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Tript/traps for SCJP

shuba gopal
Ranch Hand

Joined: May 12, 2011
Posts: 76
"Watch for Math class being an option for immutable classes"

What are immutable classes? Final classes?
Ikpefua Jacob-Obinyan
Ranch Hand

Joined: Aug 31, 2010
Posts: 394

shuba gopal wrote:"Watch for Math class being an option for immutable classes"

Hello Shuba, the API indicates that Math class is a final class, meaning you have to abide by the regulations...The Dos and Donts of a final class, for example they CANNOT be subclassed, the exam creators will NOT set a "Trip-Trap" for you on wrapper classes or Strings because its easy for you to notice the "Trap"...

HtH

Ikpefua


OCPJP 6.
In Your Pursuit Towards Certification, NEVER Give Up.
shuba gopal
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Joined: May 12, 2011
Posts: 76
Thanks
Deepak Bala
Bartender

Joined: Feb 24, 2006
Posts: 6662
    
    5

The Math class is not part of the SCJP.

Marking a class final does not make it immutable. This wiki article is a good starting point to learn about immutability - http://en.wikipedia.org/wiki/Immutable_object


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Ikpefua Jacob-Obinyan
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Joined: Aug 31, 2010
Posts: 394

Deepak Bala wrote:The Math class is not part of the SCJP.

Hello Deepak...I didnt know that..Thank you for the information.

Regards

Ikpefua
 
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subject: Tript/traps for SCJP