Java Data Type - 如何解析和格式日期

import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
  public static void main(String[] args) {
    LocalDate date = LocalDate.now();
    // default format
    System.out.println("Default format of LocalDate=" + date);
    // specific format
    System.out.println(date.format(DateTimeFormatter
        .ofPattern("d::MMM::uuuu")));
    System.out.println(date.format(DateTimeFormatter.BASIC_ISO_DATE));

    LocalDateTime dateTime = LocalDateTime.now();
    // default format
    System.out.println("Default format of LocalDateTime=" + dateTime);
    // specific format
    System.out.println(dateTime.format(DateTimeFormatter
        .ofPattern("d::MMM::uuuu HH::mm::ss")));
    System.out.println(dateTime.format(DateTimeFormatter.BASIC_ISO_DATE));

    Instant timestamp = Instant.now();
    // default format
    System.out.println("Default format of Instant=" + timestamp);

    // Parse examples
    LocalDateTime dt = LocalDateTime.parse("27::Apr::2014 21::39::48",
        DateTimeFormatter.ofPattern("d::MMM::uuuu HH::mm::ss"));
    System.out.println("Default format after parsing = " + dt);
  }
}