DateUtils { public static String getNextWeekCode(String weekCode) { if (weekCode == null) { return null; } int year = getYearFromWeekCode(weekCode); int week = getWeekFromWeekCode(weekCode); String next = year + "-" + StringUtils.leftPad(Integer.toString(week + 1), 2, "0"); if (isValidWeekCode(next)) { return next; } else { return (year + 1) + "-" + "01"; } } private  DateUtils(); @SuppressWarnings("unchecked") static T createJava8Date(Class<T> clazz, String dateStr, String format); static LocalDate createLocalDate(String dateStr); static LocalDate createLocalDate(String dateStr, String format); static LocalDateTime createLocalDateTime(String dateTimeStr); static LocalDateTime createLocalDateTime(String dateTimeStr, String format); static LocalTime createLocalTime(String timeStr); static LocalTime createLocalTime(String timeStr, String format); static ZonedDateTime createZonedDateTime(String dateTimeStr); static ZonedDateTime createZonedDateTime(String dateTimeStr, String format); static String formatDate(LocalDate date, String format); static String formatDateTime(LocalDateTime dateTime, String format); static String formatJava8Date(Class<?> clazz, Object value, String format); static String formatTime(LocalTime time, String format); static String formatZonedDateTime(ZonedDateTime dateTime, String format); static int getLastWeekOfYear(int year); static String getNextWeekCode(String weekCode); static int getQuarter(LocalDate date); static LocalDate getStartDateOfWeek(String weekCode); static boolean isJava8DateType(Class<?> clazz); static boolean isSupportedDateType(Class<?> clazz); static boolean isValidWeekCode(String weekCode); static Date toLegacyDate(LocalDate d); static Date toLegacyDate(LocalDateTime ldt); static String toWeekCode(LocalDate date); static final String WEEK_CODE_PATTERN; }
@Test public void testGetNextWeekCode() { assertEquals("2015-02", DateUtils.getNextWeekCode("2015-01")); assertEquals("2015-03", DateUtils.getNextWeekCode("2015-02")); assertEquals("2015-53", DateUtils.getNextWeekCode("2015-52")); assertEquals("2016-01", DateUtils.getNextWeekCode("2015-53")); assertEquals("2017-01", DateUtils.getNextWeekCode("2016-52")); }