What are the naming rules for java identifiers?

Java identifier naming rules are: 1. It must be composed of letters, numbers, underscores and dollar signs; 2. It cannot start with a number; 3. It cannot conflict with keywords; 4. It cannot conflict with the java class library Class name conflict; 5. Meaningful names should be used.

Naming rules:

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identifier is used as Name variables, classes, and methods

Identifiers must consist of uppercase and lowercase letters, numbers, underscores (_), and dollar signs ($), but cannot begin with a number.

Case sensitive

Cannot have the same name as the Java language keyword

Cannot have the same name as the class name of the Java class library

Cannot have spaces, @, #, , -, / and other symbols

There is no limit to the length

Should use meaningful names to achieve the purpose of knowing the meaning

cannot be true and false

Common naming conventions:

Package name: use lowercase letters.

Class names and interface names: usually defined as consisting of words with meaning, with the first letter of all words capitalized.

Method name: It is usually composed of words with meaning. The first letter of the first word is lowercase, and the first letter of other words is capitalized.

Variable names: Member variables are the same as methods, and local variables are all lowercase.

Constant names: Use all uppercase letters, and it is best to use underscores to separate words.

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