java pattern class

In the book "Java and Patterns" of Dr. Shanhong, this describes the template method pattern:　　The template method pattern is the behavior pattern of the class. Prepare an abstract class, implement some of the logic in the form of

Talking about the JAVA Design Pattern -- FactoryMethod and java factory patternReprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/45440937I. Overview Defines an interface used to create objects, so that the subclass determines which class to instantiate. FactoryMethod delays the inst

Observer pattern, Observer pattern class diagram Observer Mode

Java Design Pattern principle and java Design Pattern Principle 1,Identify the potential changes in the application and separate them from those that do not need to be changed. In other words, if every new requirement changes some code, you can determine that this part of code needs to be extracted to distinguish it

Memorandum mode of Java design pattern; Memorandum of java Design PatternThis article continues with the memorandum model of the 23 design patterns series.During programming, we often need to save the intermediate state of the object. When needed, we can restore to this state. For example, when we use Eclipse for programming, we want to return the status before t

Java Design Pattern learning, java Design Pattern Proxy) In fact, the name of each mode indicates the role of this mode. The proxy mode is to add one more proxy class to perform some operations for the original object. For example, we go back to the intermediary when renti

); Subjectfor3d.setmsg ("20140420 of the 3D number is: 127"); Subjectfor3d.setmsg ("20140421 3D number is: 333"); } Output results: Observer1 get 3D number-->20140420 3D number is: 127, I want to write down. Observer2 Get the 3D number-->20140420 3D number is: 127 I want to tell the roommate. Observer1 get 3D number-->20140421 3D number is: 333, I want to write down. Observer2 Get the 3D number-->20140421 3D number is: 333 I want to tell the roommate.

Definition: provides a way to access the elements of a container object without exposing the internal details of that object.Type: behavior class patternclass Diagram: If you want to ask one of the most used patterns in Java, the answer is not a single pattern, not a factory pattern, not a policy model, but an itera

The source code is JDK1.8 as reference1. Definition:Defines the framework for an algorithm in an operation, and delays some steps into subclasses. Enables subclasses to redefine some specific steps of the algorithm without changing the mechanism of an algorithm.2. Analysis:General class Diagram:class Diagram parsing:The template method pattern is very simple and only uses the

Java design pattern (1) simple factory pattern is not simpleSimple factory Use Cases There is an abstract product-Car, and there are a variety of specific sub-products, such as BenzCar, BMWCar, and LandRoverCar. The class diagram is as follows: As a driver, if you want to drive one of them, such as BenzCar, the most di

Intent The intent of a Null Object is to encapsulate the absence of an object by providing a substitutable alternative that offers suitable default do nothing behavior. In short, a design where "nothing will come of nothing" Use the Null Object pattern when An object requires a collaborator. The Null Object pattern does not introduce this collaboration-it makes use of a collaboration that already exists