Abbu Rahman

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since Jan 05, 2004
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Recent posts by Abbu Rahman

hi,
I am trying to find what exams one has to take in order to be an OCA (9i), the oracle websitesays we need to take two exams

1. Exam #1Z0-007 Introduction to Oracle9i: SQL (or) Exam #1Z0-001 Introduction to Oracle: SQL and PL/SQL

2.Exam #1Z0-147 Oracle9i: Program with PL/SQL

Now if I choose #1Z0-001 and #1Z0-147, does it work ? cause PL/SQL is repeated in both exams.

and at some other place i read that for OCA we need to take
1.#1Z1-007
2.#1Z1-031

now whats the difference between #1Z0 and #1Z1 exams

plz help ,
Rafay
17 years ago
i believe u know about how string litrals/constants are handled .

String s3 = s1.substring(4,7), s4 = s2.substring(0,3);

in this case the substring returns a "new" string every time and hence s1==s2; //false

hope that helps.
let me try,

class XYZClass
{
/************************************/
}

x instanceof XYZClass (= true)
if x refres to an object which is of type XYZClass or any of its subclasses.

x instanceof XYZClass (= false)
if x refres to an object which is super calss of XYZClass.

example:
Object obj = new Object();
obj instanceof XYZClass = false //obj is superclass of XYZClass


String x = "";
x instanceof XYZClass (= error)
does not compile , because String and XYZClass not at all related.
neither String is subclass to XYZClass nor is it superclass of XYZClass.


hope that helps,
Rafay
[ August 20, 2004: Message edited by: Abdul Rafay Mansoor ]
quick hack here,

RuntimeException,Error and all their subclass are unchecked exceptions .
meaning :
if these exceptions are thrown and not caught - its ok
if these exceptions are not thrown and but caught - even then its ok

-------------------
rest all exception are checked exceptions

if these exceptions are thrown and not caught - its NOT ok
if these exceptions are not thrown and but caught - even then its NOT ok

-------------------
EXCEPTION to this rule

Exception, Throwable are both checked exceptions BUT

if these exceptions are not thrown and but caught - then its ok

--------------------

if you can remember this you can pass SCJP
if you want to know why ? then this might help http://www.javaworld.com/javaworld/javatips/jw-javatip134-p2.html

Hope that helps
Rafay
[ August 20, 2004: Message edited by: Abdul Rafay Mansoor ]
dont know exactly abt ur problem,
but once i had a problem with classpath...i solved it by making it uppercase ie. CLASSPATH. so just check if its J2ee_home or J2EE_HOME.

Originally posted by Alfred Harre:
Dear Galder Zamarre´┐Żo
AdviceClient.java:5: package javax.ejb does not exist
import javax.ejb.*;
Regards


try putting j2ee.jar in CLASSPATH as u have done for AdviceAppClient.jar.
else (in win2k) add j2ee.jar path to envornment variable CLASSPATH.
hope that helps.
Rafay
This might be the first choice, just 16MB.
Hi,
i just deployed AdviceBean.,
when will i get to see "ejb passivate" message ?
and how can i make passivation faster in j2ee server?
Thanks
Rafay

Originally posted by Mylene Reiners:
using the directions given in the book...



page number plz .
Try this
(till some Sagacious soul helps us out )
remove package statements from all 3 java files.
go to evnironment variable and put this for CLASSPATH = C:\java\j2sdkee1.3.1\lib\j2ee.jar;.
ie place a dot at the end .
come back and compile all 3 java file.

Originally posted by Dale Seng:

javac -classpath c:\j2sdkee1.3.1\lib\j2ee.jar;c:\ejbbook\projects\advice\AdviceA
ppClient.jar AdviceClient.java


well I have the same problem here , but you have shown how to compile AdviceClient.java ... but here we want to compile AdviceHome.java
correct sonali ???
hello,
I am using Poseidon to draw sequence diagrams, iam kind of looking at code and drawing the UML (dont know what its called) ... now i have a lot of problems here.. i have searched for sequence examples but all i get is Hello World kind of things
...can someone give me links to some serious sequence diagram tutorials/examples , please.
thanks
Rafay
Hello ,
I am trying to use Jace tools ...
I feel the documentation is insufficient, can someone give me useful links on jace . please.
[ February 11, 2004: Message edited by: Abdul Rafay Mansoor ]
18 years ago
someOne answer me please
whats the difference between refrence and a pointer ??
and what is opaque refrence ??
trying to demistify "JNI Programmer's Guide"
someOne answer me please
18 years ago