java - How to work with non generic lists -


i have work older interface specifying methods bare list parameter.

void updateparameter(list param1, list param2);

obviously need implement them same signature.

@override public void updateparameter(list param1, list param2) {     updateparam1( param1 );     updateparam2( param2 ); }

but new code? should keep working these old lists. should new method's signature take generic lists?

private void updateparam1( list<string> param1 ) { ... }

should explicitly convert/cast them?

what best practices here?

i stick philosophy of "don't let defects passed down stream". somewhere, unsafe type cast must happen (even if done under hood compiler). why not possible? way code downstream can clean , have problem in 1 place instead of scattered throughout code base. follows principle of "fail fast".

@override public void updateparameter(list param1, list param2) {    list<string> param1typesafe = (list<string>)param1;   list<string> param2typesafe = (list<string>)param2;   updateparam1( param1typesafe );   updateparam2( param2typesafe );   //now else in codebase needs deal it. }

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