java介紹外文翻譯共15頁

1、精選優(yōu)質(zhì)文檔-----傾情為你奉上專心---專注---專業(yè)外文原文Introduction to Javaautor：Martin Ngobye.source：Computing Static Slice for Java ProgramsJava is designed to meet the challenges of application development in the context of heterogeneous,

2、network-wide distributed environments. Paramount among these challenges is secure delivery of applications that consume the minimum of system resources, can run on any hardware and software platform, and can be extended

3、dynamically.Java originated as part of a research project to develop advanced software for a wide variety of network devices and embedded systems. The goal was to develop a small, reliable, portable, distributed, real-ti

4、me operating platform. When the project started, C++ was the language of choice. But over time the difficulties encountered with C++ grew to the point where the problems could best be addressed by creating an entirely ne

5、w language platform. Design and architecture decisions drew from a variety of languages such as Eiffel, SmallTalk, Objective C, and Cedar/Mesa. The result is a language platform that has proven ideal for developing secur

6、e, distributed, network based end-user applications in environments ranging from network-embedded devices to the World-Wide Web and the desktop.The design requirements of Java are driven by the nature of the computing en

7、vironments in which software must be deployed.The massive growth of the Internet and the World-Wide Web leads us to a completely new way of looking at development and distribution of software. To live in the world of ele

8、ctronic commerce and distribution, Java must enable the development of secure, high performance, and highly robust applications on multiple platforms in heterogeneous, distributed networks.Operating on multiple platforms

9、 in heterogeneous networks invalidates the traditional schemes of binary distribution, release, upgrade, patch, and so on. To survive in this jungle, Java must be architecture neutral, portable, and dynamically adaptable

10、.The Java system that emerged to meet these needs is simple, so it can be easily programmed by most developers; familiar, so that current developers can easily learn Java; object oriented, to take advantage of modern sof

11、tware development methodologies and to fit into distributed client-server applications; multithreaded, for high performance in applications that need to perform multiple concurrent activities, such as multimedia; and int

12、erpreted, for maximum portability and dynamic capabilities.Together, the above requirements comprise quite a collection of buzzwords, so let’s 精選優(yōu)質(zhì)文檔-----傾情為你奉上專心---專注---專業(yè)4.Through expands a class to obtain a new class

13、is called inheritance, but all classes are constructed by the object super root class of expansion, super root class of as follows can make the introduction.5.Object 3 principal characteristicsBehavior--- explained this

14、object can make what.Tate--- when the object exerts the method object reflection.Dentity--- and other similar behavior objects discrimination symbols.Each object has only indentity and among three characteristics they af

15、fect mutually.6. Relations among classes:Use-a:Dependent relationHas-a:Polymerization relationIs-a: inheritor relation -- example:A class has inherited B class, this time A class not only has B class of method, but also

16、has its own method(Individuality exists in general character)7.Structure object use structure:Structure proposing, the structure is one special method, the structure object and to its initialization.Example:A Data class

17、of structure calls DataNew Data () --- structure a new object, also initialize current time.Data happyday=new Data () --- an object evaluates an variable happyday, thus enables this object to be used many times, here be

18、stated the cause variable and the object variable are different.New returns the value is a quotation.Constructor characteristic:The constructor may have 0, one or many parametersThe constructor and the class have the sam

19、e nameA class may have many constructor. The constructor has not returned valueThe constructor always be together used with the new operator8. Over loading: When many methods have the same name when includes the differen

20、t parameter, then has the over loading Which method does the compiler have to choose invokes.9.Package : Java allow one or many classes to become together as group, is called package, to organizing duty easily, the stand

21、ard Java storehouse divides into many packages Java.Lang java.Util java, net and so on, the package is layered and all java packages are in java and in a javax package.10. Extendable thought: permit to construct new clas