java Calendar的常用方式

import java.util.Calendar;
Calendar calendar = new GregorianCalendar();

Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());//當前時間

int year = c.get(Calendar.YEAR);    //獲取年
int month = c.get(Calendar.MONTH) + 1;   //獲取月份，0表示1月份
int day = c.get(Calendar.DAY_OF_MONTH);    //獲取當前天數
int first = c.getActualMinimum(c.DAY_OF_MONTH);    //獲取本月最小天數
int last = c.getActualMaximum(c.DAY_OF_MONTH);    //獲取本月最大天數
int time = c.get(Calendar.HOUR_OF_DAY);       //獲取當前小時
int min = c.get(Calendar.MINUTE);          //獲取當前分鐘
int xx = c.get(Calendar.SECOND);          //獲取當前秒


SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String curDate = s.format(c.getTime());  //當前日期
System.out.println("當前時間："+year + "-" + month + "-"+ day + " "+time + ":" + min +":" + xx);
System.out.println("第一天和最後天：" + first +"," + last);
System.out.println("當前日期curDate：" + curDate);


c.add(Calendar.YEAR, 1); //增加一年
c.add(Calendar.MONTH, 1);//增加一個月
c.add(Calendar.DAY_OF_MONTH, 1);//增加一天
int year2 = c.get(Calendar.YEAR);
int month2 = c.get(Calendar.MONTH) + 1;
int day2 = c.get(Calendar.DAY_OF_MONTH);
int firstD = c.getActualMinimum(c.DAY_OF_MONTH);
int lastD = c.getActualMaximum(c.DAY_OF_MONTH);
System.out.println("當前時間："+year2 + "-" + month2 + "-"+ day2 + " "+time + ":" + min +":" + xx);
System.out.println("第一天和最後天：" + firstD +"," + lastD);