java 关于Calender类及日期格式化

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

 

public class tt {

 

public static void main(String[] args) {

Calendar c = Calendar.getInstance();

System.out.println(c.getActualMaximum(c.DAY_OF_MONTH));//当前月最后一天

System.out.println(c.getActualMinimum(c.DAY_OF_MONTH));//当前月第一天

c.getTime();

c.set(c.DAY_OF_MONTH, c.getActualMaximum(c.DAY_OF_MONTH));

Date date1=c.getTime();

c.set(c.DAY_OF_MONTH, 1);

c.set(c.MONTH, c.MONTH-2);

Date date2=c.getTime();

//设定日期格式

SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd");

System.out.println(sf.format(date1));;

System.out.println(sf.format(date2));;

 

}

}