How to judge if the resultset having empty rows?

Hi,

I have a problem when processing a resultset.

....

ResultSet rs = null;

rs = statement.executeQuery(SQLstr);

if ( rs != null ) {

//doSomeThingWith the rs

} else {

// warning the user

}

I found that the else clause never been executed even thought the rs get empty set from mysql.

the following is a example when I manually execute the select SQL within mysql:

mysql>select * from tableName where mobile='1383322331';

Empty set (0.01 sec)

[531 byte] By [ioiioia] at [2007-10-3 5:22:15]