What are the three major systems of Java?

The three major Java systems are Java SE, Java EE and Java ME. Detailed introduction: 1. Java SE is the foundation of the Java platform and is used to develop desktop applications, embedded systems and mobile devices; 2. Java EE is a platform for developing enterprise-level applications; 3. Java ME is for embedded A platform for developing for modern devices and mobile devices.

The operating system of this tutorial: Windows 10 system, Java19.0.1 version, Dell G3 computer.

The three major systems of Java refer to the Java platform, namely Java SE (Standard Edition), Java EE (Enterprise Edition) and Java ME (Micro Edition).

Java SE (Standard Edition):

Java SE is the foundation of the Java platform and is used to develop desktop applications, embedded systems, and mobile devices. It provides the core API (Application Programming Interface) of the Java programming language, including basic class libraries, development tools, and virtual machines (JVM, Java Virtual Machine). The characteristic of Java SE is cross-platform, that is, write once and run anywhere. Developers can write code once for different operating systems and then run it on each platform without having to rewrite and adjust the code.

Java EE (Enterprise Edition):

Java EE is a platform for developing enterprise-level applications. It is built on Java SE and provides more features and tools to meet the needs of large-scale distributed applications. Java EE includes various standard APIs and specifications, such as Servlet, JSP (JavaServer Pages), EJB (Enterprise JavaBeans), JMS (Java Message Service), etc. Java EE also provides some important services, such as transaction management, security, remote access, etc. Its goal is to simplify the development process of enterprise-level applications and provide high-performance, scalable and reliable solutions.

Java ME (Micro Edition):

Java ME is a platform developed for embedded devices and mobile devices. It is optimized for resource-constrained devices and environments with limited network connectivity. Java ME provides a streamlined set of class libraries and APIs, as well as configuration files and configuration tools, allowing developers to build applications in restricted environments. Java ME supports various devices, such as smartphones, PDAs (Personal Digital Assistant), TV set-top boxes, routers, etc. It is characterized by small size, flexibility, strong portability and low resource usage, making it suitable for developing lightweight applications.

Summary:

The three major systems of Java are Java SE, Java EE and Java ME. Java SE is the basic version, used to develop desktop applications and embedded systems; Java EE is the enterprise version, used to develop large-scale distributed applications; Java ME is the micro version, used to develop embedded devices and mobile device applications . These three systems complement each other and meet the needs of different application scenarios. As a programmer, if you are familiar with and master these three systems, you can choose the appropriate platform and tools according to project needs and develop efficient and reliable applications.

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