A little theoretical confusion

Question

java has a string function named length() calculating length of string but what is length in array.length?an object or datatype?

Answer 1

array.length is class member constant of array and its datatype is int,

int[] a = {1,2,3,4,5};
byte len = a.length; // error: lossy conversion from int to byte

array itself internally is object

Answer 2

~ swim ~ does that read-only property have any specific name?