DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

1. 使用Date()获取当前日期时间

1. get current date time with Date()

//get current date time with Date()
   Date date = new Date();
   System.out.println(dateFormat.format(date));
   jTextField3.setText(dateFormat.format(date));

//get current date time with Calendar()
   Calendar cal = Calendar.getInstance();
   jTextField3.setText(dateFormat.format(cal.getTime()));