Where is array's length property defined?

Question

We can determine the length of an ArrayList using its public method size(), like

ArrayList arr = new ArrayL         


        

Answer 1

The keyword length acts like a data filed defined. When using in an array, we can use it to access how many elements in an array. Regarding to String[], we can invoke length() method defined in String class. With regard to ArrayList, we can use size() method defined in ArrayList. Note that when creating an array list with ArrayList<>(capacity), the initial size() of this array list is zero since there is no element.