calendar

calendar

补充date类

• • Date表示特定的瞬间，精确到毫秒，Date类中的大部分方法以及被calender取代

  • package Calendaer;
    
    import java.time.LocalDate;
    import java.util.Date;
    
    public class Demodate {
        public static void main(String[] args) {
            //1.创建DAte对象
            Date date1 = new Date();
            System.out.println(date1.toString());
            System.out.println(date1.toLocaleString());
            //昨天
            Date date2 = new Date(date1.getTime()-(60*60*24*1000));
            System.out.println(date2.toLocaleString());
            //2.方法after before
            boolean  b1=date1.after(date2);
            System.out.println(b1);
            boolean  b2=date1.before(date2);
            System.out.println(b2);
            //比较compareTo（）；
            int d=date2.compareTo(date1);
            System.out.println(d);
            //equals
            boolean  d2=date1.equals(date2);
    

  • Calendar

  • package Calendaer;
    
    import java.util.Calendar;
    
    public class Demo01 {
        public static void main(String[] args) {
            Calendar calendar=Calendar.getInstance();
            System.out.println(calendar.getTime().toLocaleString());
            System.out.println(calendar.getTimeInMillis());
            //获取时间信息
            //获取年
            int year=calendar.get(Calendar.YEAR);
            //获取月
            int month=calendar.get(Calendar.MONTH);
            //天
            int day=calendar.get(Calendar.DAY_OF_MONTH);
            //小时
            int hour=calendar.get(Calendar.HOUR);
            //分钟
            int minute=calendar.get(Calendar.MINUTE);
            //秒
            int second=calendar.get(Calendar.SECOND);
            System.out.println(year+"年"+month+"月"+day+"日"+hour+":"+minute+":"+second);
    
            //3,修改时间
            Calendar calendar2=Calendar.getInstance();
            calendar2.set(Calendar.DAY_OF_MONTH,26);
            System.out.println(calendar2.getTime().toLocaleString());
    
            //4.add修改时间
            calendar2.add(Calendar.HOUR,-1);
            System.out.println(calendar2.getTime().toLocaleString());
    
            //5.补充方法
            int max=calendar2.getActualMaximum(Calendar.DAY_OF_MONTH);
            int min=calendar2.getActualMinimum(Calendar.DAY_OF_MONTH);
            System.out.println(max);
            System.out.println(min);
        }