Java system time and a specified format

. 1  Import the java.text.DateFormat;
 2  Import java.text.ParseException;
 . 3  Import the java.text.SimpleDateFormat;
 . 4  Import java.util.Date;
 . 5  
. 6  public  class the Test {
 . 7  
. 8      public  static  void main (String [] args) {
 9          // initialize a date type, attention to initial values 
10          Date date = null ;
 . 11          // If a new Date object directly, the system uses a time 
12 is          Date SystemDate = new Date ();
 13 is          //Here the use of a simple transition new date format object that specifies the format (year - month - day) 
14          DateFormat format = new SimpleDateFormat ( "yyyy-MM-dd" );
 15          // specify the format (year - month - Day : minutes: seconds) 
16          DateFormat = format1 new new the SimpleDateFormat ( "the mM-dd-YYYY HH: mm: SS" );
 . 17          the try {
 18 is              // by the method of forming the format object custom date 
. 19              dATE = format.parse ( "2019 -5-21 " );
 20 is          } the catch (a ParseException E) {
 21 is              e.printStackTrace ();
 22 is          }
 23 is          // date not specified format, the output of the system acquisition 
24         System.out.println ( "current system date:" + SystemDate);
 25          // annual output system acquired - month - May 
26          System.out.println ( "current system date:" + format1.format (SystemDate));
 27          // output system acquired year - month - day hour: min: sec 
28          System.out.println ( "current system date:" + format.format (SystemDate));
 29          // annual output custom - month - day 
30          System.out.println ( "date from the definition:" + format.format (dATE));
 31 is          
32      }
 33 is  
34 is }