java - Notation " Class<?>... " -

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i have work existing code, , didnt find notation meant : class<?>...

for instance, used in method :

public static <t> hashset<constraintviolation<t>> validate(validator validator, t resource, class<?>... groups) {     return (hashset<constraintviolation<t>>) validator.validate(resource, groups); }

and called :

hashset<constraintviolation<entrydto>> l = validationtools.validate(this.validator, entrydto);

does mean "groups" optionnal ? found interesting topic : what class<?> mean in java? doesnt answer question...

thanks answers =)

the first answer have linked correctly tells class<?> means. ... called varargs, , means 0 or more arguments. argument class<?>... means number of arguments of type of class.

for more info on varargs, see https://docs.oracle.com/javase/1.5.0/docs/guide/language/varargs.html


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