<< Chapter < Page Chapter >> Page >

A switch structure

There is a somewhat more specialized, control structure named switch that can also be used to make decisions in a multiple choice sense under certain fairlyrestrictive conditions.

However, the structure shown in this program can always be used to replace a switch. Therefore, I find that I rarely use the switch structure, opting instead for the more general form of multiple-choicestructure.

Back to Question 10

Answer 9

D. Goodbye World

Explanation 9

An if-else control structure

This program contains a simple if-else control structure.

Behavior of if-else structure

If the expression in the conditional clause returns true, the block of code following the conditional clause is executed, and the block of code followingthe word else is skipped.

If the expression in the conditional clause returns false, the block of code following the conditional clause is skipped, and the block of code following theword else is executed.

This program executes the else block

In this program, the expression in the conditional clause returns false.

Therefore, the block of code following the word else is executed, producing the words Goodbye World on the computer screen.

Can result in very complex structures

While the structure used in this program is relatively simple, it is possible to create very complex control structures by nesting additional if-else structures inside the blocks of code.

Back to Question 9

Answer 8

D. Hello World

Explanation 8

A simple if statement

This program contains a simple if statement that

  • uses a relational expression
  • to return a value of type boolean inside its conditional clause

Tests for x less than y

The relational expression tests to determine if the value of the variable named x is less than the value of the variable named y .

Since the value of x is 5 and the value of y is 6, this relational expression returns true.

Behavior of an if statement

If the expression in the conditional clause returns true, the block of code following the conditional clause is executed

What is a block of code?

A block of code is one or more statements surrounded by matching curly brackets.

For cases like this one where the block includes only one statement, the curly brackets can be omitted. However, I prefer to put them there anyway. Theydon't cause any harm and help me avoid programming errors if I come back later and add more statements to the body of the if statement.

Display the word Hello

In this program, execution of the code in the block causes the print method to be called and the word Hello to be displayed followed by a space, but without a newline following the space.

What if the conditional clause returns false?

If the expression in the conditional clause returns false, the block of code following the conditional clause is bypassed.

(That is not the case in this program.)

After the if statement ...

After the if statement is executed in this program, the println method is called to cause the word World to be displayed on the same line as the word Hello .

Back to Question 8

Answer 7

A. Compiler Error

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
Privacy Information Security Software Version 1.1a
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?