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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.

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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

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Answer 3

B. Compile-time type safety

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

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Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
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..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
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
ya I also want to know the raman spectra
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.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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.
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