JasonChang

摘要： The Singleton Patternensures a class has only one instance, and provide a global point of access to it. 阅读全文

摘要： The Abstract Factory Pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes.implementation 阅读全文

摘要： The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.implementation 阅读全文

摘要： The Decorator Pattern attaches additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extendingfunctionality.implementation 阅读全文

摘要： The Observer Pattern defines a one-to-many dependency between objects so that when one object changes state, all of its dependents are notified and updated automatically. Observer Pattern = Publisher + Subcribersimplemenation: 阅读全文