public class Design {
     String cellSize(int sizeOfTable) {
        if(sizeOfTable < 4) {
            return "-";
        } else if(sizeOfTable < 10) {
            return "--";
        } else if(sizeOfTable < 31) {
            return "---";
        } else {
            return "----";
        }
    }

     String sizeOfSpace(int lengthOfNumber, String cellSize) {
        switch (cellSize) {
            case "-":
                return "";
            case "--":
                return getWhiteSpaces(lengthOfNumber, 2);
            case "---":
                return getWhiteSpaces(lengthOfNumber, 3);

            case "----":
                return getWhiteSpaces(lengthOfNumber, 4);

        }
        return "";
    }

    private String getWhiteSpaces(int lenghtOfNumber, int count) {
        String result = "";

        for ( ; count != lenghtOfNumber; lenghtOfNumber++) {
            result += " ";
        }
        return result;
    }
}