Doubts about the Java time format

In Java, date () is no type one said, we call the time format, time type refers to the format after conversion to a string, does not mean the format of Date ();

  public void testdate ()  {      //defines the time, and its format defaults to:tue  jun 09 11:11:30 gmt+08:00 2015 This style       Date date  = new date ();           //output: Tue Jun 09  11:11:30 GMT+08:00 2015           SYSTEM.OUT.PRINTLN (date);        //define time conversion format        dateformat dfm =new simpledateformat ("Yyyy-mm-dd hh:mm:ss");       //converts a time into a string of the specified format           string time= Dfm.format (date);            //string after output transition format: 2015-06-09  11:35:52          system.out.println (Time);        try {           /* will be formatted as "YYYY-MM-DD HH:MM:SS"             *  date display is still tue  when converted to time jun 09 11:11:30 gmt+08:00 2015 This style              */           date dm=dfm.parse ( Time.tostring ());                // Verify that the output is:tue jun 09 11:35:52 gmt+08:00 2015                system.out.println (DM);                //converted to string output as: tue jun 09 11:35:52 gmt+ 08:00 2015                System.out.println (dm.tostrING ());      } catch  (parseexception e)  {            e.printstacktrace ();       }  }   background output is:         tue jun 09 11:11:30  GMT+08:00 2015        2015-06-09 11:36:48         Tue Jun 09 11:36:48 GMT+08:00 2015         tue jun 09 11:36:48 gmt+08:00 2015

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Doubts about the Java time format