What are the naming rules for variables in java

The naming rules for variables in Java are: 1. It must start with a letter, underscore, or dollar sign; 2. The variable name must be composed of letters, numbers, and underscores; 3. The variable name cannot conflict with the java keyword .

Some rules for naming variables:

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1. It must start with a letter, an underscore, or the dollar sign $;

Variables named starting with the dollar sign$ can be compiled but are not recommended;

Chinese names can also be used as the beginning and The compilation can also pass, but its use is not recommended.

2. Except for the beginning, the following part can be composed of letters, underscores, dollar signs $, and numbers;

3. Although the length of the variable name is not limited, it can express the meaning of the name clearly. Yes;

4. Variable names cannot conflict with java keywords;

5. There is a difference between upper and lower case in renaming, even if it is named by the same word but there are individual letters The difference between upper and lower case results in two different variables.

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