transient and protected fields cannot be serialized ?

[Vaibhav Shridish]

Question)Class fields with the following modifiers will not be serialized
a)private,
b)static,
c)transient,
d)protected
Ans = c,d.
Can someone explain ?

[Roy Ben Ami]

transient fields wont serialize cause that is what the transient key word do (wont seriliaze the fields).
about the protected.. no clue....

[Paul Villangca]

Where did you get this question Vaibhav? I've never seen anything that says the protected (or public/private, for that matter) modifier affects serialization.

[Valentin Crettaz]

From Java Tutorial : Providing Object Serialization for Your Classes

This method automatically writes out everything required to reconstruct an instance of the class, including the following:
- Class of the object
- Class signature
- Values of all non-transient and non-static members, including members that refer to other objects

So the correct answers should be b) and c).
Private and protected (instance) fields are serialized since they pertain to the object itself.

[Vaibhav Shridish]

Hey paul
i got that question from this link
http://sanjayahuja.tripod.com/tech/scjp/scjp.html
i could get only 5/20 in the questions from 181
to 200 .....
valentin... Thanks for that link ...
can you let me know how much do you think one
should be scoring in the 200 questions in the
link above?

[Paul Villangca]

I've done the first hundred, and guess what - they're all Marcus Green exam questions! So I guess you should be okay with a score of around 80%.
Update: heh, questions seem come from an outdated version of the exam. Some of the questions are still poorly worded, like question #102 (Green's Exam 2-42.)
[ June 19, 2002: Message edited by: Paul Villangca ]

[Vaibhav Shridish]

Good work paul .. i got only 70% in the 1st 100
and guess whatttttt the remaining 100 drove me
crazy and made me forget the basics for a moment
i had spent 2 days analysing the mistakes i have
committed in the remaining 100 and am not yet done
and particularly those questions on strings I
tell you .... 2&^*(^(*&^$&*&6 DROVE ME LITRALLY
mad ... i did an exhausting testing on the way
string class works and found out its really
really wierd. ..
i shall post those questions on strings later
today ....
when are you taking your certification exam ?

[Paul Villangca]

About the questions on Strings, there's a basic rule I follow:
When a String method will return a String that has the same contents as the original String, it returns the original String object instead. Got that?
For example:
"Hello!".trim() == "Hello!"
returns true.

As for the other difficult ones, well... my only advice is to compile and run them to see what happens.

[Vaibhav Shridish]

Yeah thanz a lot paul ...
Actually i DISCOVERED that yesterday night ....
and that was the weird behaviour i was talking
abt and never understood properly untill i
experimented again and again.