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Explanation 7

Not the same as C and C++

Unlike C and C++, which can use an integer numeric expression in the conditional clause of an if statement, Java requires the conditional clause of an if statement to contain an expression that will return a boolean result.

Bad conditional expression

That is not the case in this program, and the following compiler error occurs under JDK 1.3:

Ap031.java:13: incompatible types found : intrequired: boolean if(x - y){

Back to Question 7

Answer 6

D. 6 4 9.3 7.300000000000001

Explanation 6

Postfix increment and decrement operators

This program illustrates the use of the increment (++) and decrement (--) operators in their postfix form.

Behavior of increment operator

Given a variable x , the following two statements are equivalent:

x++; x = x + 1;

Behavior of decrement operator

Also, the following two statements are equivalent:

x--; x = x - 1;

Prefix and postfix forms available

These operators have both a prefix form and a postfix form.

Can be fairly complex

It is possible to construct some fairly complex scenarios when using these operators and combining them into expressions.

In these modules ...

In this group of self-assessment modules, the increment and decrement operators will primarily be used to update control variables in loops.

Inaccurate results

Regarding the program output, you will note that there is a little arithmetic inaccuracy when this program is executed using JDK 1.3. (The same is still true with JDK version 1.7.)

Ideally, the output value 7.300000000000001 should simply be 7.3 without the very small additional fractional part, but that sort of thing often happens whenusing floating types.

Back to Question 6

Answer 5

A. Compiler Error

Explanation 5

Cannot use>with reference variables

The only relational operator that can be applied to reference variables is the == operator.

As discussed in the previous questions, even then it can only be used to determine if two reference variables refer to the same object.

This program produces the following compiler error under JDK 1.3:

Ap029.java:14: operator>cannot be applied to Dummy,Dummy System.out.println(x>y);

Back to Question 5

Answer 4

E. true true

Explanation 4

Two references to the same object

In this case, the reference variables named x and y both refer to the same object. Therefore, when tested for equality, using either the ==operator or the default equals method, the result is true.

Back to Question 4

Answer 3

D. false

Explanation 3

Read question 2

In case you skipped it, you need to read the explanation for the answer to Question 2 before reading this explanation.

Objects appear to be equal

These two objects are of the same type and contain the same values. Whyare they reported as not being equal?

Did not override the equals method

When I defined the class named Dummy used in the programs for Question 2 and Question 3 , I did not override the method named equals .

Therefore, my class named Dummy simply inherited the default version of the method named equals that is defined in the class named Object .

Questions & Answers

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
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
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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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