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what is java me?

藏色散人

May 22, 2019 pm 03:59 PM

javaME, also known as J2ME, is a Java language platform provided for embedded consumer electronics devices such as set-top boxes, mobile phones and PDAs, including virtual machines and a series of standardized Java APIs. Java ME, Java SE, and Java EE together constitute the three major versions of Java technology, which are formulated through JCP.

what is java me?

Java ME, formerly known as J2ME (Java Platform, Micro Edition), is a Java language provided for embedded consumer electronics devices such as set-top boxes, mobile phones and PDAs. Platform, including virtual machine and a series of standardized Java APIs.

Java ME, Java SE, and Java EE together constitute the three major versions of Java technology, and they are also formulated through the JCP (Java Community Process).

Java ME is an integral part of Java 2 and is also known as J2SE and J2EE. Compared with J2SE and J2EE, the overall operating environment and goals of JAVA ME are more diverse, but the purpose of each product is more single, and the resource restrictions are more stringent. In order to achieve standardization and compatibility while trying to meet the needs of different aspects, the architecture of JAVA ME is divided into Configuration, Profile and Optional Packages (optional packages). Their combination and trade-off form a specific operating environment.

Configuration is mainly a vertical classification of devices. The classification is based on storage and processing capabilities, which defines virtual machine characteristics and basic class libraries. The standardized Configurations include Connected Limited Device Configuration (CLDC) and Connected Device Configuration (CDC).

Profile is built on Configuration and together constitute a complete operating environment. It classifies devices horizontally and targets market segments in specific fields. The content mainly includes class libraries and APIs for specific purposes. The profiles that have been standardized on CLDC include Mobile Information Device Profile (MIDP) and Information Module Profile (IMP), while the profiles that have been standardized on CDC include Foundation Profile (FP), Personal Basis Profile (PBP) and Personal Profile (PP).

Optional packages provide additional, modular and more diverse functionality independent of the previous two. Standardized optional packages include database access, multimedia applications, Bluetooth and more.

At this stage, the most popular application of Java ME is game software. Because compared with competitors (such as Sony and Nintendo) that require expensive special equipment and development tools, Java ME programs can be developed and simulated on a PC, and then easily deployed to the target machine, making it easy to develop, test and Publishing becomes easy and cheap. In fact, the uses and prospects of Java ME are much broader.

Developing Java ME programs generally does not require special development tools. Developers only need to install the Java SDK and download the free Sun Java Wireless Toolkit to start writing Java ME programs, compile and test them. In addition, the current main IDEs (Eclipse and NetBeans) all support Java ME development. Individual mobile phone developers such as Nokia and Sony Ericsson have their own SDKs for developers to develop programs compatible with their platforms.

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