Consider$$the$$following$$UML$$and$$the$$corresponding$$suggested$$implementation$.$

Find$$all$$the$$coupling$$between$$classes;$$make$$sure$$to$$identify$$the$$type$$of$$the$$coupling$.$

Redesign$$the$$model$$in$$order$$to$$decrease$$the$$coupling$$as$$much$$as$$possible$.$

$\backslash$table$[[$Controller$],[-$db:$$DB$],[+$create$($string$$id$,$int$)$:$$void$]]$

public$$create$($string$$id$,$int$)$

$\{$

account$$ac$=$new$$account$($id$)$;

db$.$add$($ac$,$;

$\}$

$\backslash$table$[[$DB$],[+$add$($account$,$int$)$:$$void$],[+$connect$()$:$$void$],[+$disconnect$()$:$$void$],[]]$

public$$add$($account$,$int$)$

$\{$

if