How Java converts numbers of char types to numbers of type int instead of ASCII

How to convert char ' 3 ' to int 3, you should know that you cannot convert directly, so get the ASCII of ' 3 '. As below:

 Public class leet {    publicstaticvoid  main (string[] args) {        char c = ' 5 ';         int i = C;        System.out.println (i);    }}

The result is an ASCII code:

So how exactly does it turn into the type of int data that's really going to be used, the simplest way, char type character minus ' 0 ' on it, directly on the code:

1  Public class leet {2      Public Static void Main (string[] args) {3         char c = ' 5 '; 4         int i = c-' 0 '; // minus ' 0 ' is the type of int data you want. 5         System.out.println (i); 6     }7 }

How Java Converts a number of type char to a number of type int, not ASCII