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Part of a self-assessment test designed to help you determine how much you know about arrays in Java.

Table of contents

Preface

This module is part of a self-assessment test designed to help you determine how much you know about object-orientedprogramming using Java.

The test consists of a series of questions with answers and explanations of the answers.

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back.

I recommend that you open another copy of this document in a separate browser window and use the links to under Listings to easily find and view the listings while you are reading about them.

Questions

Question 1 .

What output is produced by the program shown in Listing 1 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. I'm OK
  • D. None of the above
Listing 1 . Listing for Question 1.
public class Ap064{ public static void main(String args[]){new Worker().doArrays(); }//end main()}//end class definition class Worker{public void doArrays(){ double[]A = new double[2];A[0] = 1.0;A[1] = 2.0;Object B = A;System.out.println("I'm OK"); }//end doArrays()}// end class

Answer and Explanation

Question 2

What output is produced by the program shown in Listing 2 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 1.0 2.0
  • D. None of the above.
Listing 2 . Listing for Question 2.
public class Ap065{ public static void main(String args[]){new Worker().doArrays(); }//end main()}//end class definition class Worker{public void doArrays(){ double[]A = new double[2];A[0] = 1.0;A[1] = 2.0;Object B = A;System.out.println( B[0]+ " " + B[1]);}//end doArrays() }// end class

Answer and Explanation

Question 3

What output is produced by the program shown in Listing 3 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 1.0 2.0
  • D. None of the above.
Listing 3 . Listing for Question 3.
public class Ap066{ public static void main(String args[]){new Worker().doArrays(); }//end main()}//end class definition class Worker{public void doArrays(){ double[]A = new double[2];A[0] = 1.0;A[1] = 2.0;Object B = A;double C = (double)B; System.out.println(C[0] + " " + C[1]); }//end doArrays()}// end class

Answer and Explanation

Question 4

What output is produced by the program shown in Listing 4 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 1.0 2.0
  • D. None of the above.
Listing 4 . Listing for Question 4.
public class Ap067{ public static void main(String args[]){new Worker().doArrays(); }//end main()}//end class definition class Worker{public void doArrays(){ double[]A = new double[2];A[0] = 1.0;A[1] = 2.0;Object B = A;double[] C = (double[])B; System.out.println(C[0] + " " + C[1]); }//end doArrays()}// end class

Answer and Explanation

Question 5

What output is produced by the program shown in Listing 5 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. 1.0 2.0
  • D. None of the above.
Listing 5 . Listing for Question 5.
public class Ap068{ public static void main(String args[]){new Worker().doArrays(); }//end main()}//end class definition class Worker{public void doArrays(){ double[]A = new double[2];A[0] = 1.0;A[1] = 2.0;Object B = A;String[] C = (String[])B; System.out.println(C[0] + " " + C[1]); }//end doArrays()}// end class

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
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
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
Berger describes sociologists as concerned with
Mueller Reply
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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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