java design patterns pdf

In the book "Java and Patterns" of Dr. Shanhong, this describes the factory method pattern:The factory method pattern is the creation mode of the class, also known as the virtual Constructor mode or the Polymorphism factory (polymorphic Factory) pattern.The factory method pattern is intended to define a factory interface that creates product objects, deferring actual creation to subclasses.Then the factory

. Template method Mode Defines the skeleton of an algorithm in an operation, and delays some steps into subclasses. Templatemethod allows subclasses to redefine some specific steps of the algorithm without altering the structure of an algorithm. Visitor mode Represents an operation that acts on each element in an object structure. It allows you to define new actions that act on these elements without changing the class of each element. If many

responsibilitypattern★★★☆☆★★☆☆☆Behavioral Mode Behavioral Pattern command pattern★★★☆☆★★★★☆Behavioral pattern Behavioral Pattern Interpreter mode interpreter pattern★★★★★★☆☆☆☆Behavioral pattern Behavioral Pattern iterator mode Iterator pattern★★★☆☆★★★★★Behavioral pattern Behavioral Pattern Mediator mode Mediator pattern★★★☆☆★★☆☆☆Behavioral Pattern Behavioral Pattern Memo mode Memento pattern★★☆☆☆★★☆☆☆Behavioral patterns Behavioral Pattern observer

() method that called them is passed in this and arg as parameters */Publ IC void Notifyobservers (Object arg) {object[] arrlocal; Synchronized (this) {if (!changed) return; arrlocal = Obs.toarray (); Clearchanged (); } for (int i = arrlocal.length-1; i>=0; i--)((Observer) arrlocal[i]). Update (this, ARG); }/** * Will gather the observers to empty */public synchronized void Deleteobservers () {obs.removeallelements (); }/** * Set "changed" to Tru

), using iterators to traverse simple fission rather cumbersome, large as a list, we prefer to use the Foreach loop to traverse. 　　11, Interpreter mode (interpreter pattern)-this pattern is the rule that defines the language, and an interpreter is created to explain the semantics of the rule. If a particular type of problem occurs at a sufficiently high frequency, it is worthwhile to describe each instance of the problem as a sentence in a simple language, and you will naturally need to construc

the Showflight class into the Plotpanel class and use the function object instead to get the x and Y values. Defines the number of points required for a Plotpanel constructor to receive two function instances and drawings. Class diagram Design,The Main method is still written in Showflight, but we name it ShowFlight2. The function class is used to obtain the corresponding x and Y coordinate values. However, because the specific x and Y are a val

advocated by effective, the Java author, Josh Bloch.SummarizeThere are several uses of the singleton pattern, so let's summarize what we need to pay attention to using the singleton pattern (not including enumerations). Construction method Privatization (private); Defines a private (private) static instantiation object; Provides a public static (static) method to obtain this instance; Original is not easy, if feel good, hope to

I have been reading the Junit Source Code recently, and I have also read many source code analyses of Junit. I have seen the Java design mode, Command mode, Observer mode, Composite mode, and so on. I used to know that there was a Java design pattern. This time I checked the Junit source code and found that this

Design pattern (Patterns) --the foundation of reusable object-oriented software Design patterns are a set of repeated use, most people know, through the classification of purpose, code design experience Summary. Design

I. Classification of design PatternsIn general, design patterns fall into three broad categories:Create five types of models: Factory method mode, abstract Factory mode, singleton mode, builder mode, prototype mode.Structure mode, a total of seven kinds: Adapter mode, adorner mode, proxy mode, appearance mode, bridging mode, combined mode, enjoy the meta-mode.Beh

(Chinese translation: Design Patterns-Reusable object-oriented software elements) mentioned in a total of 23 Design patterns. These patterns can be categorized into three main categories: the creation pattern (creational Patterns

,Suppose you need to use Swing's user interface to display several rockets in the table. As shown, the Rockettablemodel class can be created to match this set of rockets to the interface expected by TableModel.The reason we use the object adapter pattern here is because the abstract class provides some of the implementation that the adapter needs, and the interface that the client expects, then we inherit from the abstract class instead of implementing the interface, and the adapter object has m