【持续更新】Java 时间相关

直接上代码：

 import java.util.*;
 import java.text.SimpleDateFormat;

 public class HelloWorld {
     public static void main(String[] args) {
         //可以方便地修改日期格式
         Date now = new Date();
         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
         String dateTime = dateFormat.format(now);
         System.out.println(dateTime);

         //可以对每个时间域单独修改
         Calendar c = Calendar.getInstance();
         int year = c.get(Calendar.YEAR);
         int month = c.get(Calendar.MONTH); //1月为0，2月为1，如此类推
         int date = c.get(Calendar.DATE);
         int hour = c.get(Calendar.HOUR_OF_DAY);
         int minute = c.get(Calendar.MINUTE);
         int second = c.get(Calendar.SECOND);
         System.out.println(year + "/" + (month + 1) + "/" + date + " " + hour + ":" + minute + ":" + second);
     }
 }

输出：

2019/03/25 17:19:34
2019/3/25 17:19:34