java中Calendar类
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）
