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Figure 6 - Question 6.
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Answer 6

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Answers

Answer 6

False. This program illustrates incorrect use of the diamond for type inference and will not compile.In Java SE 7 and later, you can replace the type arguments required to invoke the constructor of ageneric class with an empty set of matching angle brackets as long as the compiler can determine,or infer, the type arguments from the context. This pair of angle brackets, is informally calledthe diamond. However, in this case, the diamond is in the wrong location.This results in the errors shown in Figure 7 .

Figure 7 - Answer 6.
Q06.java:18: error: illegal start of type Foo<>varA = ^Q06.java:23: error: illegal start of type Foo<>varB = ^2 errors

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Answer 5

True. This program illustrates type inference. In Java SE 7 and later, you can replace the typearguments required to invoke the constructor of a generic class with an empty set of matching anglebrackets as long as the compiler can determine, or infer, the type arguments from the context.This pair of angle brackets, is informally called the diamond.

Note that the Foo constructor requires two parameters and the types of those parameters arespecified inside the angle brackets.

Also note that the order of the types of the two parametersis swapped between the instantiation of the first and second objects. The program also illustratesautoboxing.

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Answer 4

True. This program illustrates generics without any obvious type inference. This is the style ofprogramming that would have been used prior to the release of Java SE 7.

Note that the Foo constructor requires two parameters and thetypes of those parameters are specified inside the angle brackets.

Also note that the order of the types of the two parameters is swappedbetween the instantiation of the first and second objects. The program also illustrates autoboxing.

Back to Question 4

Answer 3

False. This program illustrates incorrect use of the diamond for type inference and will not compile.In Java SE 7 and later, you can replace the type arguments required to invoke the constructor of ageneric class with an empty set of matching angle brackets as long as the compiler can determine,or infer, the type arguments from the context. This pair of angle brackets, is informally calledthe diamond. However, in this case, the diamond is in the wrong location.Therefore, the program produces the error shown in Figure 8 .

Figure 8 - Answer 3.
Q03.java:26: error: illegal start of type Foo<>var = new Foo<Window>(); ^1 error

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Answer 2

True. This program illustrates bounded parameters along with type inference. In Java SE 7 and later, youcan replace the type arguments required to invoke the constructor of a generic class with an emptyset of matching angle brackets as long as the compiler can determine, or infer, the typearguments from the context. This pair of angle brackets, is informally called the diamond.

Back to Question 2

Answer 1

True. This program illustrates generics with bounded parameters but without any obvious typeinference. This is the style of programming that would have been used prior to the release ofJava SE 7.

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4260r: Review of Type Inference
  • File: Java4260r.htm
  • Published: 10/22/13
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

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
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
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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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