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List<String> list = Arrays.asList("", "a1", "a2", "b1", "c2", "c1");
         
         
List<String> newList = list.stream()
                                         .sorted((a, b) -> a.compareTo(b))
                                         .map( x -> x.startsWith("c") ? x.toUpperCase() : x )                                    
                                        .collect(Collectors.toList());