Java and J2EE (Java 2 Platform, Enterprise Edition) and now called as Jakarta EE are related technologies, but they serve different purposes and are used in different contexts within the realm of Java development.
Java:
1. Core Java (Java SE):
- Purpose: Core Java, also known as Java Standard Edition (SE), is the fundamental and foundational part of the Java platform. It includes the basic libraries and functionalities needed for general-purpose programming.
- Use Cases: Core Java is used for developing standalone applications, command-line tools, desktop applications, and more. It provides the basic building blocks for Java development.
2. Key Features:
- Object-oriented programming
- Platform independence (Write Once, Run Anywhere - WORA)
- Robust memory management (garbage collection)
- Multi-threading support
- Exception handling
- Libraries for networking, I/O, and more
3. Example Applications:
- Console applications
- GUI applications (with JavaFX or Swing)
- Command-line tools
- Desktop applications
J2EE (Java 2 Platform, Enterprise Edition):
1. Purpose:
- Enterprise-Level Applications: J2EE, known as Java EE (Java Platform, Enterprise Edition) and now as Jakarta EE, is an extension of Java SE specifically designed for developing enterprise-level, distributed, and scalable applications.
- Use Cases: It is used for building large-scale applications, particularly web applications, that require features like transaction management, security, scalability, and robustness.
2. Key Features:
- Enterprise Beans (EJB): Components for building business logic in enterprise applications.
- Servlets and JSP (JavaServer Pages): For building web applications.
- JMS (Java Message Service): For messaging between distributed components.
- JTA (Java Transaction API): For managing transactions.
- JCA (Java Connector Architecture): For integrating with enterprise information systems.
- JavaMail: For email communication in Java applications.
- Security APIs, XML APIs, and more.
3. Example Applications:
- Large-scale web applications
- Enterprise resource planning (ERP) systems
- Customer relationship management (CRM) systems
- E-commerce applications
Comparison:
In summary, Java SE is the foundation for general-purpose Java development, while J2EE/Java EE extends Java SE with additional features and libraries specifically tailored for developing large-scale, distributed enterprise applications.
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