Java獲取當前時間的年月日方法

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateTest {

    public static void main(String[] args) throws ParseException {
        Calendar now = Calendar.getInstance();
        System.out.println("年: " + now.get(Calendar.YEAR));
        System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
        System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
        System.out.println("時: " + now.get(Calendar.HOUR_OF_DAY));
        System.out.println("分: " + now.get(Calendar.MINUTE));
        System.out.println("秒: " + now.get(Calendar.SECOND));
        System.out.println("當前時間毫秒數：" + now.getTimeInMillis());
        System.out.println(now.getTime());

        Date d = new Date();
        System.out.println(d);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateNowStr = sdf.format(d);
        System.out.println("格式化後的日期：" + dateNowStr);

        String str = "2012-1-13 17:26:33";  //要跟上面sdf定義的格式一樣
        Date today = sdf.parse(str);
        System.out.println("字符串轉成日期：" + today);
    }
}