java使用Calendar獲得當前的日期和時間

import java.util.Calendar;
class ACalendar
{
	public static void main(String args[]) 
	{
		String months[] = {//初始化數組 
							"Jan", "Feb", "Mar", "Apr", 
				             "May", "Jun", "Jul", "Aug",
				             "Sep", "Oct", "Nov", "Dec"};
    Calendar aCalendar = Calendar.getInstance();//用默認時區得到對象
    System.out.print("Date: ");// 顯示當前日期
    System.out.print(months[aCalendar.get(Calendar.MONTH)]); //使用常數
    System.out.print(" " + aCalendar.get(Calendar.DATE) + " ");
    System.out.println(aCalendar.get(Calendar.YEAR));
	System.out.print("Time: ");//顯示和時間
    System.out.print(aCalendar.get(Calendar.HOUR) + ":");//打印時間
    System.out.print(aCalendar.get(Calendar.MINUTE) + ":");
    System.out.println(aCalendar.get(Calendar.SECOND));
    aCalendar.set(Calendar.HOUR, 10); // 設置時間
    aCalendar.set(Calendar.MINUTE, 29);
    aCalendar.set(Calendar.SECOND, 22);
	System.out.print("Updated time: ");//顯示設置后的時間
    System.out.print(aCalendar.get(Calendar.HOUR) + ":");//打印時分秒
    System.out.print(aCalendar.get(Calendar.MINUTE) + ":");
    System.out.println(aCalendar.get(Calendar.SECOND));
  }
}