package util; public class StringUtils { public static String defaultString(String value) { return defaultString(value, ""); } public static String defaultString(String value, String defaultValue) { return value == null ? defaultValue : value; } public static String addPostfix(String value, String postfix) { return isEmpty(value) ? "" : value + postfix; } public static boolean isEmpty(String value) { return value == null || "".equals(value); } public static boolean isNotEmpty(String value) { return !isEmpty(value); } }