As a programmer, to master UML class diagram is the basis for developing and reading programs.
Reproduced please specify address http://www.cnblogs.com/zrtqsk/p/3739288.html, thank you!
First, the basic introduction
UML is a standard graphical modeling language. The class diagram shows, the relationship between them is a set of classes and interfaces cooperation. UML class diagram is a graphical representation of a static view of the way through it, the relationship between the programmer can understand more clearly the class and class system.
The basic model element class diagram is as follows:
We can see, a class diagram showing a rectangular, divided into three parts, the top is the name of the class, the middle class is a property, the following is the operation of the class.
Abstract classes and interfaces and class diagram is similar, the detailed explanations.
Second, the basic definitions
1, property
Figure:
Attribute represented by the above general format - <Access> <attribute name>: <attribute type> = <Initial value>
For Visibility: + indicates public, - represent private, # represents protected, no symbol indicates the default package access
(If only internal use a class attribute, generally referred to as Attribute. If provided corresponding get, set method, generally referred Property)
2, method
Figure:
The method described above is represented by the general format - <Access> <method name>: (<parameter 1>: <1 Parameter type>, <parameter 2>: <Parameter Type 2>): <return type>
Static methods are underlined.
Abstract method, the entire operations are shown in italics.
3, classes and interfaces
Abstract class 
interfaces 
,
Abstract classes and interfaces are in italics class name, the interface can also be represented by a circle.
Third, the relationship
1. Related
Association generally represented by a straight line.
1) Ordinary associate
- with an arrow indicates the direction of the association.
- numbers in the figures represent the number of weight
0..1 object represents 0 or 1
0 .. * denotes 0 or 0 to a plurality of objects
5..8 objects represents 5-8
2 shows two objects
No mark represents a target
2) recursive association
Represent a class of their own and have relationships.
3) aggregation association
It represents a class and class have a relationship, "and the integral portion" represents a whole by a hollow diamond.
4) Synthesis of the relationship (strong polymerization)
Represents part of the whole can not be divorced exist. An overall with a solid diamond.
2, generalization (inheritance)
By adding a solid line arrow indicates a hollow, one of the inherited point inherited side.
3, to achieve
Plus a broken line with hollow arrows, one pointing implement the interface.
4, dependence
Represented by a dotted arrow. That class Client uses RightDao and RightDaoImpl.
(Refer to part "Design polishing mode")
Reproduced in: https: //www.cnblogs.com/zrtqsk/p/3739288.html