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be differentiated from the semantic level;
The aggregation relationship is also implemented using instance variables. There is no association or aggregation from the Java syntax.
Combinatorial (composition) relationship (composition): Also a special case of association, he embodies a kind of contains-a relationship, which is stronger than aggregation, also known as strong aggregation; he also embodies the relationship between the whole and the parts
capability. In Java (Figure E) To an instance scope variable, as shown in the code in the "Java" Area in Figure E. You can append other modifiers to an association. The Multiplicity modifier implies the relationship between instances. In the Demo code, the Employee can have 0 or more TimeCard objects. However, each TimeCard only belongs to a single Employee.
Figure E
Aggregation)
Aggregate (Figure FIs a
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Object-oriented modelObject-oriented model is a model that uses UML (Unified Modeling Language) to describe the system structure, and it realizes the working state of the system from different angles. These graphs facilitate information exchange between users, managers, system analysts, developers, testers, and other personnel. This article mainly introduces use case diagram, Sequence
Object-oriented model
Object-oriented model is a model that uses UML (Unified Modeling Language) to describe the system structure, which realizes the working state of the system from different angles. These graphics help communicate information between users, managers, system analysts, developers, testers, and others. This article mainly introduces use case diagram, Sequence
commodity to a product that has an added class, registering a user registration class, and so on.
(3) boundary class : The boundary class is used to abstract the interaction objects between the external user and the system, including the interface classes, such as dialog boxes, windows, menus, etc.
In the early stages of object-oriented analysis and design, it is common to identify entity classes first, and to draw initial class diagrams, where class diagrams can also be called domain models, i
one), "0 ..." (representing 0 or more), "0,1" (for 0 or one), "N...M" (for N to M), "m...*" (for at least m).• Association Relationship (association) is the most commonly used relationship between classes and classes, which is a structured relationship between a class of objects and another class of objects. • In UML class diagrams, objects that are associated with a solid line are connected by a class that, when implemented in a programming language
-01This article was synchronized on: http://blog.csdn.net/sfdev/archive/2009/02/18/3906243.aspxThis is a tutorial on the basics of UML; now that we're doing a project too tight, we haven't really done a real class-level detail design, let alone using UML to implement canonical modeling; This article is mainly about the relationship between several classes that I have been confused about before, Let's make i
PHP and UML class diagrams PHPandUMLClassDiagrams. This short article is well written. it can be said that using PHP to explain UML (or conversely) is an innovation. through this article, I also found a good site: www.phppatterns.com. This short article on various UML techniques is well written. using PHP to explain UML
UML modeling, it is important to understand the elements that appear on the class diagram. The developer must understand how to convert the elements appearing on the class diagram into Java. With Java as the representative of some examples of the Internet, here are some bas
This short article is well written. it can be said that using PHP to explain UML (or conversely) is an innovation. through this article, I also found a good site: www.phppatterns.com. The translation of various UML terms comes from the book I am reading, TheUnifiedModelingLanguageUserGuide. UML (UnifiedModelingLanguage) is a good short article. using PHP to expla
This essay is good, the use of PHP to explain the UML (or conversely) can be said to be an innovation, through this article, I also found a good station: www.phppatterns.com. The translation of the UML terms comes from the Unified Modeling Language User Guide, which I am looking at. UML (Unified Modeling Language, Unified Modeling Language) is a mechanism for rep
, generalization (generalization):is a class (called a subclass, sub-interface) that inherits the functionality of another class (called a parent, parent interface) and can augment its own new functionality, which is the most common relationship between classes and classes or interfaces and interfaces, and in Java such relationships are explicitly identified by the keyword extends. Represented by an implementation with a hollow arrow. "Other relations
In software systems, classes do not exist in isolation, there are various relationships between classes and classes, and UML provides different representations for different types of relationships.1. Related relationshipsAn Association (association) relationship is the most common relationship between a class and a class, and it is a structured relationship that is used to indicate that a class of objects is associated with another type of object, suc
repetition, there is a list in a, which holds the B object's n references , that's it.Well, to here, already put the above diagram of the relationship is finished, I hope you can have some gains, I also spent a lot of time ah (drawing, generate code, write to the blog, alas, a sweat). But it's worth it if you can get a thorough understanding of these relationships in UML class diagrams. :)+++++++++++++++++
inheritance relationships between classes and interfaces. Figure H
650) This. width = 650; "src =" http://pic002.cnblogs.com/images/2012/285763/2012061315050938.gif "style =" margin: 0px; padding: 0px; Border: 0px; "/>
1.1.6 implementation (realization): Expressed by hollow arrows and dotted lines
Instance (FigureI) Link specifies a contract between two entities. In other words, one entity defines a contract, and the other entity guarantees the performance of the contract. When modeling
circumstances of the association, also embodies the part of the whole relationship, is a strong "ownership relationship", the whole and part have the same life cycle, is a strong association;Generalized Relationships (generalization and implementation): represents an inheritance relationship between a class and a class, an inheritance relationship between an interface and an interface, or a class-to-interface implementation relationship. A generalized relationship is a subclass that points to a
convert elements on the class diagram to Java. Java is used as a representative to combine some online instances. Below are some basic collection and summary of the individual: basic element Symbol: 1. Class (classes) class contains three components. The first is the class name defined in Java. The second is attribute
Teach () {
......
}
}
4. Interface and Implementation relationshipIn many object-oriented languages have introduced the concept of interfaces, such as Java, C #, etc., in the interface, usually no attributes, and all operations are abstract, only the operation of the Declaration, there is no implementation of the operation. UML represents an interface in a manner similar to the representation of a c
Relationship between classes (1)In a software system, classes do not exist independently. Classes and classes have various relationships. for different types of relationships, UML provides different representations.1. AssociationAssociation is the most common relationship between a class and a class. It is a structured relationship used to indicate the relationship between a Class Object and another class object, such as cars and tires, masters and ap
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