Help with multiple choice questions :)

I'm currently revising for a java test and wondered if you guys could help me out :)

Consider the method in the line of code below. Which statement is true?
Button. addActionListener (this);

A ‘this’ refers to the button that is to be used
B ‘this’ refers to the procedure call add Action Listener
C ‘this’ is a hidden pointer to the AWT
D ‘this’ refers to this applet


Public class member Exception extends Exception { } and

A defines the Exception class and required methods to deal with all
exceptions
B extends the exception class to provide methods not covered by the standard
library
C extends the exception class to provide handlers for exceptions raised in
your code
D extends the exception message text.

The keyword super is used to:

A permit polymorphism in inheriting classes
B access a member function of the base class
C prevent access to data numbers in the base class
D protect data members in the base class so that they can be accessed by, but not
changed by, inheriting classes

10. The Flow Layout Manager?
A Sets the size of the GUI Frame
B Allows the programmer complete control over GUI object placement.
C Organises GUI objects in the sequence in which they are specified
D Sets the size of Panel Objects.

11. Consider the Super Class. Which statement is true?
A Super is a keyword NOT a Class
B The Super Class Is the Base Class
C The Base Class Extends the Super Class
D The Super Class Extends the Base Class

13. Consider The C++ Enum Type. Which statement is true?
A Java supports Enums For Compatibility.
B Java Does not support the Enum type.
C In Java Enums are implicit to the compiler.
D Java supports Enums in header files.

15. Consider the Swing API. Which statement is true?
A Swing provides access to all the Microsoft windows API calls
B Swing relies on the operating system for its functionality
C Swing is a lightweight, limited function API
D Swing is largely operating system independent providing a full range of
Graphics User Interface APIs.

19. A Big decimal has a maximum value of approximately?
A 4294967296
B 2^128
C 9*10^4294967296
D 10^32676



Is it A,B,C OR D for each question?

Thanks again :)

What is the maximum value for a big decimal approximately?

You forgot to post your answers with the reasons you chose them.

Consider the method in the line of code below. Which statement is true?
Button. addActionListener (this);

My answer B - because 'this' is what is happening when the button is clicked?

Public class member Exception extends Exception { } and

My answer C - because it will allow typos to be handled?

The keyword super is used to:

My answer D - because it allows you to access data in the base class but you cannot change what is in the base class?

10. The Flow Layout Manager?

My answer C - because it puts objects in sequence, then puts on next line like paragraphing?

11. Consider the Super Class. Which statement is true?

My answer A - because super is not a class - I think it is a keyword?

13. Consider The C++ Enum Type. Which statement is true?

My answer A - because Java did not use to support Enums but now it does for compatibility reasons?

15. Consider the Swing API. Which statement is true?

My answer D - because you can use it on different operating systems and it provides many features.

19. A Big decimal has a maximum value of approximately?

My answer A - because a big decimal consists of an arbitrary precision integer unscaled value and a 32-bit integer scale?


Are these explanations and answers right? thanks

Approximately infinity.

Quote:

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Originally Posted by pbrockway2

Approximately infinity.

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Nah, not even close ;-)

kind regards,

Jos

Thanks for the reply :)

But I have this question i need to answer...

19. A Big decimal has a maximum value of approximately?
A 4294967296
B 2^128
C 9*10^4294967296
D 10^32676

I am not sure which one is correct as I have searched everywhere and I get responses like 'infinity' or 'depends on your computer memory'.
Please help :)

I'd go with C - which is approximately equal to infinity (although not close).

What do the Javadocs say? The Jvm spec? The compiler? The runtime?

In future, don't ask the same question in more than one thread. I've merged the two threads.

db