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If you wrote down the following for the program output, you already understand most of the material covered in this module and you can probably skipthis module and move on to the next module.

Collection data Joe Bill Tom JOE BILL TOMRaw array data Joe Bill Tom JOE BILL TOMNatural order sorted array data BILL Bill JOE Joe TOM TomCustom order sorted array data Tom TOM Joe JOE Bill BILLCollection data Joe Bill Tom JOE BILL TOM

If you didn't write down the correct output for the program in Listing 1 , you should probably continue with your study of this module.

Similar to previous programs

Although this program is somewhat more complex, the overall structure of this program is similar to programs that I have discussed in previous modules.Therefore, I will concentrate on those aspects of this program that differentiate it from the programs in previous modules.

A new Vector object

The code in Listing 2 instantiates a new object of the Vector class and stores a reference to that object in the variable named ref .

Listing 2 . A new Vector object.
ref = new Vector();

The Vector class was part of Java long before the Collections Framework was released. However, with the release of the Collections Framework,the Vector class was upgraded to implement the Collection interface and the List interface.

A Vector is a List

Therefore, a Vector is a List , and adheres to the various contracts of the List interface. For example, since it is not a Set , it doesn't prohibit duplicate elements. Because it is a List , it is an ordered collection. The position of each element in the collection is determined by a numeric index associated with the element and is independent ofthe value of the element.

The fillIt method

As has been the case in several of the programs in previous modules, the code in Listing 3 passes the Vector object's reference to a method named fillIt where the Vector is populated with the names of several people.

Listing 3 . Call the fillIt method.
Populator.fillIt(ref);

The code for the fillIt method is shown in Listing 4 . As you can see, the names were added to the collection in no particular order relative to theirvalues. (The add method for the Vector class simply adds each new element to the end of the list.)

Listing 4 . The fillIt method.
class Populator{ public static void fillIt(Collection ref){ ref.add("Joe");ref.add("Bill"); ref.add("Tom");ref.add("JOE"); ref.add("BILL");ref.add("TOM"); }//end fillIt()}//end class Populator

Iteration on a Vector

When an iterator is used to traverse the elements in a Vector collection, the elements are delivered by the iterator in ascending index order,beginning with the element stored at index 0.

The code in Listing 5 gets and uses an iterator to display the contents of the populated collection.

Listing 5 . Iteration on a Vector.
iter = ref.iterator(); System.out.println("Collection data");while(iter.hasNext()){ System.out.print(iter.next() + " ");}//end while loop

The output

The code in Listing 5 produces the following output:

Questions & Answers

what are the products of Nano chemistry?
Maira Reply
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
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
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
what is the stm
Brian Reply
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?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
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 ?
Bob Reply
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?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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