将日期转换为瞬间，反之亦然

import java.util.Date;//from NowJava.com - 时  代  Java

import java.time.Instant;


public class Main {

  public static void main(String[] args) {

    // Get the current date

    Date dt = new Date();

    System.out.println("Date: " + dt);


    // Convert the Date to an Insatnt

    Instant in = dt.toInstant();

    System.out.println("Instant: " + in);


    // Convert the Instant back to a Date

    Date dt2 = Date.from(in);

    System.out.println("Date: " + dt2);

  }

}