Best Java Coaching in Ghaziabad - Core & Advanced Java Training Institute

Installation of JDK 21, environment variables setup, byte code compilation vs execution. Detailed walkthrough of JVM Architecture: ClassLoader subsystems, Execution Engine (JIT Compiler, Interpreter), JVM Memory structure (Heap, Stack, Method Area/Metaspace, PC Registers). Data types, primitive vs reference types, type casting, operators, bitwise manipulations, control flow statements (if-else, switch expressions, loops), and break/continue labels. Memory allocations and Garbage Collection basics.

Deep-dive into Class and Object relationships, memory representation in heap, constructor overloading, constructor chaining (this() and super()). The 4 Pillars of OOP: Data Encapsulation and Access Modifiers (private, default, protected, public); Inheritance types, Method Overriding, Runtime Polymorphism, and Dynamic Method Dispatch; Abstract Classes vs Interfaces, Multiple Inheritance using Default and Static Interface Methods; Encapsulation with Java Beans and Immutable Classes. Introduction to SOLID design principles in enterprise software.

Comprehensive study of java.util package hierarchy: Collection interface, List implementations (ArrayList vs LinkedList vs Vector), Set implementations (HashSet, LinkedHashSet, TreeSet with Comparable/Comparator), Queue and Deque (ArrayDeque, PriorityQueue). Map hierarchy: HashMap internal hashing algorithm (bucket arrays, linked list to red-black tree conversion in Java 8+), LinkedHashMap, TreeMap, ConcurrentHashMap for thread-safe operations. Generics: Type parameters, bounded wildcards (? extends T, ? super T), and time complexity (Big-O) analysis of collection operations.

Robust error handling: Throwable hierarchy, Checked vs Unchecked Exceptions, try-catch-finally, try-with-resources (AutoCloseable), custom exception design, and best practices. Java I/O & NIO.2: Byte Streams, Character Streams, Buffered Streams, File reading/writing, and Object Serialization. Multithreading: Thread class, Runnable interface, thread states, race conditions, synchronized blocks, wait/notify inter-thread communication, ReentrantLock, ExecutorService thread pools, Callable, Future, and modern Java Virtual Threads.

Functional programming paradigm in Java: Lambda expressions, Built-in Functional Interfaces (Predicate, Function, Consumer, Supplier, BiFunction). Stream API in depth: Intermediate operations (filter, map, flatMap, distinct, sorted, limit, skip) and Terminal operations (collect, forEach, reduce, min, max, anyMatch). Collectors utility class, groupingBy, partitioningBy. Optional class for null-safety, modern Date-Time API (java.time), Text Blocks, Switch Pattern Matching, Sealed Classes, and Records.

Relational database connectivity with MySQL: JDBC Driver types, DriverManager, Connection, Statement vs PreparedStatement, CallableStatement, ResultSet metadata. Transaction management, commit, rollback, and savepoints. Connection pooling using HikariCP. Introduction to Object-Relational Mapping (ORM) with Hibernate: Entity mapping, annotations, session factory, HQL queries. Introduction to Spring Boot 3: Inversion of Control (IoC), Dependency Injection (DI), Spring Initializr, building and testing production-ready RESTful endpoints.