java 獲取當前時間的三種方法
https://blog.csdn.net/c851204293/article/details/91801973

1.通過Util包中的Date獲取

Date date = new Date();



SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd :hh:mm:ss");



System.out.println(dateFormat.format(date));

2.通過Util包的Calendar 獲取

Calendar calendar= Calendar.getInstance();
 



SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd :hh:mm:ss");



System.out.println(dateFormat.format(calendar.getTime()));

3.通過Util包的Calendar 獲取時間，分別獲取年月日時分秒

Calendar cal=Calendar.getInstance();      




int y=cal.get(Calendar.YEAR);      




int m=cal.get(Calendar.MONTH);      
 




int d=cal.get(Calendar.DATE);      




int h=cal.get(Calendar.HOUR_OF_DAY);      




int mi=cal.get(Calendar.MINUTE);      




int s=cal.get(Calendar.SECOND);      



System.out.println("現在時刻是"+y+"年"+m+"月"+d+"日"+h+"時"+mi+"分"+s+"秒");

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參考：https://blog.csdn.net/qq_34682683/article/details/78716547