java8 new features LocalDateTime string rotation time comparison size (5)

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;import java.util.Date;

public class TimeCompare {

    public static void main(String[] args) {
//        String time1 = "2019-06-26 19:00:00";
//        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//有漏洞，建议不要用
//        Date date1;
//        try {
//            date1 = sdf.parse(time1);
//            Date date2 = new Date();
//            System.out.println(date1.before(date2));
//            System.out.println(date1.after(date2));
//        } catch (ParseException e) {
//            e.printStackTrace();
//        }
        //第一种
        String time1 = "2019-06-26 19:00:00";
        DateTimeFormatter dtf2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        Localdateti to localdateti to = , if localdatetime.p (time1, dtf2);
        System.out.println (localDateTime.isBefore (LocalDateTime.now ())); // Your time is true before the current time 
        System.out.println (localDateTime.isAfter (LocalDateTime.now ())); // In after the current time is to false 
　　　　 // second
　　　　 the LocalDateTime LocalDateTime.now = now (); 
　　　　 the Duration DURATION = Duration.between (now, now); 
        System.out.println (DURATION); 
        Long Days duration.toDays = (); / / number of days difference between the
         long hours = duration.toHours (); number of hours difference //
         long minutes = duration.toMinutes (); number of minutes difference //
         Long duration.toMillis of millis = (); // difference milliseconds
         long nanos duration.toNanos = (); // number of nanoseconds difference 
        System.out.println (millis);
　　　　 //第三种
        long mills = now.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
        System.out.println(mills >= System.currentTimeMillis());

    }

}