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This lesson discusses the ramifications of types short, long, byte, char, and float not being included in the Java subset for the AP Computer Science A exam.

Table of contents

Preface

General

This tutorial lesson is part of a series of lessons dedicated to the AP Computer Science A Exam .

The purpose of the series is to help you to better understand the Java Subset specifications for the Advanced Placement Computer Science A exam.

For example, if you access the AP Computer Science Course Description and scroll down to Appendix A titled AP Computer Science Java Subset , you will find the following specification :

1. The primitive types int, double, and boolean are part of the AP Java subset.

The other primitive types short, long, byte, char, and float are not in the subset.

In particular, students need not be aware that strings are composed of char values. Introducing char does not increase the expressiveness of the subset.

Students already need to understand string concatenation, String.substring, and String.equals. (This is a requirement in a different part of the course description .)

Not introducing char avoids complexities with the char/int conversions and confusion between "x" and 'x'.

(Note that I inserted some explanatory text in parentheses and also inserted some line breaks for clarity. Also note that this is the wordingthat appeared on the website on March 1, 2011. It may change over time.)

May be clear to some, but not to others

While some students and their homeschool parents may know exactly what is meant by this text, others may not. Therefore, my objective will be to elaborateon and attempt to clarify such specifications from a technical viewpoint to help those students and their parents get a better understanding of where they needto concentrate their efforts.

Viewing tip

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

  • Figure 1 . Calculating the number of cans of paint to purchase.
  • Figure 2 . Value ranges for integer types.
  • Figure 3 . Representing a large range of values.
  • Figure 4 . Value range for floating-point types.

Supplemental material

I recommend that you also study the other lessons in my extensive collection of online programming tutorials. You will find a consolidated index at www.DickBaldwin.com .

Discussion

Java, C++, C#, and some other modern programming languages make heavy use of a concept that we refer to as type, or data type. We refer to those languages as strongly typed or type-sensitive languages.

Not all languages are type-sensitive languages. In particular, some languages hide the concept of type from the programmer and automatically deal with type issues behind the scenes.

Different types of data

Type-sensitive programming languages deal explicitly with different types of data. Some data types involve whole-numbers only (no fractional parts are allowed) . We generally refer to these as integer types.

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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
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
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Ap computer science a, clarification of the java subset. OpenStax CNX. Oct 03, 2015 Download for free at https://legacy.cnx.org/content/col11279/1.5
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