import java.text.ParseException;

 import java.text.SimpleDateFormat;

 import java.util.Calendar;

 import java.util.Date;

 public class MyUseSimpleDateFormat {

     public static void main(String[] args) {

         /**

          * Date类通过getTime()返回long

          * 通过void setTime（long time）设置时间

          */

         Date date = new Date();

         long time = date.getTime();

         date.setTime(time);

         /**

          * SimpleDateFormat通过format（）格式化为字符串

          * 通过parse（String str）转为Date

          */

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

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

         try {

             Date newDate = sdf.parse("1998-11-22 12:22:153");

             System.out.println(newDate);

         } catch (ParseException e) {}

         /**

          * Calendar通过getTime（）方法转为Date

          * Date通过setTime设置Calendar

          */

         Calendar cal = Calendar.getInstance();

         Date dt = cal.getTime();

         System.out.println(dt);

         cal.setTime(dt);

     }

 }