<< Chapter < Page Chapter >> Page >

Sorting the array into natural order

The code in Listing 8 is also new to this module. This code uses one of the overloaded sort methods of the Arrays class to sort the contents of the array into natural order .

Listing 8 . Sorting the array into natural order.
Arrays.sort(array);

Here is part of what Oracle has to say about the Arrays class:

"This class contains various methods for manipulating arrays (such as sorting and searching)."

The class contains many overloaded versions of the sort method. Here is part of what Oracle has to say about the version of the sort method used in Listing 8 above:

"Sorts the specified array of objects into ascending order, according to the natural ordering of its elements. All elements in the array mustimplement the Comparable interface."

The Comparable interface and polymorphic behavior

Although the declared type of the array is Object , the array actually contains references to String objects.

The String class implements the Comparable interface. It is not necessary to cast the array to type String before passing it to the Sort method. (The Sort method declares the incoming parameter as type Object .)

The sort method treats the array elements as type Comparable and uses the compareTo method declared in that interface to perform any necessary comparisons required to carry out the sorting operation.

This is another example of the usefulness of polymorphism as implemented through the use of the Java interface. (The Comparable interface and the compareTo method declared in that interface were discussed in detail in an earlier module.)

Display the sorted array data

The code in Listing 9 displays the contents of the array after those contents are sorted into natural order by the sort method in Listing 8 above.

Listing 9 . Display the sorted array data.
System.out.println("Natural order sorted " + "array data");display(array);

The output produced by Listing 9 above is:

Natural order sorted array data BILL Bill JOE Joe TOM Tom

The natural order for String objects

I discussed the concept of natural ordering in a previous module with particular emphasis of the natural order for strings. You will recognize that the strings shown in the above output have been sorted into natural order according to the definition of the compareTo method of the String class.

Sort the array with a Comparator

The code in Listing 10 is also new to this module. This code uses a different version of the overloaded sort method of the Arrays class to sort the array using the rules defined in the compare method of a Comparator object (passed as a parameter to the sort method).

Listing 10 . Sort the array with a Comparator.
Arrays.sort(array, new TheComparator());

What does Oracle have to say about this?

Here is part of what Oracle has to say about this version of the sort method of the Arrays class:

"Sorts the specified array of objects according to the order induced by the specified comparator. All elements in the array must be mutuallycomparable by the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the array)."

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
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
Google
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
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
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?

Ask