关于这一点,《Java与模式》一书中的解释是:我们设计继承体系时,子类应该是可替代的父类的,是可替代关系,而不仅仅是IS-A的关系;而PPP一书中的解释是:从行为方式的角度来看,Square不是Rectangle,对象的行为方式才是软件真正所关注的问题;LSP清楚地指出,OOD中IS-A关系时就行为方式而言的,客户程序是可以对行为方式...
public static void main(String[] args) { Square square = new Square(); Client client = new Client(); client.f(square); } // 运行结果: // Exception in thread "main" java.lang.RuntimeException: rectangle's area is invalid // at com.yrunz.designpattern.service.mediator.Client.f(Client...
假设现在有矩形Rectangle，可以通过setWidth方法设置宽度，setLength方法设置长度，area方法得到矩形面积：深色...
=1{// 1、从消息队列中获取数据msg:=p.mq.Consume("monitor.topic")log:=msg.Payload()// 2、对数据进行字段提取操作matches:=p.pattern.FindStringSubmatch(log)iflen(matches)!=3{returnevent}record:=model.NewMonitoryRecord()record.Endpoint=matches[1]record.Type=model.Type(matches[2])// 3.存储...
设计模式(Design Pattern)是一套被反复使用、多数人知晓的、经过分类编目的、代码设计经验的总结,使用设计模式是为了可重用代码、让代码更容易被他人理解并且保证代码可靠性。 从定义上看,设计模式其实是一种经验的总结,是针对特定问题的简洁而优雅的解决方案。既然是经验总结,那么学习设计模式最直接的好处就在于可以站...
设计模式(Design Pattern)是一套被反复使用、多数人知晓的、经过分类编目的、代码设计经验的总结,使用设计模式是为了可重用代码、让代码更容易被他人理解并且保证代码可靠性。 从定义上看,设计模式其实是一种经验的总结,是针对特定问题的简洁而优雅的解决方案。既然是经验总结,那么学习设计模式最直接的好处就在于可以站...
through its base class interface, [the] derived object must not expect such users to obey preconditions that are stronger than those required by the base class." The ever-popular illustration of this is thesquare-rectangle example. Turns out a square is not a rectangle, at least behavior-...
Onecommon example involves shapeswith a Shape base class. Rectangle and Square subclasses behave differently enough that substituting subclasses and requesting the area may yield unexpected results. Using the Java libraries as an example,the Queue family of Java collection classeslooks promising for confo...
IfcRectangleHollowProfileDef IfcRectangleProfileDef IfcRectangularPyramid IfcRectangularTrimmedSurface IfcRecurrencePattern IfcReference IfcRegularTimeSeries IfcReinforcementBarProperties IfcReinforcementDefinitionProperties IfcReinforcingBar IfcReinforcingBarType IfcReinforcingElement IfcReinforcingElementType IfcReinforcingMesh ...
IfcRoundedRectangleProfileDef IfcSanitaryTerminalType IfcScheduleTimeControl IfcSectionedSpine IfcSectionProperties IfcSectionReinforcementProperties IfcSensorType IfcServiceLife IfcServiceLifeFactor IfcShapeAspect IfcShapeModel IfcShapeRepresentation IfcShellBasedSurfaceModel IfcSimpleProperty IfcSite IfcSIUnit IfcSl...