public static void printSnakeListToJavaVar(List<String> snakeList) {
for (String columnName : snakeList) {
columnName = columnName.trim();
System.out.println("@Column(name=\"" + columnName + "\")");
System.out.println("String " + snakeToJavaVar(columnName.toLowerCase()) + ";");
}

    }
 public static String snakeToJavaVar(String str) {
        // Capitalize first letter of string
        str = str.substring(0, 1).toLowerCase()
                + str.substring(1);

        // Run a loop till string
        return capitalizeFirstCharAfterDelimiter(str, "_");
}
private static String capitalizeFirstCharAfterDelimiter(String str, String deLimiter) {
        // string contains delimiter
        while (str.matches(".*" + deLimiter + ".*")) {

            str = str.replaceFirst(
                    deLimiter + "[a-z]",
                    String.valueOf(
                            Character.toUpperCase(
                                    str.charAt(
                                            str.indexOf(deLimiter) + 1))));
        }

        return str;
    }

public static String camelToSnake(String str) {
        String result = "";
        char c = str.charAt(0);
        result = result + Character.toLowerCase(c);
        for (int i = 1; i < str.length(); i++) {

            char ch = str.charAt(i);
            if (Character.isUpperCase(ch)) {
                result = result + '_';
                result
                        = result
                        + Character.toLowerCase(ch);
            }else {
                result = result + ch;
            }
        }

        return result;
    }

CaseConvertor.stringToUpperCamelIncludeDelimiter("12 DAYS"," ")
public static String stringToUpperCamelIncludeDelimiter(String str, String delimiter) {
        return Arrays.stream(str.toLowerCase().split(delimiter))
                .map(CaseConvertor::capitalize)
                .collect(Collectors.joining(delimiter));
    }

    public static String capitalize(String str) {
        if (str == null || str.length() <= 1) return str;
        return str.substring(0, 1).toUpperCase() + str.substring(1);
    }