Enthuware

dear sir

which i understand that if it is ( | )that mean when run programes will chek both condition and one of them is true will run null pointer exception

and when it is (||) will check first condition if is false then will chek the other condition if is true will run null pointer exception , and if it is true will not chek other condition and in this case will not read other condition and that cause programe never run null pointer exception

I am not sure I understand completely what you've written but I think yes, you got it.
-Paul.