Naming Java Identifiers - Variables, Methods, and Object Names - Java Tutorial - Appficial

An identifier is a name to represent a variable, object or method. Identifiers may contain letters (A-Z and a-z), digits (0-9), underscores (_) and dollar signs ($). Identifiers cannot start with a digit. It’s good practice to not use _ or $ when naming identifiers. Standard naming conventions (style) are to start your identifier with a lower case word, and capitalize the first letter of any other words (camel-case). Identifiers should be meaningful and self-documenting

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