<< Chapter < Page Chapter >> Page >

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.

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

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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
How can I make nanorobot?
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
how can I make nanorobot?
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
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?