How to convert a String("yyyy-mm-dd") to the same but in Date format ?

Question

Hi,
can anyone plz tell me how to convert a String to a date format.I'm using MSACCESS database.I want to store this string in the database.So i need to convert it to a date format since the table is designed such a way with date/time type for date field.I used SimpleDateFormat ,but i can't able to convert.The code is given below:
coding:
public String dateconvertion(String strDate)
try
SimpleDateFormat sdfSource = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdfSource.parse(strDate);
SimpleDateFormat sdfDestination = new SimpleDateFormat("yyyy-MM-dd ");
strDate = sdfDestination.format(date);
catch(ParseException pe)
System.out.println("Parse Exception : " + pe);
return(strDate);
}

Answer 1

i used prepared statement even now i am getting error like this.....
i have included the prepared statement package also...
my coding:
ResultSet rsdatetemp = null;
PreparedStatement ps = null;
String query ="select distinct itemcode from sales where bill date between ? and ?";
ps = precon.prepareStatement(query);
ps.setDate(1,d1);//d1 and d2 are in date format
ps.setDate(2,d2);
rsdatetemp = ps.executeQuery();
error :
symbol : method setDate(int,java.util.Date)
location: interface java.sql.PreparedStatement
ps.setDate(1,d1);
symbol : method setDate(int,java.util.Date)
location: interface java.sql.PreparedStatement
ps.setDate(2,d2);