Initialization of Instance Variables in Java -

how instance variable id gets initialized 0 when have provided our own default constructor , did not initialize id in it? output comes id:0 status:b how id 0?

`class demo{     private int id;     private char status;       public demo(){      status = 'b';     }      public void display(){     system.out.println("id:="+id+" status:"+status);     }      public static void main(string args[]){     demo ob = new demo();     ob.display();     } }` 

below default intializations

the following chart summarizes default values above data types.

data type              |  default value (for fields) -----------------------+----------------------------- byte                   |   0 short                  |   0 int                    |   0 long                   |   0l float                  |   0.0f double                 |   0.0d char                   |   '\u0000' string (or object) |   null boolean                |   false