Who can tell how to validate a date in poor java?

My programm can let user to input date in the default dateformat. Before save it to database I'd validate if the input is valid date. buf I can't find any function to do it both in java.util.Date and java.sql.Date, my program is as follow:
DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT); // in default Locale
java.util.Date testdate;
input = jtfInDate.getText().trim();
if(!input.equals("")) {
try {
testdate = df.parse(input);
} catch(ParseException pe) {
JOptionPane.showMessageDialog(this,
"<html><font color=red size=4>invalid date format</font></html>",
"warning",
JOptionPane.WARNING_MESSAGE);
return false;
System.out.println("indate" +testdate);
If I input "dafafa" in the jtfInDate(is a JTextField),the DateFormat can detect that's invalid and throw ParseException. But when I input "9999-99-99", the DateFormat can parse it without Exception!!!
and print out as "indate=Thu Jun 07 00:00:00 CST 10007", year 10007!!!!
"9999-99-99" is obviously a invalid date format. Why DateFormat.parse() can think is OK?
Is this the java's excellency????
Could anyone tell me how to judge a string of date is valid?

You can use the setLenient method to tell the DateFormat object to stop trying to help you out, this should go some way toward getting you where you need to go. Check the API docs out for that.
Good Luck
Lee
PS: don't mind esran, he's not the sharpest tool in the shed, and is likely still trying to figure out the mess he documented in this thread:
http://forum.java.sun.com/thread.jsp?thread=519291&forum=31&message=2479820
So, I suppose a little slack is warrented

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