文章目录

Creational patterns（创建型模式）
- Abstract factory（抽象工厂模式）
- Builder（建造者模式）
- Factory method（工厂模式）
- Prototype（原型模式）
- Singleton（单例模式）
Structural patterns（结构型模式）
- Adapter（适配器模式）
- Bridge（桥接模式）
- Composite（组合模式）
- Decorator（装饰器模式）
- Facade（外观模式）
- Flyweight（享元模式）
- Proxy（代理模式）
Behavioral patterns（行为型模式）
- Chain of responsibility（责任链模式）
- Command（命令模式）
- Interpreter（解释器模式）
- Iterator（迭代器模式）
- Mediator（中介者模式）
- Memento（备忘录模式）
- Observer(or Publish/Subscribe)（观察者模式）
- State（状态模式）
- Strategy（策略模式）
- Template method（模板模式）
- Visitor （访问者模式）
转载说明

Creational patterns（创建型模式）

Abstract factory（抽象工厂模式）

recognizeable by creational methods returning the factory itself which in turn can be used to create another abstract/interface type.

javax.xml.parsers.DocumentBuilderFactory#newInstance()
javax.xml.transform.TransformerFactory#newInstance()
javax.xml.xpath.XPathFactory#newInstance()

Builder（建造者模式）

recognizeable by creational methods returning the instance itself.

java.lang.StringBuilder#append() (unsynchronized)
java.lang.StringBuffer#append() (synchronized)
java.nio.ByteBuffer#put() (also on CharBuffer, ShortBuffer, IntBuffer, LongBuffer, FloatBuffer and DoubleBuffer)
javax.swing.GroupLayout.Group#addComponent()
All implementations of java.lang.Appendable
java.util.stream.Stream.Builder

Factory method（工厂模式）

recognizeable by creational methods returning an implementation of an abstract/interface type.

java.util.Calendar#getInstance()
java.util.ResourceBundle#getBundle()
java.text.NumberFormat#getInstance()
java.nio.charset.Charset#forName()
java.net.URLStreamHandlerFactory#createURLStreamHandler(String) (Returns singleton object per protocol)
java.util.EnumSet#of()
javax.xml.bind.JAXBContext#createMarshaller() and other similar methods

Prototype（原型模式）

recognizeable by creational methods returning a different instance of itself with the same properties.

java.lang.Object#clone() (the class has to implement java.lang.Cloneable)

Singleton（单例模式）

recognizeable by creational methods returning the same instance (usually of itself) everytime.

java.lang.Runtime#getRuntime()
java.awt.Desktop#getDesktop()
java.lang.System#getSecurityManager()

Structural patterns（结构型模式）

Adapter（适配器模式）

recognizeable by creational methods taking an instance of different abstract/interface type and returning an implementation of own/another abstract/interface type which decorates/overrides the given instance.

java.util.Arrays#asList()
java.util.Collections#list()
java.util.Collections#enumeration()
java.io.InputStreamReader(InputStream) (returns a Reader)
java.io.OutputStreamWriter(OutputStream) (returns a Writer)
javax.xml.bind.annotation.adapters.XmlAdapter#marshal() and #unmarshal()

Bridge（桥接模式）

recognizeable by creational methods taking an instance of different abstract/interface type and returning an implementation of own abstract/interface type which delegates/uses the given instance.

None comes to mind yet. A fictive example would be new LinkedHashMap(LinkedHashSet, List) which returns an unmodifiable linked map which doesn’t clone the items, but uses them. The java.util.Collections#newSetFromMap() and singletonXXX() methods however comes close.

Composite（组合模式）

recognizeable by behavioral methods taking an instance of same abstract/interface type into a tree structure.

java.awt.Container#add(Component) (practically all over Swing thus)
javax.faces.component.UIComponent#getChildren() (practically all over JSF UI thus)

Decorator（装饰器模式）

recognizeable by creational methods taking an instance of same abstract/interface type which adds additional behaviour.

All subclasses of java.io.InputStream, OutputStream, Reader and Writer have a constructor taking an instance of same type.
java.util.Collections, the checkedXXX(), synchronizedXXX() and unmodifiableXXX() methods.
javax.servlet.http.HttpServletRequestWrapper and HttpServletResponseWrapper
javax.swing.JScrollPane

Facade（外观模式）

recognizeable by behavioral methods which internally uses instances of different independent abstract/interface types.

javax.faces.context.FacesContext, it internally uses among others the abstract/interface types LifeCycle, ViewHandler, NavigationHandler and many more without that the enduser has to worry about it (which are however overrideable by injection).
javax.faces.context.ExternalContext, which internally uses ServletContext, HttpSession, HttpServletRequest, HttpServletResponse, etc.

Flyweight（享元模式）

recognizeable by creational methods returning a cached instance, a bit the “multiton” idea.

java.lang.Integer#valueOf(int) (also on Boolean, Byte, Character, Short, Long and BigDecimal)

Proxy（代理模式）

recognizeable by creational methods which returns an implementation of given abstract/interface type which in turn delegates/uses a different implementation of given abstract/interface type.

java.lang.reflect.Proxy
java.rmi.*
javax.ejb.EJB (explanation here)
javax.inject.Inject (explanation here)
javax.persistence.PersistenceContext

Behavioral patterns（行为型模式）

Chain of responsibility（责任链模式）

recognizeable by behavioral methods which (indirectly) invokes the same method in another implementation of same abstract/interface type in a queue.

java.util.logging.Logger#log()
javax.servlet.Filter#doFilter()

Command（命令模式）

recognizeable by behavioral methods in an abstract/interface type which invokes a method in an implementation of a different abstract/interface type which has been encapsulated by the command implementation during its creation.

All implementations of java.lang.Runnable
All implementations of javax.swing.Action

Interpreter（解释器模式）

recognizeable by behavioral methods returning a structurally different instance/type of the given instance/type; note that parsing/formatting is not part of the pattern, determining the pattern and how to apply it is.

java.util.Pattern
java.text.Normalizer
All subclasses of java.text.Format
All subclasses of javax.el.ELResolver

Iterator（迭代器模式）

recognizeable by behavioral methods sequentially returning instances of a different type from a queue.

All implementations of java.util.Iterator (thus among others also java.util.Scanner!).
All implementations of java.util.Enumeration

Mediator（中介者模式）

recognizeable by behavioral methods taking an instance of different abstract/interface type (usually using the command pattern) which delegates/uses the given instance.

java.util.Timer (all scheduleXXX() methods)
java.util.concurrent.Executor#execute()
java.util.concurrent.ExecutorService (the invokeXXX() and submit() methods)
java.util.concurrent.ScheduledExecutorService (all scheduleXXX() methods)
java.lang.reflect.Method#invoke()

Memento（备忘录模式）

recognizeable by behavioral methods which internally changes the state of the whole instance.

java.util.Date (the setter methods do that, Date is internally represented by a long value)
All implementations of java.io.Serializable
All implementations of javax.faces.component.StateHolder

Observer(or Publish/Subscribe)（观察者模式）

recognizeable by behavioral methods which invokes a method on an instance of another abstract/interface type, depending on own state.

java.util.Observer/java.util.Observable (rarely used in real world though)
All implementations of java.util.EventListener (practically all over Swing thus)
javax.servlet.http.HttpSessionBindingListener
javax.servlet.http.HttpSessionAttributeListener
javax.faces.event.PhaseListener

State（状态模式）

recognizeable by behavioral methods which changes its behaviour depending on the instance’s state which can be controlled externally.

javax.faces.lifecycle.LifeCycle#execute() (controlled by FacesServlet, the behaviour is dependent on current phase (state) of JSF lifecycle)

Strategy（策略模式）

recognizeable by behavioral methods in an abstract/interface type which invokes a method in an implementation of a different abstract/interface type which has been passed-in as method argument into the strategy implementation.

java.util.Comparator#compare(), executed by among others Collections#sort().
javax.servlet.http.HttpServlet, the service() and all doXXX() methods take HttpServletRequest and HttpServletResponse and the implementor has to process them (and not to get hold of them as instance variables!).
javax.servlet.Filter#doFilter()

Template method（模板模式）

recognizeable by behavioral methods which already have a “default” behaviour defined by an abstract type.

All non-abstract methods of java.io.InputStream, java.io.OutputStream, java.io.Reader and java.io.Writer.
All non-abstract methods of java.util.AbstractList, java.util.AbstractSet and java.util.AbstractMap.
javax.servlet.http.HttpServlet, all the doXXX() methods by default sends a HTTP 405 “Method Not Allowed” error to the response. You’re free to implement none or any of them.

Visitor （访问者模式）

recognizeable by two different abstract/interface types which has methods defined which takes each the other abstract/interface type; the one actually calls the method of the other and the other executes the desired strategy on it.

javax.lang.model.element.AnnotationValue and AnnotationValueVisitor
javax.lang.model.element.Element and ElementVisitor
javax.lang.model.type.TypeMirror and TypeVisitor
java.nio.file.FileVisitor and SimpleFileVisitor
javax.faces.component.visit.VisitContext and VisitCallback

转载说明

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原文：原文链接

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