Java Code Conventions: must match pattern '^[a-z][a-zA-Z0-9]*$'

Question

i would like to use the following constant:

final String ADD = "Add text";

But my CheckStyle tool tells me that 'ADD' does not match the pattern '^[a-z][a-zA-Z0-9]*$'.

Could anyone please tell me what is wrong with 'ADD'? Means '^[a-z][a-zA-Z0-9]*$' that every name has to start with a low character? Is there no other possibility?

Thanks for answers.

Answer 1

^[a-z][a-zA-Z0-9]*$

This regex describes something which starts with lowercase and the remainder is composed of uppercase, lowercase, and numbers. (Examples: aVariable, variable, aNewVariable, variable7, aNewVariable7.)

If you want your field to be constant and static, use:

static final String ADD = "Add text";

Otherwise, use:

final String add = "Add text";

Answer 2

If it is a constant you want, it should also be static

static final String ADD = "Add text";

Constants normally use uppercase letters, but since your variable was not static, it was not interpreted as a constant.

Answer 3

This Regex indicate the need for camelCase with the first letter being small and then every next word having the first letter in it as capital letter.