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How can a primitive datatype like array of integers have a field ‘length’, when it is not a class? e.g.
int a[] = {1,2,3,4};
int j = a.length;
System.out.println(j);
Simple: arrays are not primitives. Rather, they are objects of a reference type.
Another way to experience this is to see what happens if you pass an array of int into a method and modify the contents of the array from within the method. You’ll see that this will modify the original array object too, as would happen to all variables of reference type (non-primitive).