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Answer 11

True. Updates made in Java v1.7 eliminated the requirement to insert the name of a type in those angle brackets in order to make the compiler happy.

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Answer 10

One solution is to add the generic syntax shown in the class named A10 in Listing 9 below. This will cause the program to compile and execute successfully producing an output similar to that shown in Figure 8 below.

Listing 9 - Answer 10.
/*File A10.java ************************************************/import java.util.*; public class A10{ArrayList<Date>var1 = new ArrayList<Date>(); void runIt(){var1.add(new Date()); //Note the required cast in the following// statement. System.out.println((var1.get(0)).getTime()); }//runItpublic static void main(String[]args){ new A10().runIt();}//end main}//end class A10 //=============================================//
Figure 8 - Answer 10.
1378058466149

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Answer 9

False: The program produces the runtime error shown in Figure 9 below. The (Date) cast is applied to the contents of the element at index 1. However, thatelement contains a reference to an object of type String.

Figure 9 - Answer 9.
Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Dateat Q09.runIt(Q09.java:15) at Q09.main(Q09.java:22)

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Answer 8

The program must be updated to include the cast operator (Date) shown in Listing 10 below.

Listing 10 - Answer 8.
/*File Q08.java ************************************************/import java.util.*; public class Q08{ArrayList var1 = new ArrayList();void runIt(){ var1.add(new Date());//Note the required cast in the following // statement.System.out.println( ((Date)var1.get(0)).getTime());}//runIt public static void main(String[]args){ new Q08().runIt();}//end main}//end class Q08 //=============================================//

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Answer 7

False: This program produces the compiler error shown in Figure 10 below.

Figure 10 - Answer 7.
Q07.java:17: error: cannot find symbol (var1.get(0)).getTime());^ symbol: method getTime()location: class Object Note: Q07.java uses unchecked or unsafe operations.Note: Recompile with -Xlint:unchecked for details. 1 error

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Answer 6

B. A warning

The compiler output is shown in Figure 11 below:

Figure 11 - Answer 6.
Q02.java:13: warning: [unchecked] unchecked call to add(E) as a member of the rawtype ArrayList var1.add(new Date());^ where E is a type-variable:E extends Object declared in class ArrayList 1 warning

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Answer 5

False. Two notes are displayed. However, the messages produced by the Java v1.7 compiler in this cases are neither error messages nor warnings. Instead they are simply notes. The notes provideinstructions on how to recompile and get more information regarding a potential problem.

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Answer 4

False. The tentacles of generics reach into many different areas of Java in very complex ways including:

  • Generic methods
  • Generic classes
  • Raw types
  • Wildcards
  • Generics and inheritance

Back to Question 4

Answer 3

B. Compile-time type safety

Back to Question 3

Answer 2

False: An attempt to compile the program using the Java v1.7 compiler produces an output similar to that shown in Figure 12 below.

Figure 12 - Answer 2.
Note: Q02.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details.

Back to Question 2

Answer 1

False. The Collections framework was not new in Java v1.5. It was available long before version 1.5 was released.

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Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4210r Review
  • File: Java4210r.htm
  • Published: 09/01/13
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

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
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
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
How can I make nanorobot?
Lily
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
how can I make nanorobot?
Lily
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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