String、Date、LocalDateの変換

String を java.time.LocalDate に変換

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static final private String DATE_FORMAT = "yyyy-MM-dd";

public static LocalDate string2LocalDate(final String date) {
  return LocalDate.parse(date, DateTimeFormatter.ofPattern(DATE_FORMAT));
}

java.util.Date を java.time.LocalDate に変換

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public static LocalDate date2LocalDate(final Date date) {
  return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
}

java.time.LocalDate を java.util.Date に変換

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public static Date localDate2Date(final LocalDate localDate) {
  return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
}