java中Calendar类
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1.测试代码:
1 package com; 2 3 import java.text.SimpleDateFormat; 4 import java.util.Calendar; 5 import java.util.Date; 6 7 /** 8 * Created by huyanxia on 2017/9/30. 9 */ 10 public class calendarTest { 11 public static void main(String[] args) { 12 Calendar calendar = Calendar.getInstance(); 13 Date date = new Date(); 14 calendar.setTime(date); 15 int day = calendar.get(Calendar.DAY_OF_YEAR); 16 int month = calendar.get(Calendar.DAY_OF_MONTH); 17 int second = calendar.get(Calendar.SECOND); 18 int maxdays = calendar.getActualMaximum(Calendar.DAY_OF_YEAR); 19 int mindays = calendar.getActualMinimum(Calendar.DAY_OF_YEAR); 20 int maxmonths = calendar.getActualMaximum(Calendar.DAY_OF_MONTH); 21 int minmonths = calendar.getActualMinimum(Calendar.DAY_OF_MONTH); 22 //int day = calendar.get(Calendar.DAY_OF_YEAR); 23 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("YYYY-MM-dd-HH-mm-ss"); 24 System.out.println("现在时间"+simpleDateFormat.format(date)); 25 System.out.println("今天是2017年的第几天:"+day); 26 System.out.println("今天是2017年的9月第几天:"+month); 27 System.out.println("当前的秒数:"+second); 28 System.out.println("今年天数最大值:"+maxdays); 29 System.out.println("今年天数最小值:"+mindays); 30 System.out.println("月份最大值:"+maxmonths); 31 System.out.println("月份最小值:"+minmonths); 32 } 33 }
结果:
注意:格式化时,年月日时分秒:“YYYY-MM-dd-HH-mm-ss”(24小时制)
“YYYY-MM-dd-hh-mm-ss”(12小时制)
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