Whether or not you realize it, you are way ahead of
yourself in Java for being a novice. I took a Java course
last semester, and interfaces were not introduced.
Interfaces will be introduced and used in the second
course. Below, I will attempt to answer your questions as
well as provide an additional resource for learning Java so
you are not getting ahead of yourself.
The HelloWorldApp had everything in it. It didn't need a
interface, why do we need to make a separate interface for
all our other classes?
You do not need to make an interface for each class.
This is where you skimmed too far ahead in the tutorial.
Why do we have to create an interface when the class
already has the same code in it?
Interfaces are for designing larger, complex
applications. Please do not worry about them at this stage.
Do you save all classes as a .java file then use javac to
compile it into a .class file?
Yes, all classes can be in a single .java file, or you
can have a .java file for each class.
Hello,
I finally had time to go past the HelloWorldApp in the
tutorial. :D
Now I'm trying to create my own classes then run them
through my interface...
But I'm a little confused:
The HelloWorldApp had everything in it. It didn't need
a interface, why do we need to make a separate interface
for all our other classes?
Why do we have to create an interface when the class
already has the same code in it?
Do you save all classes as a .java file then use javac
to compile it into a .class file?
What do you save interfaces as?
I created a class for my heater:
/** creates the class for heater which has
temperature, speed and onOff
*/
class Heater }
int temperature = 0
int speed = 0
int turned = on
voide changeTemprature(int newValue) {
temperature = newValue;
}
voide speedUp(int increment) {
Speed = speed + increment;
}
voide slowDown(int decrement) {
Speed = speed - decrement;
}
voide turnOn() {
Turned = on;
}
voide turnOff() {
Turned = off;
}
voide printStates() }
System.out.println("temprature:"+temprature+"
speed:"+speed+" turned:"+turned);
}
}
Where do I put the lines like:
public static void main(String[] args)
and
System.out.println
?
Also do I have the right idea with the word after void
is the word I type to turnOn the heater?
And the word after (int is the word that could be what
ever I want it to be, it just needs to be the same below?)
Example:
voide slowDown(int pizza) {
Speed = speed - pizza;
}
?
If you have any question, the interface for the heater
is:
interface Heater }
voide changeTemprature(int newValue);
voide speedUp(int increment);
voide slowDown(int decrement);
voide turnOn();
voide turnOff();
}
Sorry, I didn't see answers to these questions in the
tutorials and I need to know this to do anything!
Thank you,
Brandon Keith Biggs
Sent: Thursday, July 07, 2011 6:50 AM
Subject: RE: Best Java Guides for a Newby?
That’s not learning a language Ken, that’s
learning an SDK, which implies one already knows how
to use the language.
I think you should start off with text as well,
so that six months later you aren’t asking basic
questions like why doesn’t this class run, because you
never had to put a mian method in it since Eclipse
always did that for you, etc. etc.
Of course, that implies that you actually want to
learn the fundamentals of the language, and not just
code.
Take care,
Sina
I have to disagree with this. There is nothing
like using eclipse when you’re learning a language.
Let’s say you are in Android and need to make an
Application. Ok so you start it up and there is an
Activity class. You’re in your text editor what do
you do?
You go out on line or into a document and try to
read up on all the possible functions you can run in
an activity. Not bad but why not make it quicker.
Just arrow to your myactivity and use the source
menu and go down and select override members. Then
you can arrow through the list of things you have that
you can do in that class. You check a few and tab
down and hit ok. Now you have 6 stub functions that
work perfect. You then go down to the keydown
function that you just added and arrow over keyEvent
and select help it tells you all the functions
Eclipse and Visual studio are not just
environments but they are great learning tools. Not
to mention learning the environment now with an easy
program will speed up both development of a harder
program but it also teaches you how to download other
peoples projects and get them running.
Heck for that matter if you don’t use eclipse you
have to learn another way to compile your project.
Which normally means you start compiling at the
command line with javac. That sounds easy but how
many of you have tried this and ran into the java path
problems. That is not something you want to get a new
user into right away. Then if you want to get real
bold and use ant as a new programmer you better have a
lot of antacid.
So I guess in short I just wanted to say sure
Eclipse is a big pig but the gains for a new coder is
pretty high if you learn to use it. Now if you’re on
a Mac sorry to hear it while I like Mac I have not
been impressed with the amount of work I had to go
through to get Eclipse set up. I use it on both Mac
and Windows but I will tell you there is nothing like
Eclipse and Jaws 12. I use no scripts and do just
fine.
Ken
Hi Brandon,
This is my opinion, so take with a grain of salt.
Right at the beginning with Java, I feel that you
should use a text editor. Personally, I prefer
EdSharp, but there are lots of good ones. Learn to
use the command line tools that come with the Java
Development Kit. After you have written some programs,
and you know what's going on with basic Java, start to
use something like Eclipse or Net Beans. I have no
experience with SodBeans, but I understand that that
package for NetBeans is making a big difference in
NetBeans accessibility. So scrap fancy editors for
now.
Jim
Thanks and I started reading those, the only problem
is I use Eclipse and these talk about the Netbeans IDE
which I think it is inaccessible.
My big question is: What are all the differences in
the different things you can create with the new menu
in Eclipse? There are like projects, classes, Java
projects and all kinds of other things that aren't
really talked about with Java.
Sent: Wednesday, July
06, 2011 9:36 AM
Subject: RE: Best Java
Guides for a Newby?
Hi,
I think that, as with many things, this is one of
those things that can be different, depending on the
learning style and knowledge of the person.
Speaking just for myself, I get more out of
tutorial style books, when I'm learning a language. I
tend to freeze up at reference type material that is
full of code and short on words, but that's my taste.
According to me, you will probably do well with
the nutshell books, if you already know lots of
programming concepts and want to see how certain
things are done in Java. On the other hand, you may do
better if you have little programming experience by
looking at the Java Tutorial, which takes things a
concept at a time and explains them with lots of words
and examples. You can see that at
http://download.oracle.com/javase/tutorial/reallybigindex.html.
Thanks.
Jim
I would recommend if you have a subscription to
bookshare.org, that you download a copy of "Java in
a Nutshell". It is a nice summary of features with
some examples. I was going to read "Thinking in
Java, 4th edition", which I forked $25 for online,
but got a package that I cann't display on my
system. I have been unable to read more than the
preface, and most the time, the html just freezes
things. So I'm pitching it. A shame as it sounds
like a useful guide to using java the way it is
meant to be used.
Good luck and happy hacking.
----- Original Message -----
Sent: Wednesday, July 06,
2011 6:44 AM
Subject: Re: Best Java
Guides for a Newby?
Hello Brandon,
Do you have any form of IM or perhaps skype? I
would like to help you but it's easier for me to
recommend something if i know a bit more about your
background.
Florian
On Jul 6, 2011, at 8:04 AM, Brandon Keith
(Biggs) wrote:
I'm new to programming, (I have just made it
past "Hello World") and am looking for some
guides.
I would like to learn Java, but I'm not quite
sure where to start. I downloaded the 500 or
so documents from the "Java Documentation" at:
as well as reading all the tutorials on
Eclipse and Java.
I've installed the SDK 1.6 and Eclipse, is
there anything else I need? I see there are
Jaws scripts for Eclipse, where do I insert
those?
I arrowed through the 500 documents dealing
with Java and found:
Java Tutorial 3rd Edition, a short course on
the basics
but I see it was written in 2001 and only
deals with Java 1.3 and Windows 2000 and
before. Is this something I should read? What
books best describe the language in an
exciting and useful format? I'm wanting to
eventually program for Android, but I think
that is stepping a little ahead of myself.
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