刘涛的博客

摘要： IntentEnsure a class has only one instance, and provide a global point of access to it. Encapsulated “just-in-time initialization” or “initialization on first use”. ProblemApplication needs one, and only one, instance of an object. Additionally, lazy initialization and global access are necessary.Di 阅读全文

摘要： IntentSpecify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype. Co-opt one instance of a class for use as a breeder of all future instances. The new operator considered harmful. ProblemApplication “hard wires” the class of object to creat 阅读全文

摘要： IntentObject pooling can offer a significant performance boost; it is most effective in situations where the cost of initializing a class instance is high, the rate of instantiation of a class is high, and the number of instantiations in use at any one time is low.ProblemObject pools (otherwise know 阅读全文

摘要： Intent Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. Defining a “virtual” constructor... 阅读全文

摘要： Intent Separate the construction of a complex object from its representation so that the same construction process can create different representations. Parse a complex representation, create one of s... 阅读全文