Generating random string not like - example

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
Hi,
I want to generate a random one char string of which is not like a char.
select str from (select DBMS_RANDOM.STRING('U',1) str from dual) where str!='A';
some times i am getting NULL. How can i get some char all the time? i want to create a function using this logic. can some one help me to achieve this?
Thanks,
sg

One more way to do this... (Without function)
WITH t AS (SELECT 'X' charac FROM DUAL) --- 'X' is the input
SELECT COLUMN_VALUE letter
FROM ( SELECT *
            FROM t a,
                 TABLE (sys.odcivarchar2list ('A',
                                              'B',
                                              'C',
                                              'D',
                                              'E',
                                              'F',
                                              'G',
                                              'H',
                                              'I',
                                              'J',
                                              'K',
                                              'L',
                                              'M',
                                              'N',
                                              'O',
                                              'P',
                                              'Q',
                                              'R',
                                              'S',
                                              'T',
                                              'U',
                                              'V',
                                              'W',
                                              'X',
                                              'Y',
                                              'Z')) b
           WHERE COLUMN_VALUE <> a.charac
        ORDER BY DBMS_RANDOM.VALUE ())
WHERE ROWNUM = 1;
Cheers,
Manik.

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How to generate random strings

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Hi It still shows juck character, below is the sample output.
We are using
t?O%q 298
?W?8! 424
pR*fz 12
]5dA? 310
Ek?7? 466
/@JYL 313
UNY 262
(⌂%3? 25
?z,?? 98
????q 414
V?0s? 370
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could someone please tell me if this code will generate a 'b' and a 'w'
if i tell it too. and how do i make it 5 characters long. And its says
this is how you call it and i dont have a clue what that means. and when
you answer this please dont use techincal terms cause im just learning
and i probaly wont have a clue what your talking about. thankyou.
<?php
// function to generate random strings
function RandomString($length=32)
$randstr='';
srand((double)microtime()*1000000);
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?>
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<?php
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Well, first of all this is PHP code and not Java. And I am not sure but I don't think it's possible to call PHP functions in Java Code (the otehr way around it should be working though, at least with the Java Extension for PHP). So, if you are writing a Java programm, you will probably have to translate this code piece to Java.
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PerformanceCounterName      :
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StartTime                   : 8/21/2013 4:08:50 PM
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Hi,
I tried everything above but to no avail. Windows firewall seemed to be allowing Firefox through without it actually being in the exception list. However, I did remove Firefox but this time removing all profile data too. Reinstalling Firefox seemed to make the websites work. However I then restored my bookmarks, and suddenly the websites stopped functioning again, displaying the random string of characters. Could this be an issue with my bookmarks?

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Generating random string not like - example

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