計算機專業(yè)畢業(yè)外文翻譯--托管代碼的優(yōu)點-資料下載頁
2025-05-11 17:42本頁面
【導讀】Microsoft中間語言與Java字節(jié)代碼共享一種理念：它們都是一種低級語言，語法很簡單(使用數(shù)字代碼，而不是文本代碼)，可以非常快速地轉(zhuǎn)換為內(nèi)部機器碼。對于代碼來說，這種精心設計的通用語法，有很大的優(yōu)。注意.NET的平臺無關(guān)性目前只是一種可能，因為在編寫本書時，.NET只能用于Windows平臺，但人們正。IL總是即時編譯的，而Java字節(jié)代碼常常是解。釋性的，Java的一個缺點是，在運行應用程序時，把Java字節(jié)代碼轉(zhuǎn)換為內(nèi)部可執(zhí)行代碼的過程會導致性能的損。Microsoft認為這會提高性能。其原因是編譯過程的最后一部分是在運行時進行的，JIT編譯器確切地知道程序。是x86兼容處理器或Alpha處理器，這超出了基本操作的范圍。程序作為源代碼顯示給開發(fā)人員，大多數(shù)后臺代碼不能用作源代碼。雖然這意味著其中的工作已大大減輕，但用戶仍需要檢查新的代碼，以確保項目仍可正確工作，因為這種轉(zhuǎn)換并不十分完美。是解釋性的語言，也可以編寫輸入量比較大的。有了后，就沒有必要在服務器端的
【正文】 t to use features that are not supported by .NET on managed types (for example, templates or multiple inheritance of classes). You will also find that you will need to use nonstandard C++ features (such as the __gc keyword shown in the previous code) when using managed classes. Because of the freedom that C++ allows in terms of lowlevel pointer manipulation and so on, the C++ piler is not able to generate code that will pass the CLR’s memory type safety tests. If it’s important that your code is recognized by the CLR as memory type safe, then you’ll need to write your source code in some other language (such as C or Visual Basic .NET). Visual J .NET The latest language to be added to the mix is Visual J .NET. Prior to .NET Framework , users were able to use J only after making a separate download. Now the J language is built into the .NET Framework. Because of this, J users are able to take advantage of all the usual features of Visual Studio .NET. Microsoft expects that most J++ users will find it easiest to use J if they want to work with .NET. Instead of being targeted at the Java runtime libraries, J uses the same base class libraries that the rest of the .NET pliant languages use. This means that you can use J for building Web applications, Windows Forms, XMLWeb services, and everything else that is possible— just as C and Visual Basic .NET can. Scripting languages Scripting languages are still around, although, in general, their importance is likely to decline with the advent of .NET. JScript, on the other hand, has been upgraded to JScript .NET. We can now write pages in JScript .NET, run JScript .NET as a piled rather than an interpreted language, and write strongly typed JScript .NET code. With there is no reason to use scripting languages in serverside Web pages. VBA is, however, still used as a language for Microsoft Office and Visual Studio macros. COM and COM+ Technically speaking, COM and COM+ aren’t technologies targeted at .NET, because ponents based on them cannot be piled into IL (although it’s possible to do so to some degree using managed C++, if the original COM ponent was written in C++). However, COM+ remains an important tool, because its features are not duplicated in .NET. Also, COM ponents will still work— and .NET incorporates COM interoperability features that make it possible for managed code to call up COM ponents and vice versa (this is discussed in Chapter 29). In general, however, you will probably find it more convenient for most purposes to code new ponents as .NET ponents, so that you can take advantage of the .NET base classes as well as the other benefits of running as managed code
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