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This article mainly introduces "detailed interpretation of the concept of J2ME and JVM". In daily operation, I believe many people have doubts about the detailed interpretation of the concept of J2ME and JVM. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "detailed interpretation of the concept of J2ME and JVM"! Next, please follow the editor to study!

Introduction to JVM

JVM (JavaVirtualMachine referred to as JVM), that is, the so-called Java virtual machine, is an abstract computer running all Java programs, and it is the running environment of Java language. It is one of the attractive features of Java***. In fact, JVM is an imaginary machine, which is realized by software simulation on the actual computer. JVM has its own imaginary hardware, such as processors, stacks, registers, etc., as well as a corresponding instruction system.

Characteristics of JVM

A very important feature of Java language is its platform independence. The use of JVM is the key to achieve this feature. If a general high-level language is to run on different platforms, it needs to at least be compiled into different object code. After introducing the Java language virtual machine, the Java language does not need to be recompiled when it runs on different platforms. The Java language uses the pattern JVM to shield the information related to the specific platform, so that the Java language compiler only needs to generate the object code (bytecode) running on the JVM and can run on a variety of platforms without modification. When executing the bytecode, JVM interprets the bytecode as the execution of machine instructions on a specific platform.

J2ME concept

Java ME, formerly known as J2ME (Java Platform, Micro Edition), is a Java language platform for embedded consumer electronic devices such as set-top boxes, mobile phones and PDA, including virtual machines and a series of standardized Java API. Together with Java SE and Java EE, it constitutes the three major versions of Java technology, and is also formulated through JCP (Java Community Process).

J2ME (Java2MicroEdition) is a part of Java2, which is called together with J2SE and J2EE. According to the definition of Sun: J2ME is a highly optimized Java operating environment, mainly for consumer electronic devices, such as cellular phone and videophone, digital set-top box, car navigation system and so on. J2ME technology was officially launched at the JavaOneDeveloperConference conference in 1999. It transplants the platform-independent features of Java language to small electronic devices and allows mobile wireless devices to share applications.

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