Java 使用jdk8的新特性LocalDate和LocalDateTime 實現當前時間，日期加減，是否閏年，時間戳，時間線程每秒改變一次

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Created by 夜未央 on 2017/11/26.
 */
public class Time {
    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                LocalDate today = LocalDate.now();
//        System.out.println(today);
//        System.out.println("current time:" + today.atTime(LocalTime.now()));
//
//        //檢查當前年是否爲閏年
//        System.out.println(today.getYear() + "是閏年嗎？" + today.isLeapYear());


                //當前時間
//        LocalTime time = LocalTime.now();
//        System.out.println(time);

//        //當前日期時間
                LocalDateTime current = LocalDateTime.now();
                //    System.out.println(current);

                //時間戳
//        Instant timeStamp = Instant.now();
//        System.out.println(timeStamp);
//
                //日期加減操作
//        System.out.println("10天后是：" + today.plusDays(10));
//        System.out.println("3周後是：" + today.plusWeeks(3));
//        System.out.println("15個月後是：" + today.plusMonths(15));
//
//        System.out.println("8天前是：" + today.minusDays(8));
//        System.out.println("4周前是：" + today.minusWeeks(4));
//        System.out.println("9個月前是：" + today.minusMonths(19));

//        //日期格式化
//                    System.out.println(today.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
                System.out.println(current.format(DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH:mm:ss")));

            }
        };
        ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        scheduledExecutorService.scheduleAtFixedRate(runnable,2,1, TimeUnit.SECONDS);
    }
}