List <Integer> list = ...; int[] array = new int[list.size()]; for(int i = 0; i < list.size(); i++) ... ... <看更多>

Up to this point we have stored data exclusively in variables. Variables are fantastic for storing a single value ... ... <看更多>

I'd use guard clauses to check whether the list parameter is null or not. Furthermore, the list.size() > 0 check looks unnecessary in the ... ... <看更多>