Java·获取当前时间的三种方法

First：

Date day=new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(df.format(day));

Second：

Date date = new Date(System.currentTimeMillis());

String year = String.format("%tY", date);

String month = String.format("%tT" + "", date);

String day = String.format("%td", date);

System.out.println("今天是："+year+"-"+month+"-"+day);

Third：

Calendar c = Calendar.getInstance();//可以对每个时间域单独修改

int year = c.get(Calendar.YEAR);

int month = c.get(Calendar.MONTH);

int date = c.get(Calendar.DATE);

int hour = c.get(Calendar.HOUR_OF_DAY);

int minute = c.get(Calendar.MINUTE);

int second = c.get(Calendar.SECOND);

System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);