Java获得当前时间

public class DateHandler {

 

 public static void main(String[] args) {

  DateHandler dh = new DateHandler();

  dh.getCurrentDateByDate();

  dh.getCurrentDateByCalendar();

 }

 

 // 使用Date类得到当前时间

 public void getCurrentDateByDate() {

  Date date = new Date();

  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  String currentDate = sdf.format(date);

  System.out.println("当期时间:" + currentDate);

 }

 

 // 使用Calendar得到当前时间

 public void getCurrentDateByCalendar() {

  Calendar calendar = Calendar.getInstance();

  String currentDate = calendar.get(Calendar.YEAR) + "-"

    + (calendar.get(Calendar.MONTH) + 1) + "-"

    + calendar.get(Calendar.DAY_OF_MONTH) + " "

    + calendar.get(Calendar.HOUR_OF_DAY) + ":"

    + calendar.get(Calendar.MINUTE) + ":"

    + calendar.get(Calendar.SECOND);

  System.out.println("当期时间:" + currentDate);

 }

  

 public void getHour(){

  //12小时

  SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

  //24小时

  SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

   

  Calendar c = Calendar.getInstance();

  c.get(Calendar.HOUR);//12小时

  c.get(Calendar.HOUR_OF_DAY);//24小时

 }

}