Web Reference: Jan 14, 2026 · The only allowed characters for identifiers are all alphanumeric characters ( [A-Z], [a-z], [0-9]), '$' (dollar sign) and '_' (underscore). For example, "geek@" is not a valid Java identifier as it contains a '@', a special character. Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume). Note: It is recommended to use descriptive names in order to create understandable and maintainable code: A valid identifier in java – Following example shows various possible identifiers used to declare a variable in Java.
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