jdk1.8 之时间类

package com.github.wxpay.sdk;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

/**
 * jdk1.8新特性   LocalDateTime
 */
public class Time {

    public static void main(String[] args) {

        List<String> list = new ArrayList <>(  );
        for (int i = 0; i < 12; i++) {
          list.add( timeToString( getDate().plusHours( 2*i ) ) );
        }
     list.stream().forEach( s -> System.out.println(s) );
    }

    //获取到当前日期的00:00:00
    public  static LocalDateTime getDate() {
        //获取当前时间
        LocalDateTime now = LocalDateTime.now();
        //获取当前时间的小时值
        int hour = now.getHour();
        //获取当前时间的分钟值
        int minute = now.getMinute();
        //获取当前时间的秒数值
        int second = now.getSecond();
        //当前时间减去小时,分钟,秒
        LocalDateTime localDateTime = now.plusHours( -hour ).plusMinutes( -minute ).plusSeconds( -second );
        //返回处理后的时间
        return localDateTime;
    }

   //解析时间格式的方法
    public static String  timeToString(LocalDateTime localDateTime){
       //定义解析格式
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern( "yyyy-MM-dd HH:mm:ss" );
        String time = localDateTime.format( formatter );
        return time;
    }

}

输出:

2020-12-20 00:00:00
2020-12-20 02:00:00
2020-12-20 04:00:00
2020-12-20 06:00:00
2020-12-20 08:00:00
2020-12-20 10:00:00
2020-12-20 12:00:00
2020-12-20 14:00:00
2020-12-20 16:00:00
2020-12-20 18:00:00
2020-12-20 20:00:00
2020-12-20 22:00:00

 

 

常用API

 

now()   //获取当前系统时间
getYear() //获取年份
详情查看JDK1.8文档