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Back to Question 10

Answer 9

B. Runtime Error

Explanation 9

A setup

If you feel like you've been had, chances are you have been had. The purpose for Question 8 was to set you up for this question.

Division by zero for integer types

This program deals with the process of dividing by zero for int types. The code in the following fragment divides the int value 1 by the int value 0.

void doIt(){ System.out.println(1/0);}//end doIt()

Not the same as double divide by zero

However, unlike with type double , this process doesn't return a very large value and continue running. Rather, for type int , attempting to divide by zero will result in a runtime error of type ArithmeticException that looks something like the following under JDK 1.3:

java.lang.ArithmeticException: / by zero at Worker.doIt(Ap149.java:20)at Ap149.main(Ap149.java:14)

An exercise for the student

I won't attempt to explain the difference in behavior for essentially the same problem between type int and type double . As the old saying goes, I'll leave that as an exercise for the student.

Back to Question 9

Answer 8

C. Infinity

Explanation 8

A double divide by zero operation

This program deals with the process of dividing by zero for floating values of type double .

The following code fragment attempts to divide the double value 1.0 by the double value 0.

void doIt(){ System.out.println(1.0/0);}//end doIt()

The program runs successfully, producing the output Infinity .

What is Infinity?

Suffice it to say that Infinity is a very large number.

(Any value divided by zero is a very large number.)

At this point, I'm not going to explain it further. If you are interested in learning what you can do with Infinity , see the language specifications.

Back to Question 8

Answer 7

B. Runtime Error

Explanation 7

This program illustrates an IndexOutOfBounds exception.

Instantiate and populate an ArrayList object

By now, you will be familiar with the kind of container object that you get when you instantiate the ArrayList class.

The code in the following fragment instantiates such a container, having aninitial capacity of one element.

Then it adds two elements to the container. Each element is a reference to an object of the class String .

void doIt(){ ArrayList ref = null;ref = new ArrayList(1); ref.add("ABC ");ref.add("DEF ");

Increase capacity automatically

Because two elements were successfully added to a container having an initial capacity of only one element, the container was forced to increase its capacityautomatically.

Following execution of the code in the above fragment, String object references were stored at index locations 0 and 1 in the ArrayList object.

Get reference at index location 2

The next fragment attempts to use the get method to fetch an element from the container at index value 2.

Index values in an ArrayList object begin with zero. Therefore, since only two elements were added to the container in the earlierfragment, there is no element at index value 2.

System.out.println( (String)ref.get(0) +(String)ref.get(1) + (String)ref.get(2));

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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