Java 時間比較

 

import java.text.*;import java.util.*;public static void main(String arg[]){   String date = "";      SimpleDateFormat  sdf=  new   SimpleDateFormat("yyyy-MM-dd");      java.util.Date   dd     =   Calendar.getInstance().getTime();       date = sdf.format(dd);   System.out.println(date);    boolean flag = isDateBefore(date+" 09:01:00");  System.out.println(flag);}public static boolean isDateBefore(String date2){      try{Date date1 = new Date();DateFormat df = DateFormat.getDateTimeInstance();System.out.println(date1.before(df.parse(date2)));return date1.before(df.parse(date2)); }catch(ParseException e){System.out.print(e.getMessage());return false;}}}public static boolean isDateAfter(String date2){try{Date date1 = new Date();DateFormat df = DateFormat.getDateTimeInstance();System.out.println(date1.after(df.parse(date2)));return date1.after(df.parse(date2)); }catch(ParseException e){System.out.print(e.getMessage());return false;}}上下班時間可以通過這個時間來比較是否遲到或早退