java介紹外文翻譯

1、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, network-wide distributed envi

2、ronments. 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 dynamically.Java originated a

3、s 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-time operating platform. When t

4、he 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 new language platform. Design a

5、nd 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 secure, distributed, network based

6、 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 environments in which software

7、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 electronic commerce and distribu

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

9、validates 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.The Java system that emerged

10、 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 software development methodologi

11、es 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 interpreted, for maximum portabi

12、lity and dynamic capabilities.Together, the above requirements comprise quite a collection of buzzwords, so let’s examine some of them and their respective benefits before going on.are constructed by the object super roo

13、t class of expansion, super root class of as follows can make the introduction.5.Object 3 principal characteristicsBehavior--- explained this object can make what.Tate--- when the object exerts the method object reflecti

14、on.Dentity--- and other similar behavior objects discrimination symbols.Each object has only indentity and among three characteristics they affect mutually.6. Relations among classes:Use-a:Dependent relationHas-a:Polymer

15、ization relationIs-a: inheritor relation -- example:A class has inherited B class, this time A class not only has B class of method, but also has its own method(Individuality exists in general character)7.Structure objec

16、t use structure:Structure proposing, the structure is one special method, the structure object and to its initialization.Example:A Data class of structure calls DataNew Data () --- structure a new object, also initialize

17、 current time.Data happyday=new Data () --- an object evaluates an variable happyday, thus enables this object to be used many times, here be stated the cause variable and the object variable are different.New returns th

18、e value is a quotation.Constructor characteristic:The constructor may have 0, one or many parametersThe constructor and the class have the same nameA class may have many constructor. The constructor has not returned valu

19、eThe constructor always be together used with the new operator8. Over loading: When many methods have the same name when includes the different parameter, then has the over loading Which method does the compiler have to

20、choose invokes.9.Package : Java allow one or many classes to become together as group, is called package, to organizing duty easily, the standard Java storehouse divides into many packages Java.Lang java.Util java, net a

21、nd 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 class on existing classes , when you extend the class which already existed, then