Job description: Core Java Fundamentals JVM, JDK, JRE architecture & lifecycle

Compilation: javac bytecode JVM

Memory model: Stack vs Heap

Key concepts: final/finally/finalize, static, volatile, String immutability

Object-Oriented Programming

(OOP)

4 Pillars: Encapsulation, Abstraction, Inheritance, Polymorphism

Overloading vs Overriding, Abstract vs Interface

Multiple inheritance via default methods, DTO usage

Collections Framework List, Set, Map — internal logic & use cases

ArrayList vs LinkedList, HashMap internals

hashCode() & equals(), ConcurrentHashMap, Generics

Java 8+ Features Lambdas, Functional Interfaces, Streams API

Optional class, Method References

Predicate, Function, Consumer — key interfaces

Contemporary Java (11–21) Sealed classes, Records, Text blocks

var keyword, Pattern Matching, Switch enhancements

Exception Handling Checked vs Unchecked, Multi-catch, Custom exceptions

Common errors (NPE, OOM), Best practices

📌 Java Developer (Chennai)
🏢 Tekskills
📍 Chennai