javaapi结构（java api chm）

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英语翻译

System structure of Java

The people are very easy regard as the Java is the plait distance language that develops various applied procedure- use to weave to write the source document to combine to edit and translate them as the byte code.However, the conduct and actions plait distance language is just one of Java numerous useses, but real numerous advantages( include the terrace independence) of formation Java are its first floors structures.

The Java system structure of the integrity actually is to be combine by 4 modules:

● The Java plait distance language

● Java document format

● Java API

● JVM

The Java system structure is shown as diagram below, first Java of edit and translate the machine edit and translate Java of the binary system byte code class document, then the document of class be loaded the machine by the type in the Virtual Machine of Java to carry on add to carry, the type loads at the same time the machine will still add to carry the Java of original document of API Class, the type mainly add to carry the machine is responsible to add the source code Java document to carry, the conjunction and beginnings start to turn these documents of class hereafter, hand over to the performance in the Virtual Machine engine to circulate, the performance engine explain instruction of Java in the document of class in a specific way native operate system method to carry out, but the safety management machine will is outward the interview of a resources according to the safe strategy control instruction that establish in carry out process.

The Java performance method is not to edit and translate the performance but is to explain the performance, the same source code of top of different terrace edit and translate match the same binary system byte code of norm of Java, then hand over to support each from terrace of Virtual Machine explain the performance, three way for walks of" editted and translate first, behind explain, then performance" make the Java carry out" weave to write once, circulate everywhere", if what the Java application use is a standard Java API of 100% and did not adjust to use the native method directly, that can not add to modify a ground of usage on various terraces, such terrace irrelevant make network environment in different 构 or the built-in application is more convenient and realistic.The Java network ambulation brought a kind of all new software mode, at the foundation of the distribute type processing mode on, can pass software and datas the network deliver the customer to carry to go to, insuring the customer to carry to have the essential software thus to the data that browses and manipulates to deliver through a network, the Java system structure support incises the performance document of the one the small binary system byte code document Class document, but these documents can expand according to the applied demand dynamic state conjunction, dynamic state.

JVM and cores constituted the terrace of Java together, also being called the JRE( the Java Runtime Environment, the Java circulate environment), that terrace can build up at arbitrarily operate system up.Figure 1-1 showed the correlation between the Java different function mold piece, and they with application procedure, with relation between operate system.

Each module of 1-1 Javas of figure function says all

The code that the Java API weaves to write in advance, and press alike topic to be divided into manies to wrap.The Java API mainly is divided into the 3 greatest terraces:

● J2SE:(2 Platforms of Java, the Standard Edition)It include the core Java and GUIs in that terrace.

● J2EE:(2 Platforms of Java, the Enterprise Edition)That pack of in include to develop the Web application the type that procedure need and connect, there is Servlet, JavaServer Page, and JavaBean etc. of Enterprise.

● J2ME:(2 Platforms of Java, the Micro Edition)Should wrap the body now Java traditional advantage, for consumed a product to provide an already excellent the environment of hour of movement that turn, used for such as the pager machine, cellular phone or the automobile navigation systems.

Above be I analyzes for everyone of according to Microsoft of strategy of NET and Sun of according to structure system of Java strategy, my partner that below please...