# 7.13 Ap0130: self-assessment, comparing objects, packages, import  (Page 4/9)

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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.

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.

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));```

are nano particles real
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
how did you get the value of 2000N.What calculations are needed to arrive at it
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