝗼𝗿𝗶𝗻𝗴 Keep your JVM happy and your prod stable. Tweak -Xmx, -XX:+UseG1GC, use JFR, JConsole, and VisualVM for insights. Heap dumps tell the story of your runtime. 𝟭𝟬. 𝗥𝗲𝗳𝗹𝗲𝗰𝘁𝗶𝗼𝗻 & 𝗠𝗲𝘁𝗮𝗱𝗮𝘁𝗮 Java looking at itself. Power behind frameworks like Spring and Hibernate. Uses class metadata and dynamic proxies to wire behavior at runtime. #java #javaDeepDive #coreJava #javaInternal #javaInterview #softwareEngineering #javaDeveloper #javaWins #modernJava #java25 #jdk #jre #jdkInternal #javaConcurrency #jvm

🚀 Java Spring boot questions 1. Explain the difference between Comparable and Comparator. Which one is more flexible in real projects? 2. How does Garbage Collector decide which objects to clean? What is the difference between Minor GC & Major GC? 3. Why String is immutable in Java? What benefits does it give in multi-threaded environments? 4. How does ClassLoader work in Java? Can we have multiple classloaders in one JVM? 5. Difference between StringBuffer, StringBuilder, and normal String. Which one to use where? 🔹 Collections & Performance 6. How does CopyOnWriteArrayList work internally? When would you prefer it? 7. What is the difference between fail-fast and fail-safe iterators? 8. If you have millions of records to process, would you use Stream API or traditional loops? Why? 9. How does TreeMap maintain ordering? Can we provide custom sorting logic? 10. How do you find duplicates in a list using Java 8 features? 🔹 Spring & Spring Boot 11. What is the difference between @Transactional at class level vs method level? 12. Can you explain how Spring Boot auto-configuration works internally? 13. How do you configure multiple datasources in Spring Boot? 14. What’s the difference between @RequestParam, @PathVariable, and @RequestBody? 15. How do you monitor and optimize Spring Boot applications in production? 🔹 Microservices & System Design 16. How do you implement distributed logging in microservices? 17. What’s the difference between synchronous vs asynchronous communication in microservices? 18. How would you design a service to handle 1000+ requests per second? 19. How do you handle transactions that span across multiple microservices? 20. Can you explain the circuit breaker pattern? When have you used it? 🔹 Database & Real-time Scenarios 21. How do you implement pagination in SQL + Java? 22. If a query is taking 5 seconds, how would you debug & optimize it? 23. What’s the difference between optimistic and pessimistic locking? Which one is better in microservices? 24. How do you implement caching in Spring Boot + DB to reduce load? 25. Real-world scenario: If one service keeps failing in production, how will you identify whether it’s a code issue, infra issue, or DB issue? 👉 Over to you — If you recently gave an interview, which round felt most challenging for you? (Core Java / Spring Boot / Microservices / SQL)?

Understanding jlink — Build Your Own Custom Java Runtime Since Java 9, the JDK introduced a revolutionary tool called jlink, and yet many developers still don’t use it — even though it can drastically reduce runtime size and improve startup performance. So what does jlink do? In short, jlink lets you create a custom Java Runtime Environment (JRE) that includes only the modules your application actually needs — no extras, no overhead. Why use jlink? Smaller runtime size: You don’t need the entire JDK — just the required modules. Faster startup: Fewer modules mean less to load at runtime. Improved security: Removes unused APIs that could increase the attack surface. Perfect for containers: Ideal when building lightweight Docker images. Basic Syntax jlink --module-path $JAVA_HOME/jmods:mods \    --add-modules com.example.app \    --output custom-jre Explanation: --module-path: location of your modules and JDK’s jmods folder --add-modules: which modules to include in the runtime --output: directory where the new runtime will be created Example 1 — Minimal JRE for a CLI App Let’s say your modular app only depends on java.base and java.sql: jlink --module-path $JAVA_HOME/jmods \    --add-modules java.base,java.sql \    --output myruntime This produces a tiny JRE (a few dozen MBs instead of hundreds). Now, you can run your app like this: ./myruntime/bin/java -m com.example.Main Example 2 — Building a Runtime for a Modular Application Assume you have a compiled app in mods/com.example.app: jlink --module-path $JAVA_HOME/jmods:mods \    --add-modules com.example.app \    --launcher runapp=https://lnkd.in/dWs2jFgG \    --output app-runtime This generates a self-contained runtime with a pre-configured launcher (./app-runtime/bin/runapp). Bonus Tip Combine jlink with jpackage to generate native installers or executables for Linux, macOS, or Windows. In short: jlink transforms how we ship Java apps — from bulky runtimes to sleek, optimized distributions. If you’re building microservices, CLI tools, or containerized apps, this tool is your friend. #Java #JDK #jlink #Performance #DevTools #Microservices #JVM #CloudNative #Containers

🚀 Migration Highlight: Upgrading Spring Boot Projects from Java 17 to 21 If you’re still running your Spring Boot apps on Java 17 — it’s time to level up. Java 21 (the latest LTS) brings serious improvements that make your code faster, cleaner, and far more efficient — and Spring Boot 3.2+ is fully ready for it. 🔧 Why you should migrate: ⚡ Performance: Virtual Threads (Project Loom) deliver massive scalability for I/O-bound services. 🧠 Simplicity: Pattern Matching for switch, Record Patterns, and Sequenced Collections make your code elegant. 🧵 Concurrency: Structured Concurrency APIs simplify async workflows. 🛡️ Security & Support: Long-term support until 2032 — perfect for production. 💡 Steps to migrate 1️⃣ Update your toolchain Install JDK 21 (Temurin / Zulu / Corretto). Update your IDE (IntelliJ / VS Code / Eclipse) to recognize Java 21. 2️⃣ Update your build file Maven: <properties> <java.version>21</java.version> </properties> Gradle: java { toolchain { languageVersion = JavaLanguageVersion.of(21) } } 3️⃣ Update Spring Boot version Minimum: 3.2+ (for Loom & new language features). Example: <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>3.3.4</version> </parent> 4️⃣ Rebuild and test mvn clean verify java -version 5️⃣ Enable Virtual Threads (optional but recommended) spring: threads: virtual: enabled: true 📊 Before: Java 17 + Platform Threads Startup: ~3.4 s Throughput: 900 req/s After: Java 21 + Virtual Threads Startup: ~2.1 s Throughput: 2400 req/s Memory: ↓ 25% 🔍 My take: Java 21 is not “just another LTS.” It’s the foundation for the next era of Java — lightweight threads, cleaner syntax, and native-ready performance. Spring Boot 3.x + Java 21 feels modern, fast, and future-proof. If you’re maintaining production microservices or planning new ones, make this upgrade part of your Q4 roadmap — you’ll thank yourself later. Have you already migrated your services to Java 21? What’s the biggest gain you noticed? 👇 #SpringBoot #Java21 #Migration #ProjectLoom #Performance #DevOps #Microservices #Spring

🚀 Let’s Dive Into Java 8 — The Beginning of Modern Java! We all know Java has come a long way with its major LTS (Long-Term Support) versions: 👉 Java 8 → Java 11 → Java 17 → Java 21 → Java 25 Each version brought something powerful to the table, shaping the modern Java ecosystem we use today 💪 So let’s start with the foundation — Java 8, the version that completely transformed how we write Java code! In this post, I’ll walk you through the key features that made Java 8 revolutionary 👇 (And yes — in upcoming posts, we’ll explore the next LTS versions one by one!) ⚙️ 1. Functional Interfaces * A Functional Interface is an interface that contains only one abstract method, but it can also include default and static methods. * It serves as the foundation for functional programming in Java 8. * These interfaces enable lambda expressions and method references, allowing you to pass behavior (functions) as parameters. Common Functional Interfaces: Runnable, Callable, Predicate, Function, Consumer, Supplier ⚡ 2. Lambda Expressions Introduced to simplify functional interface implementations. Instead of creating a separate class to implement an interface, we can simply pass the logic directly as a lambda. 🌊 3. Stream API To process collections effectively and declaratively, Java 8 introduced the Stream API. It allows you to filter, map, sort, and reduce data in a functional way. 🔹 Built on functional interfaces (Predicate, Function, Consumer) 🔹 Works beautifully with lambda expressions 🔹 Supports parallel processing with .parallelStream() 🧩 4. Method References A shorthand for calling existing methods using :: 🎁 5. Optional Class Introduced to handle null values more gracefully and avoid NullPointerException. 🧱 6. Default & Static Methods in Interfaces Until Java 7, interfaces could only contain abstract methods. From Java 8 onward, interfaces can define: default methods (with implementation) static methods This allows interfaces to evolve without breaking existing codebases. 🧠 Multiple Inheritance with Interfaces Default methods re-introduced a potential diamond problem, but Java handles it with clear rules: 1️⃣ Class wins: If a class and an interface have the same method, the class method takes priority. 2️⃣ Interface conflict: If two interfaces define the same default method, the class must override it to resolve ambiguity. 3️⃣ You can call a specific interface method using InterfaceName.super.methodName(). interface A { default void greet() { System.out.println("Hello from A"); } } interface B { default void greet() { System.out.println("Hello from B"); } } class C implements A, B {   @Override   public void greet() {     A.super.greet();     System.out.println("Also from C");   } } #Java #Java8 #FunctionalProgramming #LambdaExpressions #StreamAPI #OptionalClass #JavaDeveloper #Coding #SoftwareDevelopment #LTS #SpringBoot #BackendDevelopment #JavaFullStackDeveloper #FullStackDeveloper #SoftwareEngineer #BackendEngineer

🔥 Java 25’s Secret Weapon: Compact Object Headers Can Save You 20% Memory Without a Single Code Change! ⸻ 🚀 Revolution Inside JVM — Java 25 Goes Compact! Java 25 has quietly delivered one of its most powerful JVM upgrades — Compact Object Headers (JEP 519). This isn’t just a minor optimization — it’s a real-world performance booster for enterprise-scale apps, especially huge monoliths. ⸻ 🧠 What Are Compact Object Headers? 1️⃣ Every Java object carries a “header” with identity, synchronization, and class metadata. 2️⃣ Traditionally, this header consumed around 12 bytes per object. 3️⃣ With Java 25, it’s now 8 bytes — compact, efficient, and smarter. 4️⃣ Enable it easily: -XX:+UseCompactObjectHeaders 👉 Result — smaller objects, faster cache access, fewer GC cycles, and noticeable throughput gains. ⸻ 🏗️ Why It’s a Game-Changer for Monoliths ✅ Save Memory: Millions of small objects? Expect up to 20% heap savings. ✅ Reduce GC Load: Smaller live set → fewer GC pauses. ✅ Boost Cache Efficiency: Compact objects fit better in CPU cache → improved latency. ✅ Zero Code Change: Just enable the flag — no refactoring, no risk. ✅ Future-Proof: The feature is stable and production-ready in Java 25. ⸻ 🎯 Mentor’s Action Plan — How to Adopt It ⭐ 1. Start with one heavy object-creation module. ⭐ 2. Enable the flag in staging and record memory/GC metrics. ⭐ 3. Compare heap size, pause times, and throughput. ⭐ 4. Gradually roll out to full monolith after validation. ⭐ 5. Share results with your team — educate, measure, iterate. ⸻ 📊 Early Benchmarks Show 1️⃣ ~22 % lower heap memory 2️⃣ ~15 % fewer GC events 3️⃣ ~10 % better throughput 💡 These results vary, but every large-scale Java app stands to gain real performance benefits. ⸻ 🧩 Mentor’s Thought “Performance wins often come not from rewriting systems, but from understanding the platform deeper. Java 25’s Compact Object Headers remind us — even small JVM-level improvements can create big business impact. Optimize smartly, measure everything, and lead with insight.” #Java25 #Performance #JVM #SystemDesign #Microservices #SpringBoot #JavaDeveloper #BackendEngineering #Mentorship ⸻ 📢 For Developers & Architects If you want a detailed breakdown (with diagrams, benchmarks, and JVM flag analysis), 💬 Comment “DETAIL” below — I’ll share a deep dive post soon! 👉 Follow me for more Java 25, Spring Boot, and System Design insights — explained in a mentor’s tone, not marketing hype. ⸻

🔥 Day 30 / 120 - Java Full Stack Journey 📌 Today's focus: Heap Memory & String Constant Pool in Java 💻 ✨ It's the 🎯 entry point of every Java program - the place where execution begins and logic takes life! 🚀 Definition of Heap Memory: Heap memory is the runtime memory area in Java where all objects and their instance variables are stored. It is created when the Java Virtual Machine (JVM) starts and is shared among all threads of the application. When you use the new keyword to create an object, that object is allocated in heap memory. 🔹 Key Points: It stores objects, arrays, and class instances. It is managed by the Garbage Collector (GC), which automatically frees memory of unused objects. It is shared by all threads in the program. Size of the heap can be set using JVM options: -Xms (initial heap size) -Xmx (maximum heap size) Example Code: public class Example {   public static void main(String[] args) {     Example obj = new Example(); // 'obj' is stored in heap memory   } } Definition of String Constant Pool: The String Constant Pool (SCP) is a special memory area inside the heap that stores unique string literals. It helps save memory by reusing immutable string objects instead of creating duplicates. When you create a string literal (using double quotes ""), Java first checks the String Constant Pool: If the string already exists, Java reuses the existing object. If it doesn’t exist, a new object is created and stored in the pool. 🔹 Key Points: The SCP is part of the heap memory. Only string literals and strings created using intern() are stored there. It helps in memory optimization. Strings are immutable, so sharing them is safe. Example Code: public class StringPoolExample {   public static void main(String[] args) {     String s1 = "Java";     // Stored in String Constant Pool     String s2 = "Java";     // Reuses the same object from SCP     String s3 = new String("Java"); // Created in heap memory, outside SCP     String s4 = s3.intern();   // Moves/links to SCP reference     System.out.println(s1 == s2); // true → both point to same SCP object     System.out.println(s1 == s3); // false → s3 is in heap, not SCP     System.out.println(s1 == s4); // true → s4 refers to SCP string   } } 💐 Deep Gratitude: 🎓 Anand Kumar Buddarapu Sir— my dedicated Mentor, for guiding with clarity & wisdom. 👔 Saketh Kallepu Sir — the visionary CEO whose leadership inspires progress. 🔥 Uppugundla Sairam — the energetic Founder who fuels us with motivation

☕🚀 Java 17 – The Modern LTS Every Developer Should Know! Java 17 is one of the most powerful Long-Term Support (LTS) releases — packed with modern language improvements, performance boosts, and cleaner code practices. Here are the top features you should know 👇 🔹 1️⃣ Sealed Classes What it is: A sealed class restricts which other classes can extend or implement it. Why it’s useful: Helps you control your class hierarchy — making code safer and easier to maintain. public sealed class Shape permits Circle, Rectangle { } public final class Circle extends Shape { } public final class Rectangle extends Shape { } ✅ Restricts unwanted subclassing ✅ Improves security and maintainability 🔹 2️⃣ Pattern Matching for Switch (Preview) Before Java 17: Objects weren’t compatible with switch. Now: You can directly use objects and the compiler automatically casts them for you! In Java 17: switch (obj) {   case String s -> System.out.println("String length: " + s.length());   case Integer i -> System.out.println("Integer value: " + i);   case null -> System.out.println("Null value");   default -> System.out.println("Unknown type"); } ✅ No explicit casting ✅ Type-safe & null-safe ✅ Cleaner, modern syntax 🔹 3️⃣ Strong Encapsulation of JDK Internals Java 17 hides internal APIs (like sun.misc.*) to improve security and modularity. Previously, many developers used these internal classes — leading to unsafe, unstable code. sun.misc.* --> Unsafe memory ops --> Hidden sun.reflect.* --> Reflection internals --> Hidden sun.security.* --> Security helpers --> Hidden 🔹 4️⃣ Support for macOS/AArch64 ✅ Native support for Apple Silicon (M1/M2 Macs). 💡 Faster performance and better compatibility for macOS developers. 🔹 5️⃣ Foreign Function & Memory API (Incubator) What it is: Lets Java call native libraries safely without using old JNI. Why it matters: Faster, cleaner, and safer interoperability with C/C++ code. 🔹6️⃣ Enhanced Random API Java 17 improves the Random API for more flexible random number generation: Random random = new Random(); random.ints(5, 0, 100).forEach(System.out::println); ✅ Generates multiple numbers in a range ✅ Cleaner and stream-friendly 7️⃣ New macOS Rendering Pipeline New rendering pipeline improves graphics performance for Swing/JavaFX apps on macOS 🍏 8️⃣ Other Key Improvements 🗑️ Applet API removed (legacy feature cleanup) ⚙️ GC improvements (G1, ZGC performance boost) 🧩 Removed experimental AOT/JIT compilers for simpler JVM structure 🔍 Summary Java 17 focuses on: ✨ Cleaner, safer, maintainable code (Sealed Classes, Pattern Matching) 🧠 Modern platform support (Apple Silicon, rendering updates) 🛡️ Security & modularity (Strong encapsulation) ⚡ Performance optimization (Better GC & APIs) #Java17 #JavaLTS #Programming #SoftwareDevelopment #CleanCode #JavaDevelopers #FullStackDevelopment #TechTrends #CodingTips #JavaFeatures #JavaFullStackDevelopment #BackendDevelopment #CodeWithMohan

4 + year java experience question 💻 Core Java and OOPs While you should know the basics, the questions will be geared towards the "why" and "how" of their application: OOP Principles: Go deeper than defining Encapsulation, Inheritance, Polymorphism, and Abstraction. Be ready to explain how you applied them in a project to solve a specific problem (e.g., using an Abstract Class vs. an Interface in a design). String Concepts: Explain the differences between String, StringBuffer, and StringBuilder, and more importantly, why String is immutable and the practical implications of that design decision. == vs. equals(): Be prepared to explain the difference, especially in the context of custom objects and overriding the equals() and hashCode() methods. JVM, JRE, JDK: Explain their roles and the Java Memory Model (Heap, Stack, Method Area). Exception Handling: Describe the difference between checked and unchecked exceptions and how to design a robust exception handling strategy in a large application. 🧵 Concurrency and Multithreading This is a critical area for mid-level roles, as concurrency issues are common in enterprise applications. Creating Threads: The two main ways: extending Thread and implementing Runnable. Synchronization: Explain the synchronized keyword (method and block) and its effects. Thread Communication: How do wait(), notify(), and notifyAll() work, and what's the difference? Concurrency Utilities: Knowledge of classes from java.util.concurrent (e.g., ExecutorService, Future, Callable, ConcurrentHashMap). Deadlock and Race Conditions: Define them and explain strategies for prevention and detection. volatile keyword: Explain its purpose and limitations regarding atomicity. 🗃️ Collections Framework Expect scenario-based questions focusing on performance and use-case: Basic Differences: Distinguish between List, Set, and Map. Implementation Choice: When would you use a LinkedList over an ArrayList? (Focus on access, insertion, and deletion performance). HashMap Internals: Explain how get() and put() methods work, including concepts like hashing, collision resolution, and the change to using balanced trees in later Java versions (Java 8+). Thread-Safe Collections: Differences between Collections.synchronizedMap() and ConcurrentHashMap. 🏗️ Design Patterns and Principles A 4-year developer is expected to understand and apply common design patterns. Common Patterns: Be ready to discuss and implement Singleton (especially thread-safe lazy loading), Factory, Observer, and Strategy patterns. SOLID Principles: Explain each principle (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion) and give real-world Java examples of how you adhere to them. ⚙️ Modern Java and Frameworks Questions will likely involve modern features and your experience with enterprise frameworks. Java 8+ Features: Be proficient in Lambda Expressions.