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来源: BlogBus 原始链接: http://www.blogbus.com:80/blogbus/blog/index.php?blogid=18362&pg=6&cat= 存档链接: https://web.archive.org/web/20050120013817id_/http://www.blogbus.com:80/blogbus/blog/index.php?blogid=18362&pg=6&cat=
»ğÉÕ¾¶-make life easier Ê×Ò³ default (15) soft (6) db (4) java (14) workflow (2) develop (9) literature (7) shark·Ç¹Ù·½FAQ (7) python (1) ·ÖÒ³: [1] [2] [3] [4] [5] [6] [7] [8] [9] 04-07-21 06:40 ¡¶java & xslt¡·ÊDZ¾ºÃÊé Oreilly³öÆ·¡£½ñÌì±ßµ÷ÊÔ³ÌĞò±ß¿´£¬¾ÓÈ»¾Í¿´ÁËËÄÊ®¶àÒ³£¬¼ÓÉÏ×òÌì¿´µÄ¶şÊ®¶àÒ³£¬»ù±¾ÉϾÍÕÆÎÕÁËXSLT¼¼ÊõÁË¡£µ±È»²»ÄÜ¿¿Õâ±¾ÊéÕÆÎÕJava¡£ fireshort @ 06:40 | ÔĶÁÈ«ÎÄ | ÆÀÂÛ(0) | ÒıÓÃTrackback(0) | ±à¼ 04-07-14 04:41 Framework Vs Library Ò»¶Î¹ØÓÚFrameworkÓëLibraryµÄÇø±ğµÄºÜºÃµÄ½âÊÍ¡£ Additionally, a framework and library differ in the sense that the former is the latter turned inside out. What I mean is that if you use a library, the calling is done by the client. The calls are distinct and they do what they claim to be doing. In a framework, there are callbacks. Because there are callbacks, one should expect some kind of function pointers, virtual functions or interfaces. In fact, a framework uses polymorphism to let you add your object to the system already in place. A framework, then,is nothing but a structure with most of the plumbing already provided.Since a framework does not know what instance of objects will be added, it relies on the client objects adhering to certain interfaces. Because J2EE consists of callbacks (servlets -> service(Request, Response)), EJBs (ejbLoad, ejbStore, all container callbacks) it is a framework. On the other hand C consists of libraries because the client calls and the library function/method just does its stuff (e.g. atoi or printf in C). In a framework the call sequence is not in your control while in a library, it is. A good example other than above is Swing where you provide certain methods (e.g. getPreferredSize(), getMinimumSize() etc) and you wait to be called. Also, libraries don't maintain state. Frameworks do. Because a framework is a structure (while libraries are building blocks)and because a structure is difficult to change, bad design of the framework can quickly become difficult to use. An example is MFC framework which while working through callbacks, has a top heavy (meaning the base class consists of most methods) class and this makes it cumbersome to use. 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