Java how to sort lowercase before uppercase strings

Question

I want the files to be ordered by their abs path name, but I want the lowercase to be sorted before the uppercase. Example: Let\'s say I got 4 files:

files2.         


        

Answer 1

Try this simple implementation :

public static void main(String[] args) {
            List list = new ArrayList();
            list.add("a");
            list.add("b");
            list.add("A");
            list.add("B");
            System.out.println(list);
            Collections.sort(list, new Comparator() {
                    @Override
                    public int compare(String o1, String o2) {
                            if (o1.toLowerCase().equals(o2.toLowerCase())) {
                                    if (o1.toLowerCase().equals(o1)) {
                                            return -1;
                                    } else {
                                            return  1;
                                    }
                            } else {
                                    return o1.toLowerCase().compareTo(o2.toLowerCase());

                            }
                    }
            });
            System.out.println(list);
    }