Java Classroom Training

Java Fundamentals introduce the core building blocks of the Java language, including syntax, data types, and control structures that define how a program is written and executed. Object-Oriented Programming (OOP) concepts focus on designing applications using classes and objects, emphasizing principles such as encapsulation, inheritance, polymorphism, and abstraction to create reusable, secure, and maintainable code.

The Java Collections Framework provides a set of classes and interfaces such as List, Set, and Map to store and manage groups of objects efficiently. It helps in performing common operations like searching, sorting, insertion, and deletion. Iterators are used to traverse collection elements safely. Generics enable writing type-safe and reusable code by allowing classes and methods to operate on specified data types, reducing runtime errors.

Thread lifecycle, synchronization, executors, and avoiding common pitfalls like race conditions and deadlocks.Multithreading allows a Java program to execute multiple threads simultaneously, improving application performance and responsiveness. Concurrency focuses on managing shared resources safely when multiple threads run at the same time. Java provides built-in tools such as synchronization, locks, and concurrent utilities to prevent issues like race conditions and deadlocks. Together, multithreading and concurrency help build efficient, scalable, and high-performance applications.

JDBC (Java Database Connectivity) is used to connect Java applications with relational databases and execute SQL queries directly. ORM (Object-Relational Mapping) frameworks like Hibernate and JPA allow developers to map Java objects to database tables, reducing the need to write complex SQL. ORM simplifies database operations such as CRUD and improves code maintainability. Together, JDBC and ORM help build efficient, scalable, and database-driven Java applications.

Spring is a powerful Java framework used to build enterprise applications with features like dependency injection and aspect-oriented programming. Spring Boot simplifies Spring development by providing auto-configuration, embedded servers, and production-ready features. Microservices architecture breaks applications into small, independent services that communicate through APIs, making systems more scalable, flexible, and easier to maintain.

RESTful API development involves designing and building web services that allow different applications to communicate over HTTP. It uses standard HTTP methods such as GET, POST, PUT, and DELETE to perform CRUD operations. REST APIs are stateless, lightweight, and scalable, making them ideal for modern web and mobile applications. They typically exchange data in JSON format and follow REST principles for clean and maintainable system design.

Unit testing focuses on verifying individual units of code to ensure they work as expected. JUnit is a popular testing framework used to write and execute test cases in Java applications. Mockito is used to create mock objects and simulate dependencies, enabling isolated testing of business logic. Together, they help improve code quality, reliability, and ease of maintenance.