import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class CalendarUse {
public static void main(String[] args) throws ParseException {
Calendar calendar=Calendar.getInstance();
calendar.setTime(new Date());
String year=String.valueOf(calendar.get(Calendar.YEAR));
String month=String.valueOf(calendar.get(Calendar.MONTH)+1);
String day=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));
String week=String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);
System.out.println("现在时间是:"+year+"年"+month+"月"+day+"日,星期"+week);
Date date=calendar.getTime();
calendar.setTime(date);
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String s= df.format(date);
Date d= df.parse("2000-01-01");
Date date1=df.parse("2020-02-15");
Date date2=df.parse("2000-01-01");
Date date3=df.parse("2000-01-01");
System.out.println(date1.compareTo(date2));
System.out.println(date2.compareTo(date1));
System.out.println(date2.compareTo(date3));
System.out.println(date1.before(date2));
System.out.println(date1.after(date2));
System.out.println(date2.equals(date3));
}
}