【正文】 ch as the Javabased PC, as well as television sets, ovens, telephone and home puter, and so on, it is ideal. 8. Java is a multithreaded Java program can run more than one thread. For example, it can be a thread in a timeconsuming to plete the calculation, and other users to interact with the threads of dialogue. Therefore, users do not have to stop working, waiting for the Java puting timeconsuming process. In the multithreaded programming environment, it is often difficult because many things may occur at the same time. However, Java provides easytouse features simultaneously, so that the programming easier. 中文翻譯JAVA介紹作者：Martin Ngobye.出處：Computing Static Slice for Java ProgramsJava是被設(shè)計用來解決在上下文分布式的異構(gòu)網(wǎng)絡(luò)中應(yīng)用程序開發(fā)的問題。 object oriented, to take advantage of modern software development methodologies and to fit into distributed clientserver applications。設(shè)計和體系結(jié)構(gòu)的決定汲取了多種語言，例如Eiffel、 SmallTalk,、Objective C以及 Cedar/Mesa。同時，以上的需求完全是由收集的時髦詞語組成的，所以在開始以前讓我們來查看它們中的一些和它們的各自的優(yōu)點。一般認為像Lisp, TCL, 和 SmallTalk這樣一些語言十分適合于原型法的另一個理由，是因為它們不要求你受早期決定的約束——這些語言的語義是很豐富的。(inheritance)，而所有的類都是由Object根超類擴展而得，根超類下文會做介紹。New Data()——構(gòu)造一個新對象，且初始化當前時間。：允許在已經(jīng)存在的類的基礎(chǔ)上構(gòu)建新的類，當你繼承一個已經(jīng)存在的類時，那么你就復(fù)用了這個類的方法和字段，同時你可以在新類中添加新的方法和字段。5）動態(tài)綁定：是很重要的特性，它能使程序變得可擴展而不需要重編譯已存代碼。：任何類類型的所有值都可以同object類性的變量來代替。4）提供方法對象。若實現(xiàn)一個接口需要2個步驟：1）聲明類需要實現(xiàn)的指定接口。類似的API有：:clone方法是object一個保護方法，這意味著你的代碼不能簡單的調(diào)用它。：Java是強調(diào)類型的語言，每個變量都必須先申明它的類型，java中總共有8個基本類型：4種是整型，2種是浮點型，一種是字符型，被用于Unicode編碼中的字符，布爾型。除了簡單的類型，如數(shù)字和布爾算子之外，Java中的大部分都是對象。例如，難以想像，一個對象會繼承兩個完全不同的類的行為。鑒于在許多計算機系統(tǒng)中都采用IDL接口和CORBA對象系統(tǒng)，這種兼容性是重要的。Java源程序被編譯成類文件，它相當于程序的字節(jié)代碼表現(xiàn)。Java程序不可能造成計算機崩潰。由于Java的設(shè)計是要在小的計算機上運行，作為一種編程語言來說其系統(tǒng)是相對較小的。在多線程環(huán)境中的編程通常是困難的，因為許多東西可能同時出現(xiàn)。能干的人，不在情緒上計較，只在做事上認真；無能的人！不在做事上認真，只在情緒上計較。比如，它可以在一個線程中完成某一耗時的計算，而其它線程與用戶進行交互對話。程序可能(無意識地)修改內(nèi)存中的任何值，這就會造成問題。由于這些語言定義如此自由，每種編譯器及開發(fā)環(huán)境便各有不同了，這使程序的移植成為討厭的問題。字節(jié)代碼非常類似于機器指令，所以Java程序非常高效。很容易建立IDLJ編譯器。這就是說，每個類一次只能繼承一個別的類。out。(proxy)：1）指定接口要求所有代碼。，在這種模式中你可以指定當一個特定時間發(fā)生時回調(diào)對象上的方法。(Interface)說明類該做什么而不指定如何去做，一個類可以實現(xiàn)一個或多個interface。2）在運行時探察類的對象。equal用于測試一個對象是否同另一個對象相等。3）靜態(tài)綁定：若方法類型為priavte static final 編譯器會準確知道該調(diào)用哪個方法。:當多個方法具有相同的名字而含有不同的參數(shù)時。:構(gòu)造器的提出，構(gòu)造器是一種特殊的方法，構(gòu)造對象并對其初始化。，類是模板是藍圖，從類中構(gòu)造一個對象，即創(chuàng)建了這個類的一個實例(instance)。同樣的，程序員可以相對大膽的處理存儲器，當在Java語言里面編程的時候。為了在這些問題中幸存下來，Java必須是體系結(jié)構(gòu)中立的、可移植的以及可以被動態(tài)的修改。目標是開發(fā)一個小巧的、可靠性高的、可移植的、分布式的、實時的操作系統(tǒng)平臺。. . . . .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, networkwide 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 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, realtime 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 new 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 secure, distributed, network based enduser applications in environments ranging from networkembedded devices to the WorldWide Web and the desktop.The design requirements of Java are driven by the nature of the puting environments in which software must be deployed.The massive growth of the Internet and the WorldWide Web leads us to a pletely new way of looking at development and distribution of software. To live in the world of electronic merce 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 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.The Java system that emerged to meet these needs is simple, so it can be easily programmed by most developers。Java最初是作為研發(fā)方案的一部分而開發(fā)的，這個研究方案是為了給廣闊多樣的網(wǎng)絡(luò)設(shè)備和嵌入式系統(tǒng)開發(fā)高級的軟件。在異構(gòu)的網(wǎng)絡(luò)中，多平臺上運行會使傳統(tǒng)配置的二進制發(fā)送、釋放、更新、補丁等等無效。許多動態(tài)的語言像Lisp、TCL和 SmallTalk通常被應(yīng)用于原型構(gòu)造技術(shù)它們成功原因中的一個在于它們非常健壯——你沒有必要去擔心關(guān)于解除或破壞存儲器。所有的程序是由一定的屬性和行為對象組成的，不同的對象的訪問通過函數(shù)調(diào)用來完成，對象間所有的交流都是通過方法調(diào)用，通過封裝對象數(shù)據(jù)，很大限度上提高復(fù)用率。：usea ：依賴關(guān)系hasa ：聚合關(guān)