Parse in DateFormat always throws java.text.ParseException:Unparseable date problem

Today, using the DateFormat parse method, always report a java.text.ParseException:Unparseable date error.

The easiest way to use the idea is:

DateFormat df = new SimpleDateFormat ();
Date d = df.parse (new Date (). toString ());

This will cause an error.

Later on the Internet to see that the parse method inside the string must be the same as the format given by DF, will not be an error. The above code is then changed to:

Date d = Df.parse (Df.format (New Date ());

Problem can be solved.