SCJP 5 Questions

Hi all,

I have few unsolved questions. Could anyone please provide me with answers. I'm writing the exam within 2 days. Plz reply ASAP.

Here goes the list.............

Question 1 :

Encapsulation involve separating the interface of class from implementation. Yes or No.

Question 2 :

wait() and notify() methods are defined in Thread class ? Yes or No?

I knew that they are in Object class but Thread itself extends Object so they are available in Thread class too.
What should be my answer Yes or No?

Question 3:
following regular expression will match non digit character "\D". True or False ?

I'm confused coz, "\D" is evaluated as non-available escape sequence (Error) whereas "\\D" is correct. If so answer is False.

Correct me if i'm wrong.

Thanks
Sundeep

Originally posted by Sundeep Gupta:

Question 2 :

wait() and notify() methods are defined in Thread class ? Yes or No?

I knew that they are in Object class but Thread itself extends Object so they are available in Thread class too.
What should be my answer Yes or No?

Answer: No

Object class defines those methods
Thread class inherits those methods

regards,
MZ

But in one of the mock exam (A.K Gupta's exam)it is stated that they are in Thread class. The problem was like this :

Which of the methods are defined in Thread class :

a. wait()
b. notify()
c. terminate()
d. yield()
e. sleep()

and answer was a, b, d, and e. Is this correct or d,e is the correct answer ?

Thanks
Sundeep

I recommend taking a look at the official documentation to get a definitive answer to this question. Try the following links.

http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html