Top 30 Most Common Interview Questions For 10 Years Experience In Java You Should Prepare For
Written by
James Miller, Career Coach
Introduction
Preparing for Java interviews, especially with 10 years of experience, requires demonstrating a deep understanding of the language, its ecosystem, and practical application in building robust, scalable systems. Interviewers for senior roles look beyond basic syntax, probing your knowledge of concurrency, JVM internals, design patterns, and modern Java features. This comprehensive list covers 30 common interview questions for 10 years experience in Java, spanning core concepts, advanced topics like concurrency and performance, and key Java 8+ features. Mastering these areas will showcase your expertise and readiness for a senior Java developer position, helping you navigate the interview process confidently and effectively. Focus on providing nuanced answers that reflect your extensive practical experience with these concepts in real-world projects.
What Are interview questions for 10 years experience in java?
Interview questions for 10 years experience in Java are tailored inquiries designed to assess a candidate's mastery of the Java programming language and related technologies after a decade in the field. These questions move beyond foundational syntax and delve into complex topics such as advanced data structures, multithreading, JVM architecture, performance tuning, and distributed systems concepts. They evaluate not just theoretical knowledge but also practical problem-solving skills, architectural understanding, and experience with modern development practices and libraries. A candidate with 10 years of experience is expected to handle challenging scenarios, explain trade-offs, and discuss real-world applications of Java concepts, making these questions crucial for senior-level evaluations.
Why Do Interviewers Ask interview questions for 10 years experience in java?
Interviewers ask interview questions for 10 years experience in Java to gauge the depth and breadth of a candidate's expertise cultivated over a significant period. At this level, they seek individuals who can lead projects, mentor junior developers, and make critical architectural decisions. Questions focus on understanding complex system behavior, diagnosing performance bottlenecks, designing resilient applications, and leveraging advanced Java features effectively. They want to ensure the candidate possesses not just theoretical knowledge but also practical experience in applying concepts like concurrency control, memory management, and design patterns to build production-grade software. These questions help identify seasoned professionals capable of tackling complex challenges and contributing significantly to a development team.
Preview List
What are the main differences between an Abstract Class and an Interface in Java? When should each be used?
Explain the key principles of OOP and how Java implements them.
What is the difference between checked and unchecked exceptions?
How does Java handle memory management and garbage collection?
What are the differences between == and .equals() in Java?
What is the Java Collections Framework? What are the main interfaces?
Explain the difference between ArrayList and LinkedList. When to use each?
What is the Java Map interface and its common implementations?
Explain Java Generics and why they are useful.
What are the key features introduced in Java 8?
What is a lambda expression? Provide its basic syntax.
Explain the Stream API and its benefits.
What is a functional interface?
Explain how Java supports multithreading.
What is the difference between synchronized and volatile keywords?
How does the Executor framework improve thread management?
What are the common concurrency issues? How to avoid them?
What is the Java Memory Model?
Explain the difference between Stack and Heap memory in JVM.
What are JVM tuning and Garbage Collection strategies you have used?
What are some design patterns commonly used in Java?
Explain the Singleton pattern and how to implement it in Java.
What is dependency injection and how is it implemented in Java?
Why is Java platform independent?
What is the difference between final, finally, and finalize?
Explain immutability in Java. How to create an immutable class?
What is the difference between HashMap and Hashtable?
Describe Java Serialization and its use cases.
What are default and static methods in interfaces?
How do you handle backward compatibility when upgrading Java versions?
1. What are the main differences between an Abstract Class and an Interface in Java? When should each be used?
Why you might get asked this:
This fundamental question assesses your understanding of core OOP principles and how Java implements abstraction and code sharing using two distinct mechanisms, especially post-Java 8.
How to answer:
Highlight the differences in implementation (concrete methods, state vs. contract), inheritance models (single vs. multiple), and purpose. Mention Java 8 default methods and the blurred lines but retain the core distinction.
Example answer:
Abstract classes can have state, constructors, and implemented methods, used for related classes sharing a common base. Interfaces define contracts without state (mostly, pre-Java 8), allowing multiple inheritance of behavior, suitable for unrelated classes sharing functionality (like Runnable). Default methods in interfaces added behavior sharing but interfaces still primarily define capabilities.
2. Explain the key principles of OOP and how Java implements them.
Why you might get asked this:
This question ensures you grasp the foundational concepts of object-oriented design that underpin much of Java development and are critical for building maintainable systems.
How to answer:
Define Encapsulation, Inheritance, Polymorphism, and Abstraction. For each, explain how Java supports it using features like access modifiers, extends/implements, method overriding/overloading, and abstract classes/interfaces.
Example answer:
OOP principles are Encapsulation (bundling data/methods, using access modifiers), Inheritance (code reuse, single class inheritance via extends, multiple interface inheritance via implements), Polymorphism (method overriding for runtime polymorphism, overloading for compile-time), and Abstraction (hiding complexity via abstract classes/interfaces).
3. What is the difference between checked and unchecked exceptions?
Why you might get asked this:
Understanding exception handling is vital for writing robust code. This question tests your knowledge of Java's exception hierarchy and when different types are used.
How to answer:
Define each type based on the Exception hierarchy (RuntimeException subclasses are unchecked). Explain the compiler's requirement for checked exceptions (try-catch or throws) versus the lack thereof for unchecked.
Example answer:
Checked exceptions (subclasses of Exception excluding RuntimeException) must be handled or declared in a method's throws clause by the caller; the compiler enforces this. Unchecked exceptions (subclasses of RuntimeException) represent programming errors and don't require explicit handling or declaration.
4. How does Java handle memory management and garbage collection?
Why you might get asked this:
Senior developers need to understand memory allocation and garbage collection for performance tuning and debugging memory-related issues like leaks.
How to answer:
Describe the main memory areas (Heap, Stack). Explain that Java uses automatic garbage collection to free memory on the Heap occupied by unreachable objects. Mention different GC algorithms (generational GC, G1, etc.) and that System.gc() is only a hint.
Example answer:
Java manages memory automatically primarily via the Heap (for objects, shared) and Stack (method frames, local variables, thread-specific). The Garbage Collector (GC) automatically reclaims Heap memory from objects no longer reachable. Various GC algorithms (like Generational, G1) exist, managing memory in generations (Young/Old) for efficiency.
5. What are the differences between == and .equals() in Java?
Why you might get asked this:
A classic question testing a fundamental understanding of object comparison in Java, crucial for correctly implementing equality logic.
How to answer:
Explain that == compares references (memory addresses) for object types, while .equals() compares content/state (requires appropriate override in custom classes). Specifically mention String behavior.
Example answer:
== compares object references, checking if they point to the same memory location. .equals() compares the actual content or state of objects and can be overridden in a class to define logical equality. For primitive types, == compares values. For Strings, == checks if they are the same String object, .equals() checks if they have the same character sequence.
6. What is the Java Collections Framework? What are the main interfaces?
Why you might get asked this:
The Collections Framework is fundamental for data handling. Knowledge of its structure and key interfaces is essential for efficient data manipulation.
How to answer:
Describe it as a unified architecture for representing and manipulating collections. List the main interfaces: Collection (root), List, Set, Queue, and Map (separate hierarchy).
Example answer:
The Java Collections Framework provides interfaces and classes to represent and manipulate collections of objects. The main interfaces are Collection (root), List (ordered, allows duplicates), Set (unordered, unique elements), Queue (for processing elements in order), and Map (key-value pairs, unique keys, doesn't extend Collection).
7. Explain the difference between ArrayList and LinkedList. When to use each?
Why you might get asked this:
This assesses your practical understanding of choosing appropriate data structures based on usage patterns (read vs. write heavy).
How to answer:
Detail their underlying implementations (array vs. linked list). Explain the performance trade-offs for random access, insertion, and deletion in the middle. Provide use case examples.
Example answer:
ArrayList uses a dynamic array, offering fast random access (O(1)) but slower insertions/deletions in the middle (O(n)). LinkedList uses a doubly-linked list, slower for random access (O(n)) but faster for insertions/deletions at ends or middle (O(1) with iterator). Use ArrayList when reads dominate, LinkedList when insertions/deletions are frequent.
8. What is the Java Map interface and its common implementations?
Why you might get asked this:
Maps are crucial for key-value storage. Understanding different implementations helps in selecting the right one for specific needs (ordering, synchronization).
How to answer:
Define Map (key-value store, unique keys). Describe HashMap (no order, fast), LinkedHashMap (insertion order), TreeMap (sorted order), and ConcurrentHashMap (thread-safe, high performance).
Example answer:
The Map interface stores key-value pairs where keys are unique. Common implementations: HashMap is unordered and fast for basic operations; LinkedHashMap maintains insertion order; TreeMap stores elements in sorted order by keys; ConcurrentHashMap is a highly efficient, thread-safe alternative to Hashtable.
9. Explain Java Generics and why they are useful.
Why you might get asked this:
Generics are a core feature for type safety and code reusability. Knowledge is essential for working with modern Java APIs and writing robust code.
How to answer:
Explain that Generics allow classes, interfaces, and methods to operate on objects of various types while providing compile-time type safety. Mention benefits: type checks at compile time, eliminating casts, code reusability. Mention type erasure.
Example answer:
Generics enable creation of classes, interfaces, and methods that can handle different types safely at compile time. They prevent ClassCastException at runtime, eliminate the need for explicit type casting, and enhance code reusability. For example, List ensures the list only holds Strings. Generics are implemented using type erasure.
10. What are the key features introduced in Java 8?
Why you might get asked this:
Java 8 was a significant release. Senior developers are expected to be proficient with features like Lambdas and Streams for writing concise and efficient code.
How to answer:
List the major features: Lambda expressions, Functional Interfaces, Stream API, Default/Static methods in Interfaces, Optional, and the new Date-Time API. Briefly explain the purpose of each.
Example answer:
Key Java 8 features include Lambda expressions (functional programming), Functional Interfaces (target for lambdas), Stream API (declarative collection processing), Default/Static methods in Interfaces (backward compatibility, utility methods), Optional class (handling nulls gracefully), and the improved java.time Date/Time API.
11. What is a lambda expression? Provide its basic syntax.
Why you might get asked this:
Tests your understanding of a cornerstone feature of Java 8, essential for writing modern, functional-style code.
How to answer:
Define it as an anonymous function. Provide the basic syntax patterns: (parameters) -> expression or (parameters) -> { statements }. Explain its use with functional interfaces.
Example answer:
A lambda expression is an anonymous function providing a concise way to represent an instance of a functional interface. Basic syntax is (parameters) -> expression for single expressions or (parameters) -> { statements; } for multiple statements. E.g., (a, b) -> a + b for a simple sum.
12. Explain the Stream API and its benefits.
Why you might get asked this:
Assesses your ability to process collections efficiently and declaratively using modern Java constructs, especially for parallel processing.
How to answer:
Describe it as a sequence of elements supporting aggregate operations. List benefits: declarative code, potential for parallelism, fluent API, improved readability for collection processing.
Example answer:
The Stream API provides a way to process sequences of elements using operations like filter, map, reduce. It allows for declarative, pipeline-based code, can leverage multi-core processors for parallel processing, and results in more concise and readable code compared to traditional loops for collection manipulation.
13. What is a functional interface?
Why you might get asked this:
Understanding functional interfaces is key to using lambda expressions effectively and working with Java 8+ features and APIs.
How to answer:
Define it as an interface with exactly one abstract method. Mention the @FunctionalInterface annotation (optional but recommended). Explain its purpose as a target type for lambda expressions and method references.
Example answer:
A functional interface is an interface that contains exactly one abstract method. It acts as a target type for lambda expressions and method references. It can have any number of default or static methods. Examples include Runnable and Comparator. The @FunctionalInterface annotation is used to indicate intent and ensure correctness.
14. Explain how Java supports multithreading.
Why you might get asked this:
Concurrency is critical for performance in modern applications. This tests your knowledge of Java's built-in mechanisms for concurrent programming.
How to answer:
Mention the Thread class and Runnable interface. Discuss the ExecutorService for managing threads efficiently via thread pools. Mention synchronization primitives (synchronized, volatile, Locks) and the java.util.concurrent package.
Example answer:
Java supports multithreading via the Thread class and Runnable interface. The Executor framework (ExecutorService, ThreadPoolExecutor) is preferred for managing threads via pools. Synchronization (synchronized keyword, volatile, Lock interface) is used for safe access to shared resources. The java.util.concurrent package provides rich utilities like ConcurrentHashMap, Semaphore, etc.
15. What is the difference between synchronized and volatile keywords?
Why you might get asked this:
Distinguishing between these is crucial for writing correct concurrent code and avoiding visibility/ordering issues.
How to answer:
Explain that synchronized provides both mutual exclusion (only one thread can access a block) and visibility (changes are flushed/refreshed). volatile only guarantees visibility (reads/writes go directly to main memory) but not atomicity for compound operations.
Example answer:
synchronized provides both atomicity (only one thread at a time in block/method) and visibility (ensures all threads see the latest changes). volatile only guarantees visibility; writes by one thread are immediately visible to others, but it doesn't ensure atomic operations on the variable unless it's a single read/write.
16. How does the Executor framework improve thread management?
Why you might get asked this:
Demonstrates awareness of best practices for managing threads in production systems, avoiding pitfalls of manual thread creation.
How to answer:
Explain that it decouples task submission from thread execution. It manages thread pools, reusing threads to reduce overhead and prevent resource exhaustion. It provides a higher level of abstraction (ExecutorService, Future).
Example answer:
The Executor framework decouples task submission from thread execution. It manages thread pools, reusing threads to minimize creation overhead and system resource consumption. It provides a structured way to submit tasks (Runnable, Callable) and manage their lifecycle, improving performance, control, and stability compared to managing raw threads manually.
17. What are the common concurrency issues? How to avoid them?
Why you might get asked this:
Tests your practical experience in debugging and preventing complex concurrency bugs that are hard to reproduce.
How to answer:
List common issues: Race conditions, Deadlocks, Livelocks, Starvation. Explain how to mitigate them using proper synchronization (locks, synchronized), using high-level concurrent utilities (ConcurrentHashMap, atomic variables), avoiding nested locks, and using immutable objects.
Example answer:
Common issues include Race Conditions (multiple threads access shared resource, outcome depends on timing), Deadlocks (threads blocked waiting for each other), Livelocks (threads react to each other but make no progress), and Starvation (a thread is perpetually denied resources). Avoid using synchronized, locks, java.util.concurrent utilities, careful resource ordering, and immutable objects.
18. What is the Java Memory Model?
Why you might get asked this:
Understanding JMM is crucial for writing correct and efficient concurrent code, especially regarding visibility and ordering.
How to answer:
Define it as specifying how threads interact with memory and how changes made by one thread become visible to others. Explain the "happens-before" relationship rules that guarantee visibility and ordering.
Example answer:
The Java Memory Model (JMM) defines how threads access memory and how changes made by one thread are visible to others. It specifies rules governing thread interactions with main memory and thread-local caches, crucial for understanding concurrency guarantees provided by keywords like volatile, synchronized, and final, ensuring visibility and ordering through "happens-before" relationships.
19. Explain the difference between Stack and Heap memory in JVM.
Why you might get asked this:
Fundamental JVM knowledge, important for understanding variable scope, object lifetime, and potential memory issues.
How to answer:
Explain that Stack memory is thread-specific, stores local variables and method call frames, and is short-lived. Heap memory is shared among all threads, stores objects, and is managed by the Garbage Collector.
Example answer:
Stack memory is thread-specific and stores primitive local variables and references to objects (not the objects themselves), along with method call frames. It's cleaned up automatically when the method finishes. Heap memory is shared across all threads and is where objects are stored. It's managed by the Garbage Collector.
20. What are JVM tuning and Garbage Collection strategies you have used?
Why you might get asked this:
A senior developer must understand how to monitor and optimize application performance at the JVM level.
How to answer:
Discuss experience with different GC algorithms (e.g., G1, Parallel, CMS - though CMS is deprecated), tuning heap sizes (-Xms, -Xmx), metaspace size, and monitoring tools (JConsole, VisualVM, JFR). Mention strategies like optimizing object creation or identifying memory leaks.
Example answer:
I've tuned JVM using flags like -Xms/-Xmx for heap size and adjusting GC algorithm based on workload (e.g., G1 for balanced throughput/latency, Parallel for throughput). I use tools like VisualVM/JConsole/JFR to monitor memory usage, GC activity, and identify potential leaks or performance bottlenecks, tailoring GC settings for specific application profiles.
21. What are some design patterns commonly used in Java?
Why you might get asked this:
Tests your knowledge of established solutions to common software design problems, indicating ability to write maintainable and understandable code.
How to answer:
List several patterns from different categories (creational, structural, behavioral) that are frequently encountered in Java development (e.g., Singleton, Factory, Strategy, Observer, Decorator, Builder). Briefly mention their purpose.
Example answer:
Common patterns include Creational (Singleton, Factory, Builder), Structural (Decorator, Adapter, Facade), and Behavioral (Strategy, Observer, Template Method). For example, Factory for object creation, Singleton for a single instance, Strategy for interchangeable algorithms, Observer for dependency notification, Builder for complex object construction.
22. Explain the Singleton pattern and how to implement it in Java.
Why you might get asked this:
A very common pattern question. Tests understanding of its purpose and, crucially, thread-safe implementation variations.
How to answer:
Explain its purpose (single instance, global access). Describe various implementation methods, focusing on thread-safe approaches: Eager initialization, Lazy initialization with synchronized method or double-checked locking, and the Enum singleton (considered the best thread-safe approach).
Example answer:
The Singleton pattern ensures a class has only one instance and provides a global access point. Implementations include: eager (instance created at class load), lazy (getInstance() synchronized, or double-checked locking), or the robust, thread-safe Enum singleton. The Enum approach is generally preferred as it handles serialization and reflection issues automatically.
23. What is dependency injection and how is it implemented in Java?
Why you might get asked this:
Tests your understanding of a core principle for building loosely coupled, testable applications, often used with frameworks.
How to answer:
Define DI as a design principle where an object receives its dependencies from an external source rather than creating them itself. Explain common implementation methods (constructor injection, setter injection, field injection) and mention frameworks like Spring or Guice as primary tools.
Example answer:
Dependency Injection (DI) is a technique where an object's dependencies are provided externally, rather than the object creating them. This promotes loose coupling and testability. In Java, it's commonly implemented via Constructor Injection, Setter Injection, or Field Injection, often facilitated by frameworks like Spring or Guice, which manage the lifecycle and wiring of dependencies.
24. Why is Java platform independent?
Why you might get asked this:
A classic question about one of Java's core selling points. Tests understanding of the JVM's role.
How to answer:
Explain that Java source code compiles into bytecode (.class files), not native machine code. This bytecode is then executed by the Java Virtual Machine (JVM), which is platform-specific. The JVM provides the abstraction layer that makes the compiled bytecode runnable on any platform with a compatible JVM.
Example answer:
Java is platform independent because its source code is compiled into bytecode, which is platform-neutral. This bytecode is then executed by the Java Virtual Machine (JVM), which is specific to each platform. The JVM acts as an interpreter between the bytecode and the underlying operating system/hardware, enabling "Write Once, Run Anywhere".
25. What is the difference between final, finally, and finalize?
Why you might get asked this:
Tests understanding of three distinct keywords/concepts that sound similar but have very different purposes.
How to answer:
Define final (modifier for variables, methods, classes), finally (block in try-catch for cleanup), and finalize() (method called by GC, now deprecated/discouraged). Emphasize their distinct roles.
Example answer:
final is a keyword used as a modifier for variables (constant), methods (cannot be overridden), or classes (cannot be subclassed). finally is a block associated with a try-catch statement, guaranteed to execute regardless of whether an exception occurred or was caught, used for cleanup. finalize() is a method of Object potentially called by the Garbage Collector before reclaiming memory, deprecated and unreliable.
26. Explain immutability in Java. How to create an immutable class?
Why you might get asked this:
Immutability is a crucial concept for thread safety and simpler reasoning about state. Tests your ability to design immutable objects.
How to answer:
Define immutability (state cannot change after creation). List the steps to create an immutable class: make the class final, make all fields private and final, initialize all fields via the constructor, don't provide setters, and handle mutable fields carefully (defensive copying).
Example answer:
An immutable object's state cannot be modified after it's created. To create an immutable class: declare the class as final, make all fields private final, initialize fields via the constructor, provide no setter methods, and if fields are mutable objects, create defensive copies in the constructor and getter methods.
27. What is the difference between HashMap and Hashtable?
Why you might get asked this:
Tests knowledge of legacy vs. modern Collections Framework classes and their key differences in thread safety and null handling.
How to answer:
Highlight the main differences: Hashtable is synchronized (HashMap is not), and Hashtable does not allow null keys or values (HashMap allows one null key and multiple null values). Mention that HashMap is generally preferred when synchronization is not needed, and ConcurrentHashMap is used for thread-safe scenarios.
Example answer:
The key differences are synchronization and null handling. Hashtable is synchronized (thread-safe but slower in concurrent use) and does not allow null keys or values. HashMap is not synchronized (faster but not thread-safe) and allows one null key and multiple null values. ConcurrentHashMap is the modern thread-safe alternative to Hashtable.
28. Describe Java Serialization and its use cases.
Why you might get asked this:
Tests understanding of object persistence and data transfer mechanisms, common in I/O and networking scenarios.
How to answer:
Define serialization as converting an object's state into a byte stream. Mention the requirement for a class to implement the Serializable marker interface. List common use cases: persisting objects to disk, sending objects over a network, deep cloning, caching. Mention transient keyword.
Example answer:
Serialization is the process of converting an object's state into a byte stream, and deserialization is the reverse. Classes must implement java.io.Serializable. Use cases include persisting object state to files or databases, sending objects across a network connection (like RMI), deep cloning objects, and caching object states. The transient keyword excludes fields from serialization.
29. What are default and static methods in interfaces?
Why you might get asked this:
Tests your knowledge of key features introduced in Java 8 that enhance interface capabilities and enable backward compatibility.
How to answer:
Explain that default methods (default keyword) provide concrete implementations in interfaces, allowing new methods to be added without breaking existing implementing classes. Static methods (static keyword) are utility methods associated with the interface itself, not an instance, similar to static methods in classes.
Example answer:
Default methods, introduced in Java 8, allow adding new methods with implementations to interfaces without affecting existing implementors, supporting backward compatibility. Static methods in interfaces are utility methods bound to the interface type itself, callable directly on the interface (e.g., Interface.staticMethod()), similar to static methods in classes.
30. How do you handle backward compatibility when upgrading Java versions?
Why you might get asked this:
A practical question for senior roles, assessing your experience with migration challenges and ensuring stability during technology updates.
How to answer:
Discuss strategies like testing thoroughly with different Java versions, identifying deprecated/removed APIs, using migration analysis tools, refactoring code incrementally, and relying on build tools (Maven/Gradle) for dependency management and compiler compliance levels. Mention staying updated on release notes.
Example answer:
Handling compatibility involves rigorous testing on target Java versions, reviewing release notes for deprecated/removed APIs, and using tools like jdeps or IDE features for migration analysis. I ensure code compiles with compliance levels set to the previous version initially, refactor usage of outdated features gradually, and leverage build tools to manage dependencies compatible with the new Java version, performing incremental upgrades where possible.
Other Tips to Prepare for a interview questions for 10 years experience in java
Beyond mastering these specific interview questions for 10 years experience in Java, focus on demonstrating your depth of experience and practical application. Prepare to discuss real-world problems you've solved, architectural decisions you've made, and challenges you've overcome. "Show, don't just tell" is key; back up your answers with concrete examples from your projects. Consider using resources like the Verve AI Interview Copilot at https://vervecopilot.com to practice articulating your thoughts under pressure. As one expert puts it, "A senior interview isn't just about knowing the answers, but explaining the 'why' and 'how' based on experience." Use the Verve AI Interview Copilot to simulate realistic scenarios and get feedback on your delivery. Practicing with the Verve AI Interview Copilot can significantly boost confidence. Remember, your 10 years of experience are your biggest asset – be ready to talk about your journey and lessons learned. Utilize the Verve AI Interview Copilot for targeted practice on specific technical areas and behavioral questions alike.
Frequently Asked Questions
Q1: How long should I spend preparing for a senior Java interview? A1: Preparation time varies, but consistent study over several weeks, focusing on key areas like concurrency and modern features, is typical.
Q2: Should I expect coding questions for 10 years experience in Java? A2: Yes, expect coding challenges, often focusing on algorithms, data structures, or practical problem-solving like multithreading issues.
Q3: Are system design questions common at this level? A3: Absolutely, system design is crucial. Be ready to discuss designing scalable, resilient applications using Java technologies.
Q4: How important are soft skills in these interviews? A4: Very important. Senior roles require leadership, communication, and collaboration. Be ready to discuss teamwork and mentoring.
Q5: Should I focus on specific frameworks like Spring? A5: While core Java is key, demonstrating expertise in widely used frameworks like Spring Boot is highly beneficial for a senior role.
Q6: How current should my Java knowledge be? A6: You should be comfortable with Java 8+, and ideally have exposure to newer features in Java 11, 17, or later LTS versions.
