Java中獲取當前時間並格式化

主要有兩種方式，代碼如下：

//使用Calendar
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));

//使用Date
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("當前時間：" + sdf.format(d));