hsx1612727380的专栏

Define an interface for creating an Object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.工厂方法模式通用类图工厂方法模式通用代码抽象产品类public abstract

Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.

Provide an interface for creating families of related or dependent objects without specifying their concrete classes.

Define a one-many dependency between objects so that when one object change state, all its dependents are notified and updated automatically.

Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.

Without violating encapsulation, capture and externalize an object’s internal state so that the object can be restored to this state later.

Represent an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates.

Allow an object to alter its behavior when its internal state changes, The object will appear to change its class.

Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language.

Use sharing to support large numbers of fine-grained objects efficiently.

Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation.

Convert the interface of a class into another interface clients ecpect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.

Define a family of algorithms, encapsulate each one, and make them interchangeable.

Singleton PatternEnsure a class has only one instance, and provide a global point of access to it.Singleton Pattern的通用代码饿汉式单例模式public class Singleton {private static final Singleton singleton = new Si

Define the skeleton of an algorithm in an operation, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm’s structur

Separate the construction of a complex object from its representation so that the same construction process can create different representations.建造者模式的通用类图建造者模式的通用代码产品类public class Product { /**

Provide a surrogate or placeholder for another object to control access to it.

Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype.

Encapsulate a request as object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.

Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicity, and it lets you vary interaction independen

Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object ha

Attach additional responsibities to an object dynamically keeping the same interface. Decorators provide a flexible alternative to subclassing for ectending functionality.

Decoople an abstraction from its implementation so that the two can vary independently.