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This article mainly introduces all the commonly used terms in the Java language, which have a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

AAA

Authentication: verifying the identity of the user and available network services; Authorization: opening the network service to the user according to the authentication result; Accounting: recording the user's usage of various network services and providing it to the billing system. Referred to as AAA system.

AWT

Abstract Window Toolkit (Abstract window Toolkit), the first generation of Java GUI toolkits, has been replaced by Swing, but Swing is an extension of AWT. AWT also contains a lot of content that is still frequently used in GUI programming, such as event handling and listening, layout manager, and so on. AWT is also part of JFC.

API

Application Programming Interface (Application programming Interface), the coding interface provided by languages, frameworks, and class libraries.

AOP

Aspect Oriented Programming (aspect-oriented programming) can be used to dynamically add functions to programs without modifying the source code through precompilation and runtime dynamic proxies.

BMP

Bean-Managed Persistent (persistence managed by Bean), a method in EJB in which Bean is responsible for persistence management. The synchronization (preservation) of Bean content needs to be implemented by writing its own code.

CALLBACK

CALLBACK is first of all based on multithreading, so don't talk about callbacks without thread calls. If the subclass calls the constructor of the parent class to call back, any constructor of TMD is called callback, because any object at least inherits Object and at least calls the constructor of Object during construction.

CALLBACK mechanism

When a main thread manages other threads, instead of polling to check the status of each thread, it notifies the main thread when a certain state occurs in the child thread, ah, someone is going to press me, ah, my value has reached 100. (the term is triggered an event) so that the main thread receives these messages and invokes the corresponding method according to the message type.

For example, I (main thread) take a bus to Beijing, when the bus arrives in Beijing, I will call the "get off" method. If I do not need to call back the mechanism, I will keep asking driver, have you arrived yet? If I ask more than three times and the driver is stronger than me, he will definitely hit me. If I use the call mechanism, it will run there with a child thread (which allows driver to assume the role). When it arrives, I will call "get off ()" instead of asking once after a while, so that I can save time to sleep or chat with the girls in the car.

CMP

Container-Managed Persistent (Container managed persistence), a method in EJB in which the container is responsible for the persistence management of entity beans, that is, the container is responsible for synchronizing (saving) entity beans updates to the database.

CORBA

Common Object Request Broker Architecture (Common object request Agent [scheduling] Program Architecture) is a set of standards used to define "distributed object systems" with OMG (Object Menagement Group) as the initiator and standard-setting unit. The purpose of CORBA is to define a set of protocols in which objects can interact with each other, no matter what language they are written in, no matter what machine and operating system they run on.

DTD

Document type Definition (document type definition), which establishes a set of rules for an XML document or collection of documents. It is not an independent technical specification itself, but a part of the specification. Document type declarations in XML documents can be either tag constraints or external documents with tag constraints. The sum of these two constraints is DTD. It specifies how XML documents are built.

DI

Dependency Injection (dependency injection), that is, the dependency relationship between components is determined by the container at run time, that is, the container dynamically injects some dependency into the component. The goal of dependency injection is not to bring more functions to the software system, but to improve the probability of component reuse and to build a flexible and scalable platform for the system. Through the dependency injection mechanism, we can specify the resources needed by the target and complete our own business logic through simple configuration without any code.

Care about where specific resources come from and by whom. The above is also excerpted from Xia Xin's Spring development guide. DI and IoC are synonyms.

EJB

Enterprise JavaBeans,Java defines a model for developing and publishing reusable server-side components, including Session beans,Entity beans and Message-driven beans, for developing enterprise-level applications.

Hibernate Hibernate is an open source Oamp R Mapping (object-relational mapping framework). It encapsulates JDBC with lightweight objects, so that Java programmers can manipulate the database with object programming thinking at will.

IDL Interface Definition Language (Interface definition language), a key feature of CORBA, is a language-neutral interface definition language. Each language that supports CORBA has its own IDL mapping.

IIOP

Internet Inter-ORB Protocol (Internet Internal object request broker Protocol), a protocol in Java that enables programs to interoperate with CORBA implementations of other languages.

IoC

Inversion of Control (inversion of Control), the relationship between programs is controlled by the container, rather than in the traditional implementation, the control is directly controlled by the program code, and the control is transferred from the application code to the external container. The transfer of control is called inversion. (above is excerpted from Xia Xin's Spring development guide)

I18N

Internationalization (internationalization), the length of the word is 20, and then take the first and last letters, with exactly 18 letters omitted in the middle.

JCA

Java Cryptography Architecture,Java encryption architecture, a framework in the java platform for accessing and developing encryption functions.

JTS

Java Transaction Service (Java transaction Service), a technical standard for distributed transaction management in Java, is based on CORBA object transaction Service (CORBA Object Transaction Service). Enables EJB and its clients to perform transactional operations; updates several Bean in the application and ensures that all changes can be committed or rolled back at the end of the transaction; relies on JDBC-2 drivers to support XA negotiation and thus the ability to perform distributed transactions through one or more resource managers

JNDI

Java Naming and Directory Interface (Java naming and Directory Service Interface), a technical specification in Java that uses directories and naming services, similar to JDBC, it consists of API and SPI. J2EE's directory service enables Java clients and Web layer Servlet to query user-defined objects, such as EJB and environment configuration items (such as the address of the JDBC driver)

JMS

Java Messaging Service (Java message Service), which uses point-to-point (one-to-one) or publish-subscribe (many-to-many) interactions to support asynchronous communication between J2EE applications; all messages can be set to have the characteristics of the services associated with them, from best-effects services to transactional services

JCP

Java Community Process (Java Community process), an open organization responsible for Java technology development and review of technical specifications, JCP voted on the request, and the expert group members of JCP are generally influential enterprises or organizations in the industry.

JNode

JNode is a special JVM that can be used without other OS? The Java program is run on the computer. It is a pity that it has just taken shape and cannot be practical.

JTA

Java Transaction API (Java transaction API), the technology of business partition in Java.

JSF

Java Server Faces, a new generation of Java Web application technology standard, absorbs many features of Servlet, JSP and other Web application frameworks. JSF defines an event-driven, component-based model for the launch of Web applications.

JNI

Java native programming interface. It is the abbreviation of Java Native Interface. He can.

Interoperate java code with applications and libraries written in other programming languages. Most of the other programming languages are cpendium and assembly languages. )

JDBC

Java DataBase Connectivity (Java database connection), the Java technology used to access relational databases, is only a technical standard. Accessing different relational databases requires corresponding JDBC specification implementation packages.

JSP

Java Server Pages (Java server-side pages), the technical standard used to create dynamic page content in the J2EE standard, is based on Servlet technology, and requires a server that supports this standard to run. One of the most commonly used JSP servers is Tomcat.

JFC

Java Foundation Classes (JAVA basic class), a collection of GUI components and other services that can simplify the development and deployment of desktop and Internet/Intranet applications, its core is Swing.

JVM

Java Virtual Machine (Java Virtual Machine), which is a fictional computer, is realized by simulating various computer functions on the actual computer. Java virtual machine has its own perfect hardware architecture, such as processor, stack, register and so on, as well as the corresponding instruction system. JVM shields the information related to the specific operating system platform, so that Java programs only need to generate the object code (bytecode) running on the Java virtual machine, and can run on a variety of platforms without modification. When the Java virtual machine executes the bytecode, it actually interprets the bytecode as a machine instruction execution on a specific platform.

JRE

Java Runtime Environment (Java runtime environment), a collection of environments necessary to run JAVA programs, including JVM standard implementation and Java core class libraries.

JSDK

Java Software Development Kit is equivalent to JDK and J2SE.

JDK

Java Development Kit (Java Development Kit): including the running environment, compilation tools and other tools, source code, etc., basically equivalent to J2SE.

J2ME

The Java 2 Micro Edition (JAVA2 Lite Edition) API specification is based on J2SE, but has been modified to suit the single requirements of a product. J2ME enables the JAVA program to be easily applied to phone cards, pagers and other small devices. It includes two types of components, namely, configuration and profile.

J2EE

Java 2 Enterprise Edition (JAVA2 Enterprise Edition), a set of extended standards for enterprise development using Java, must be based on J2SE and provide a way to design, develop, assemble and deploy enterprise applications based on components. The J2EE platform provides a multi-tier and distributed application model, the ability to reuse components, a unified and secure model and flexible processing and control capabilities. J2EE package includes EJB, JTA, JDBC, JCA, JMX, JNDI, JMS, JavaMail, Servlet, JSP and other specifications.

J2SE

Java 2 Standard Edition (JAVA2 Standard Edition), used to develop the foundation of Java programs, including compilers, gadgets, running environment, the standard version of SUN also includes all the source code of the core class library.

L10N

Localization (localization), similar to I18N, takes the first and last letters, with 10 letters omitted in the middle.

MVC

The abbreviation of Model View Controller is a macroscopic design pattern introduced in order to obtain a better system structure. Model represents the model layer of the system, view is the presentation layer of the model, and controller is responsible for the flow of business. Using MVC can make the hierarchy of the system clear and reduce the coupling of each part.

PI

Processing Instruction (processing instruction), which instructs the application to perform specific tasks in XML. The format is that it can only be part of the set of XML standard processing instructions that the parser can recognize. Sometimes it is also used by the application to transmit information that can be used to help parse, in which case there should be keywords in the application that can be used as the execution object of the processing instruction.

PO

Persisent object persistent object

POJO

Pure old java object or plain ordinary java object or what ever. English is too poor to understand the meaning of this sentence. Please let me know if you know it.

RADIUS

Remote Authentication Dial In User Service

The protocol is widely used in broadband narrowband authentication system, the front end is generally PPPoE or 802.1x.

RMI

Remote Method Invocation (remote method invocation), the basic technology of distributed programming in Java, EJB technology is also based on RMI. RMI allows you to use objects on other machines through the way you use objects on your own machine.

RTTI

Run-time type identification, type identification of execution period. When you have a reference that points to the base class, the RTTI mechanism allows you to find out the object it points to and the relevant information about the class. (another method provided by JAVA is the reflection [reflection / mapping] mechanism)

SERIALIZATION

Serialize. It is the foundation of all object depth CLONE, object storage and recovery, object remote call, that is to say, it is the basis of object pooling management and distributed reference. What can the J2EE platform do without it?

This mechanism allows us to implement lightweight persistence mechanisms.

SWT

SWT itself is only a set of low-level graphical interface API written by the Eclipse organization to develop the Eclipse IDE environment. So far, SWT has surpassed the AWT and SWING provided by SUN in terms of performance and appearance. At present, Eclipse IDE has been developed to version 2.1, and SWT is very stable.

SOA

Service-Oriented Architecture, service-oriented architecture, SOA is an architecture model, which can distribute, combine and use loosely coupled coarse-grained application components through the network according to requirements. The service layer is the foundation of SOA, which can be directly called by the application, so as to effectively control the human dependence of the interaction with the software agent in the system. Several key features of SOA: a coarse-grained, loosely coupled service architecture, which communicates between services through a simple and precisely defined interface, without involving the underlying programming interface and communication model.

SPI

Service Provider Interface (Service provider Interface), an application program interface provided by a provider that complies with a certain service standard. SPI should be compatible with the API standard of the service. Applications should generally be written based on API, unless the SPI contains functions that are not provided in API and must be used.

SableVM SableVM is a very simple JAVA virtual machine website written in C language.

WFC

The acronym of Windows Foundation Classes for Ja va, which he provided

The architecture of the Java software package, which supports for Windows operating systems and Dynamic HTML

Components of the object model.

WORA

The slogans of Write Once, Run Anywhere (write once, run everywhere) and Java can be achieved to a certain extent, and complex applications may need to be debugged on different platforms.

XML

The abbreviation of Extentsible Markup Language (Extensible markup language) is a meta-language used to define other languages, and its predecessor is SGML (Standard Universal markup language). It doesn't have a label set (tag set) or syntax rules (grammatical rule), but it has a syntax rule. Any XML document for any type of application and correct parsing must be well-formed, that is, every open tag must have a matching closing tag, must not contain the reverse order of the tag, and the sentence structure should meet the requirements of the technical specification. XML documents can be valid (valid), but they are not necessarily required to be valid. A valid document is a document that conforms to its document type definition (DTD). If a document meets the requirements of a schema, then the document is "schema valid".

XSL

Extensible Stylesheet Language (Extensible stylesheet language), which can change and transform data from one XML format to another XML format. It provides a defined stylesheet through which different formats can be converted. To avoid having to change the data because of a different representation, XSL makes the data or document content transparent to the presentation. Its approach is comparable to writing a Mini Program that converts data into other formats in java, and provides a standard interface.

A unit test tests a separate unit of work. In Java applications, a "separate unit of work" often refers to a method (but not always). In contrast, integration testing and receiving testing examine how multiple components interact. A unit of work is a task that does not depend on the completion of any other task.

Reflection (can also be called mapping) is a RUNTIME thing, complete class loading, class analysis, bean introspection and other functions, why JBUILDER typed the name of a class followed by a list of its member variables and methods for you to choose? If you want to know how many times a method of an object has been called, what method do you use? This knowledge allows you to analyze the cause of the error from a single line of Exception. As well as their own implementation of classloader, security management and other aspects of work.

Frame

A framework is a semi-finished product of an application. The framework provides a reusable common structure that can be shared between applications. Developers integrate the framework into their own applications and extend it to meet their specific needs. The difference between a framework and a toolkit is that the framework provides a consistent structure, not just a set of tool classes.

Persistence

It means that the life cycle of an object does not depend on whether the program is executed or not.

Namespace

Namespace is a mapping between an element prefix and URI (uniform Resource Identifier), which can be used to handle namespace conflicts and define data structures that allow parsers to handle conflicts. The XML namespace recommendation defines a mechanism for standardizing these names, which relies on URI to accomplish the task, as detailed later. Namespaces are made up of a XML element with a prefix, such as and, so that the XML parser can distinguish the names of the two elements without using completely different element names. It is often used in XML documents, as well as in schemas and XSL stylesheets or xml-related specifications.

Open and closed rule

Software entities should be extensible, but unmodifiable (Software Entities Should Be Open For Extension, Yet Closed For Modification), referred to as OCP, this law is the most important rule in OO, which means that we should be able to change the behavior of software entities without modifying the source code of software entities. Conforming to this law means the highest level of reusability and maintainability.

Thank you for reading this article carefully. I hope the article "what are all the commonly used terms in Java language" shared by the editor will be helpful to you. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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