发布时间：2018-08-29 04:13:34

原文地址：http://www.oodesign.com/composite-pattern.htmlComposite PatternMotivationThere are times when a program needs to manipulate a tree data structure and it is necessary to treat both Branches as well as Leaf Nodes uniformly. Consider for example a program tha.........【阅读全文】

发布时间：2018-08-29 04:12:47

原文地址：http://www.oodesign.com/bridge-pattern.htmlBridge PatternMotivationSometimes an abstraction should have different implementations; consider an object that handles persistence of objects over different platforms using either relational databases or file sys.........【阅读全文】

发布时间：2018-08-29 04:11:58

原文地址：http://www.oodesign.com/adapter-pattern.htmlAdapter PatternMotivationThe adapter pattern is adapting between classes and objects. Like any adapter in the real world it is used to be an interface, a bridge between two objects. In real world we have adapters for.........【阅读全文】

发布时间：2018-08-29 04:10:54

原文地址：http://www.oodesign.com/null-object-pattern.htmlNull Object PatternMotivationThere are some cases when a system has to use some functionality and some cases when it doesn't. Let's say we have to implement a class that should send the results to a log file .........【阅读全文】

发布时间：2018-08-29 04:07:55

原文地址：http://www.oodesign.com/visitor-pattern.htmlVisitor PatternMotivationCollections are data types widely used in object oriented programming. Often collections contain objects of different types and in those cases some operations have to be performed on all the col.........【阅读全文】