java日期操作執行個體

import java.util.*;
import java.util.*;
import java.text.*;
public class Default {
 public static void main(String[] args) 
 {
 Locale aLocale = Locale.JAPAN;
 Locale.setDefault(aLocale);
 System.out.println("Locale: " + aLocale);
 System.out.println("ISO 2 letter: "+ aLocale.getLanguage());
 System.out.println("ISO 3 letter: " + aLocale.getISO3Language());
 System.out.println("Date:"+getStringDateShort());
 System.out.println("year:"+getYear());
 System.out.println("month:"+getMonth());
 System.out.println("day:"+getDay());
 aLocale = Locale.US;
 Locale.setDefault(aLocale);
 System.out.println("Locale:" + aLocale);
 System.out.println("ISO 2 letter: " + aLocale.getLanguage());
 System.out.println("ISO 3 letter: " + aLocale.getISO3Language());
 System.out.println("Date:"+getStringDateShort());
 System.out.println("year:"+getYear());
 System.out.println("month:"+getMonth());
 System.out.println("day:"+getDay());
 System.out.println("Default Local:"+Locale.getDefault());
 TimeZone tz=TimeZone.getDefault(); 
 System.out.println(tz);
 ResourceBundle bundle = ResourceBundle.getBundle("Dorian",Locale.US); 
 System.out.println(bundle.getString("red.label")); 
 }
    public static String getStringDateShort(){
        Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        String dateString = formatter.format(currentTime);
        return dateString;
    }
    public static int getDay(){
        GregorianCalendar currentDay = new GregorianCalendar();
        int today=currentDay.get(Calendar.DAY_OF_MONTH);
        return today;
    }
    public static int getMonth(){
        GregorianCalendar currentDay = new GregorianCalendar();
        int month=currentDay.get(Calendar.MONTH)+1;
        return month;
    }
    public static int getYear(){
        GregorianCalendar currentDay = new GregorianCalendar();
        int year=currentDay.get(Calendar.YEAR);
        return year;
    }
}