why use array.length instead of the size as an int code example

Example 1: find length of array java

Int[] array = {1,2,3};
int lengthOfArray = array.length; /** Finding the length of the array and storing it */
System.out.println(String.valueOf(lengthOfArray)); /** Should print out 3, String.value Of() is optional as printLn does this automatically. */

Example 2: length of array in java

arr.length;