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Core Java developer Training Topics

• JavaServer pages (JSP) and servlets

• Web frameworks (e.g., Struts and Spring)

• Service-oriented architecture/web services (SOAP/REST)

• Web technologies like HTML, CSS, JavaScript, and JQuery

• Markup languages like XML and JSON

• Object-oriented programming (OOP) concepts and patterns

• Abstract classes and interfaces

• Constructors

• File IO and serialization

• Collections: lists, maps, sets

• Access specifiers

• Exceptions (checked and unchecked)

• Generics

• Java keywords: static, final, volatile, synchronized, transient, this super, etc.

• Java virtual machine (JVM) and memory management

• Multithreading and synchronization

• Dependency injection

Topics Covered in our Advance Java Training

• Jenkins Day-2 Password is ProjectDec2020

• AI and machine learning

• Blockchain

• Python

• Amazon Web Services

• Hadoop/Big Data

• Mobile technologies (Android or OS)

• Advanced JavaScript framework (e.g., Angular, React, VueJS)

• Spring Boot/microservices

Skip to contentIntroduction to Java

Java is a powerful, high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation). It is widely used for building applications ranging from enterprise software to mobile apps, web applications, and even embedded systems.

Java follows the “Write Once, Run Anywhere” (WORA) principle, meaning that Java programs can run on any system with a Java Virtual Machine (JVM), making it platform-independent.

Key Features of Java

1. Platform Independence

Java code is compiled into bytecode, which can be executed on any system with a JVM, regardless of the underlying operating system.

2. Object-Oriented Programming (OOP)

Java follows the principles of Encapsulation, Abstraction, Inheritance, and Polymorphism, making it modular, reusable, and scalable.

3. Automatic Memory Management

Java has an automatic garbage collector that manages memory allocation and deallocation, reducing memory leaks and improving efficiency.

4. Multithreading Support

Java allows multiple threads to execute simultaneously, enabling better performance for concurrent applications.

5. Security and Robustness

Java provides built-in security features, such as bytecode verification, exception handling, and access control, making applications more reliable.

6. Extensive Libraries and APIs

Java comes with a rich set of built-in libraries for networking, file handling, database connectivity, GUI development, and more.

Java Editions

Java is divided into different editions to cater to various development needs:

1. Java Standard Edition (Java SE)

• Provides core Java libraries and functionalities.

• Used for building desktop and console applications.

2. Java Enterprise Edition (Java EE) (Jakarta EE)

• Includes APIs for web services, security, and distributed computing.

• Used for building enterprise-level applications.

3. Java Micro Edition (Java ME)

• Designed for mobile and embedded systems.

4. JavaFX

• Used for building rich graphical user interfaces (GUI).

Java Architecture

1. Java Virtual Machine (JVM)

The JVM is responsible for executing Java bytecode. It provides memory management, garbage collection, and security.

2. Java Runtime Environment (JRE)

The JRE includes the JVM and libraries required to run Java applications.

3. Java Development Kit (JDK)

The JDK includes the JRE, compiler, and development tools, allowing developers to write and compile Java code.

Core Java Concepts

1. Object-Oriented Programming (OOP) Principles

Java is based on four OOP principles:

• Encapsulation – Hides implementation details from users.

• Abstraction – Focuses on essential features, ignoring unnecessary details.

• Inheritance – Allows a class to inherit properties from another class.

• Polymorphism – Enables a single interface to be used for different types.

2. Java Data Types

Java supports different data types, including:

• Primitive Types – Integer, Float, Double, Boolean, Char, etc.

• Reference Types – Objects, Arrays, Strings, etc.

3. Exception Handling

Java provides a robust mechanism to handle runtime errors using try, catch, finally, and throw statements.

4. Multithreading

Java allows running multiple tasks simultaneously, improving performance in complex applications.

5. Java Collections Framework (JCF)

JCF provides dynamic data structures such as Lists, Sets, Maps, and Queues, making it easier to manage large amounts of data.

6. File Handling

Java provides built-in libraries for reading, writing, and manipulating files, making data storage and retrieval efficient.

Java Ecosystem and Tools

1. Java IDEs (Integrated Development Environments)

• Eclipse – Popular for enterprise and large-scale development.

• IntelliJ IDEA – Preferred for its advanced features and smart code suggestions.

• NetBeans – Open-source IDE with built-in support for Java EE.

2. Java Frameworks

• Spring Framework – Used for enterprise applications.

• Hibernate – Object-relational mapping (ORM) framework for database management.

• Struts – Web application framework for building Java-based web apps.

3. Build Tools

• Maven – Used for project dependency management.

• Gradle – A flexible and modern build automation tool.

Applications of Java

Java is widely used across industries for:

• Web Development – Java EE, Spring Boot.

• Mobile Development – Android apps using Java.

• Enterprise Applications – Banking, finance, and ERP systems.

• Big Data & Cloud Computing – Hadoop, Apache Spark.

• Game Development – LibGDX, jMonkeyEngine.

• IoT & Embedded Systems – Smart devices and automation.

Conclusion

Java remains one of the most popular programming languages due to its stability, performance, and versatility. Whether you’re building desktop applications, web services, or enterprise solutions, Java provides the necessary tools and frameworks to develop scalable and robust software.

Overview

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