LocalDateTime

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.time.LocalDateTime;


public class PrintCurrentDateTime {

    public static void main(String[] args) {

           DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
           //get current date time with Date()
           Date date = new Date();
           System.out.println(dateFormat.format(date));

           //get current date time with Calendar()
           Calendar cal = Calendar.getInstance();
           System.out.println(dateFormat.format(cal.getTime()));

           LocalDateTime dt = LocalDateTime.now();
           System.out.println(dt);

      }

}