20170908 working days--UML Drawing Class diagram, HTTP protocol, volley source day

After a bit of searching, Android Studio can automatically help us to generate UML class diagram, simply fantastic Http://www.gcssloop.com/course/UsePlantUMLInAS (Win), the specific approach to the blog address. The test is not based on the Java file automatically generated, but need to write their own dot syntax related code, such as, then give up

1.UML Plotting class diagram

Use the online site https://www.processon.com/for class diagram drawing. Master the basic drawing, such as interface implementation, inheritance relationship and so on.

A few relationships between classes:

1. Generalization--inheritance relationship of subclasses and parent classes

2. Implementation--class-to-interface relationships, which indicate that a class is an interface's behavior implementation

3. Aggregation-the relationship between the whole and the part, can be separated from the overall existence . For example: Cars and tires, tires are part of a car, but tyres can exist alone

4. Combination-is the relationship between the whole and the part, part cannot be separated from the whole existence . For example: Face and lips, lips can not be separated from the face and exist alone.

Summary: The order of strength and weakness of the relationships is as follows:

Refer to the blog http://www.360doc.com/content/13/0304/13/10504424_269223190.shtml, the classification is relatively clear

2. User-agent Information for HTTP

When a request is made using the HTTP protocol, the HTTP protocol header adds User-agent, which can identify some information about the requestor, such as what browser type and version, operating system, language, and so on. For example: through the packet analysis, learned that Ie,firefox, proud to swim in several browsers user-agent information is "mozilla/..." beginning

20170908 working days--UML Drawing Class diagram, HTTP protocol, volley source day