Cannot use ArrayList of type char as method's argument

Question

Cannot define ArrayList<char> as argument of validate. Why it cannot be done? When trying ArrayList<?> it works. Why? Should ArrayList<?> be used instead of ArrayList<char>? What is the difference?

public boolean validate(ArrayList<char> args){ ... }

Error: Syntax error on token "char", Dimensions expected after this token

Answer 1

public boolean validate(List<Character> args){ ... }

It has to be the wrapper type - Character - List<Character>. You can't use generics with primitive types.