WHIZlabs scjp 1.4 simulator error?

Hi folks,

I have few doubts about WHIZlabs scjp 1.4 simulator. Today I was taking Practice Test 1. I think I found some errors. Due to them I was scored 54/61, while IMO it should be 56/61.
Do you agree with my comments below?

Q 44/61
Which of the following statements is correct with regard to threads?
A "Runnable" is a keyword within the Java language, used to identify classes which can exist as separate threads.
B "Runnable" is an interface, which classes can implement when they wish to execute as a separate thread.
C "Runnable" is a class, which classes can extend when they wish to execute as a separate thread.
D java does not support threads.
E None of the above.

Simulator says B is correct. Well, this was my first choice, but finally I've choosen E. In my opinion, the class must implement Runnable to be run as a separate thread. Can is not enough. Not the Thread implements Runnable.

Q 41/61
Which of the following can be used as a key of a HashMap or a HashTable
A int
B Object
C Char
D Integer
E Boolean
F Date

Answer: B,D,E,F. They say that "char" is not an Object. Well, char is not:-) but answer C was Char, not char. Definietly WHIZlabs error.

Q 40/61
Consider the following piece of code and select the correct statements:
.......
...
13. public void print()
14. {
15. System.out.println("Another test");
16. }
.....

One of the correct answers was:
Changing the code at line 13 to "public void print(int x) {" will allow the code to compile correctly.
It's obviously an error, as there would be two { chars - one at line 13, second at line 14.
Anyway, I choose one answer, simulator claims there are 2 correct answers, but gave me 1/1 point for this question anyway.

Q11/61 - I don't treat it as an error, but just as an question to you
Which of the following implement clear notion of one item following another (order)?
A List
B Set
C Map
D Iterator

Answer: "A is correct as list defines a framework for collections in sequence".
Isn't Iterator a better choice for one item following another, which in fact is [i]iterating[/b] ? Maybe I misunderstand the question, I'm not native English speaker.

PS. I'm taking Tiger SCJP this Thursday

Q 44/61
Which of the following statements is correct with regard to threads?
A "Runnable" is a keyword within the Java language, used to identify classes which can exist as separate threads.
B "Runnable" is an interface, which classes can implement when they wish to execute as a separate thread.
C "Runnable" is a class, which classes can extend when they wish to execute as a separate thread.
D java does not support threads.
E None of the above.

Simulator says B is correct. Well, this was my first choice, but finally I've choosen E. In my opinion, the class must implement Runnable to be run as a separate thread. Can is not enough. Not the Thread implements Runnable.

Well in my opinion , whether Thread implements Runnable interface , but it is not your concern , you can create thread by two method :
1] extends Thread class .
2] implements Runnable interface .
So can is proper ...

Best of luck to you for Tiger ...

I am taking it on friday . How is your preparation . Can you share with me , how you are preparing ...
Thanks .
[ March 01, 2005: Message edited by: rathi ji ]

Hi Adam,

As JDK 1.5 supports autoboxing/unboxing, primitive values like int, char, etc can now be used as a key of HashMap or HashTable. So answers for 1.4 may not be valid in 5.0.

Best of luck for your beta exam.

Joyce

And best of luck to you too, Rathi.

Q 41/61
Which of the following can be used as a key of a HashMap or a HashTable
A int
B Object
C Char
D Integer
E Boolean
F Date

Answer: B,D,E,F. They say that "char" is not an Object. Well, char is not:-) but answer C was Char, not char. Definietly WHIZlabs error.

primitive is char, but the wrapper class is Character not Char.

Originally posted by rathi ji:
Well in my opinion , whether Thread implements Runnable interface , but it is not your concern , you can create thread by two method :
1] extends Thread class .
2] implements Runnable interface .
So can is proper ...

However, Thread implements Runnable by inheritance. I think that question shouldn't be based on your code typing, but on the Objects flow. In this case, there always must be Runnable implemented.

Thanks Joyce

,
can you please give me answer of one question ( because you have taken beta ) , I never read IO section , And it is not looking possible for me to read that whole chapter ( it is very big chapter ) , so can you tell me how much it may affect the score ( how many question may come from this section ) ...

Can any body please give me any link where it is explained in short & simple way ...

Thanks a lot .

Originally posted by rathi ji:
Best of luck to you for Tiger ...
I am taking it on friday . How is your preparation . Can you share with me , how you are preparing ...
Thanks .

Thanks. I use K&B for Java 1.4, but imho it's not enough. Too low API details I think. And of course no 5.0 features. I strong base on beta exam objectives from Sun, tutorials from IBM's developer works (http://www-130.ibm.com/developerworks), tutorials from Sun documentation (about new 5.0 features). I saw developer's notebook, but somehow I didn't like it too much. K&B's language is much better for me. Plus, of course, about 3 years java practice now. Although, when heard of SCJP, I imagined there are a lot of things not known yet... my Java knowledge base increased a lot while preparing for SCJP

Ah, and of course, I look from time to time to JLS 3, but it's very formal... so it's not number one. And - did I mention javadocs?

Adam ,
It is like this sentance ,

you can log-in on javaranch , if you want to post any question .

So if you will change it like this :

If you want to post any question then you can log-in on javaranch .

then you are right , must is proper .

but in this original one can is proper :

you can log-in on javaranch , if you want to post any question .

hope it is right ...

Originally posted by Carol Enderlin:
primitive is char, but the wrapper class is Character not Char.

Ah, sure! Right... how could I misread it? Thanks, Carol!