java pattern class

Java Design Pattern cainiao series (4) Factory method pattern modeling and implementation Factory Method) Factory method: As the name implies, it is to call methods in the factory to produce objects (products.There are three ways to implement the factory method: I. general factory Model. Is to create a factory class a

Java design pattern-compound Pattern 2Next, the duck Ming example: Java design pattern-one of the composite patternIn the above article, we have implemented the combination of the modifier mode adapter mode factory mode, and now we need to make changes. above, we can count t

class: package Flyweight;public class ConcreteFlyweight extends Flyweight{　private String string;　public ConcreteFlyweight(String str){　　string = str;　}　public void operation()　{　　System.out.println("Concrete---Flyweight : " + string);　}} Implement a factory method class: Package Flyweight; import java. util. hashtabl

context class and passes the environment context object as a construction parameter of the subclass state to the specific state subclass instance.As in the Context.java class:Set initial state this.state = new Concretestatea (this);2> in the specific subclass state class, according to the context object constructed, the business logic judgment is checked and switched by invoking the property value of the c

();Notifyobservers (state); } @Override public void Notifyobservers () {super.notifyobservers ();}}======================================Package com.bjsxt.cn.observer2;Import Java.util.observable;import java.util.Observer;public class Observera implements Observer {private int state; public int getState () {return state;}public void SetState (int.) {this.state = state;}@Override public void Update (Observable arg0, Object arg1) {setState (((ConcreteS

definition: encapsulates operations that act on elements of a data structure, and it can define new operations that function on these elements without altering the data structure.Type: behavior class patternclass Diagram: Example:For example, consider a shopping cart that adds different types of merchandise, and when clicked, it calculates the cost of all the different items. Now, the computational logic is to calculate the price of these different

The 19th chapter of the design pattern-the mediator pattern (Java implementation)　　"The Test girl paper for you, your code problem." "The artist paper lets you see how the interface is." "As programmers always have to deal with a variety of people, but if divided into front-end, back-end engineers, then the relationship will be complicated, this time if there are

Java Design Pattern Template Method (template Method), design pattern Template This article continues to introduce the template method modes of the 23 design patterns series. Overview The template method mode is the behavior mode of the class. Prepare an abstract class, impl

Java and design pattern: responsibility chain pattern The responsibility chain model is one of the behavioral design patterns. How can we understand the responsibility chain? A responsibility chain is formed by connecting the beginning and end of several objects. Each node is an object, and each object corresponds to different processing logic until an object res

Java Design Pattern -- Abstract factory pattern (Abstract factory) Abstract Factory mode can provide interfaces to customers so that the client can create product objects in multiple product families without specifying the specific product type.System DesignThe system class diagram designed using the abstract factory m

Java Design Pattern modeling and implementation of cainiao series (9) Appearance Pattern Facade: Solves the dependency between classes. Like spring, you can configure the relationship between classes to the configuration file, the appearance mode is The relationship is placed in a Facade class, which reduces the coupl

　　The Observer pattern defines a one-to-many dependency that allows multiple observer objects to listen to a Subject object at the same time. When the subject object changes in state, all observer objects are notified so that they can automatically update themselves.The main point here is to learn the records of the built-in observers, which in the Java language's Java.util library provides a observable

encounter one-to-one or multiple-to-one situations. One-to-one means that a target corresponds to an observer. Multiple-to-one means that multiple targets correspond to one observer. Class diagram: Instance 1 In this example, a teacher has a phone number and students need to know the phone number of the teacher so that they can call the phone number when appropriate. In this combination, the teacher is a Subject, and the student is the observer who

AbstractClass { + - @Override + Public voidPrimitiveOperation1 () { ASystem. out. println ("Concrete Class B Method 1 Implementation"); at - } - - @Override - Public voidPrimitiveOperation2 () { -System. out. println ("Concrete Class B Method 2 implementation"); in - } to +}Test class:1 Package Cn.happy.design_pattern._07templatemethod;2 3

The example of this article for everyone to share the Java strategy model for your reference, the specific contents are as follows 1, the Strategic model (strategy pattern) is a relatively simple model, also known as the Policy Model (Policypattern).The definition is as follows: Define a family of algorithms,encapsulate each one,and make them interchangeable.(defines a set of algorithms that encapsulate e

[Android Java] design pattern code: Observer Pattern The observer is like a person who is interested in many things, like music, electronic products, games, and stocks. Changes in these things can attract the attention of fans and always pay attention to them. In the code, we also have such a way to design some interesting ideas. Today, I will write a Demo to de

Java Design Pattern modeling and implementation of cainiao series (22) intermediary Pattern Mediator: it is mainly used to reduce the coupling between classes, because if there is a dependency between classes, it is not conducive to function expansion and maintenance, because only one object needs to be modified, other associated objects must be modified.I. uml

Java Design Pattern cainiao series (10) template method pattern modeling and implementation Template Method: defines the skeleton of an algorithm in a Method, and delays some steps to the subclass. The template method allows the subclass to redefine some steps in the algorithm without changing the algorithm structure. In short, the template method defines an al

Java Design Pattern serialization (2) -- abstract factory pattern Intent: Provides an interface for creating a series of related or mutually dependent objects without specifying their specific classes. Applicability: A system must be independent of the creation, combination, and representation of its products. A system must be configured by one of multiple