Java basic-identifiers and naming conventions, and java basic identifiers

Java basic-identifiers and naming conventions, and java basic identifiers

Anything that can be named by yourself is called a modifier.

Example: Project name, package name, class name, Method Name

2.Naming rules.

① Java keywords and reserved words cannot be used, but they can contain keywords and reserved words.

② 26 uppercase/lowercase letters, numbers 0-9, $, and _.

③ Numbers can be used, but cannot be placed first.

④ There is no limit on the length theoretically, but it is best to reflect the effect of the name, follow the "Hump form", see life and wisdom.

Example: Write an ajax project instance,

Project name: ajaxtest

Package name: com. liu. ajax

Class Name: AjaxDemo

3.Usage and specifications of annotations.

In Java development, there are three types of Annotations:

① Single line comment:

// This is a single row commentaries

② Multi-line comment:

/* This is a multi-line comment, used outside the method, prompting the use of the method */

Public void show (){

Code block

}

③ Document notes:

/**

* Document comment

* Author

* Last modification time

*/

When using Eclipse for development, You can automatically generate a template for annotation. The setting steps are as follows:

Windows-Preferences-Java-Code Style-Code Template-Code

　　　　

Notes:

Class Annotation

/**

* FileName: Test. java

* @ Author class creator name
* @ Date creation Date

**/

② Attribute Annotation

/** Attribute function */

Private String afgsd = null

③ Method Annotation

/**

* @ Param parameter 1 Description of parameter 1

* @ Return description of returned results

* @ Throws exception type. The error code indicates the exception thrown from this class method.

*/