[자바] 영문 대소문자 정렬

String x = "dBcAaEC";
        String[] arr = new String[x.length()];
        String[] arr2 = new String[x.length()];
        for (int i = 0; i < x.length(); i++) {
            arr[i] = x.substring(i, i + 1);
            arr2[i] = x.substring(i, i + 1);
        }
        char[] ch = x.toCharArray();
 
        Arrays.sort(arr, new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                if(o1.equalsIgnoreCase(o2)){
                    if(o1.toLowerCase().equals(o1)){
                        return -1;
                    }else{
                        return 1;
                    }
                }else {
                    return o1.compareToIgnoreCase(o2);
                }
 
            }
        });
 
        for (String item : arr) {
            System.out.print(item);
        }

대문자 후 소문자 식으로 정렬

Arrays.sort(arr2, new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                if(o1.equalsIgnoreCase(o2)){
                    if(o1.toUpperCase().equals(o1)){
                        return -1;
                    }else{
                        return 1;
                    }
                }else {
                    return o1.compareToIgnoreCase(o2);
                }
 
            }
        });
 
        for (String item : arr2) {
            System.out.print(item);
        }