String (java.util.List<String> list) { StringBuilder <warning descr="Contents of 'StringBuilder sb' are updated, but never queried">sb</warning> = new StringBuilder(); for (String s : list) { if (s != null) { if(sb.length() > 0) { assert sb.length() > 5; } sb.append(sb.length() > 0 ? ',' : "start"); sb.append(s.length()); } } return null; }