integers and arrays in Java - how?

[Robert Baer]

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinates of the mouse.
What i would like to do:
1) Get X and Y mouse coordinates into a variable that i can do real math on.
So far, i can do math on the values "read" and that result goes into
a "variable" that is useful *only* for display.
If i try "int" in that math, the values are then zero for everything
- even those where i do no calculation.
2) Use the calculated integer values as an index to a table or array.
It is acceptable to use an HTML "table" as the source for the lookup;
W(CalcFromX) and P(CalcFromX) would be the resulting values to be
displayed on the screen somewhere.

Can this be done, and eXactly how?

[Lasse Reichstein Nielsen]

Robert Baer <ro********@ear thlink.net> writes:

Thomas 'PointedEars' Lahn wrote:

You could have RTFM first, and even if you had not, you could have
read and followed <URL:http://jibbering.com/faq/#FAQ4_43> before
you posted anything.

** ?RTFM? what is that? And how would a complete newbie know where to
** look or know anything about that URL?

This URL is a link to the FAQ of this newsgroup. It is posted twice a
week in the group, so anybody following the group for more than four
days would have been able to see it. Several regualars of the group
also have links to this FAQ in their signatures.
People new to Usenet wouldn't know that you are recommended to follow
a group for at least that long before starting to write, or that
groups often have FAQs. The tradiatiaion way of teaching them this is
to answer their questions by a reference to the FAQ. That's what it
is there for.

/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Thomas 'PointedEars' Lahn]

Robert Baer wrote:

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:

Randy Webb wrote:
Robert Baer said the following on 3/31/2006 6:28 AM:
You had trouble because you were using, or attempting to use, a feature
that is not part of the language. Not because of a feature that might
be in a future release of the language unless you were reading a draft
copy of JavaScript2.0 in which case you should have known it wasn't in
use yet.
I had no idea that the "int" "feature" was not a part of the language. AFAIK, it is merely not part of a language version that is implemented
_in Web browsers_. You could have RTFM first, and even if you had not,
you could have read and followed <URL:http://jibbering.com/faq/#FAQ4_43>
before you posted anything.

** ?RTFM? what is that?

Read The Fine/F***ing Manual. STFW (Search The Fine/F***ing Web).

Using any prefixes for your replies is unwanted. Attribution lines and
Automatically inserted quotation prefixes ("> ") make it clear what is
your text and what is text quoted by you. Quotation and reply should be
delimited by an empty line to ease reading.
And how would a complete newbie know where to look or know anything about
that URL?

See Lasse's followup.

J(ava)Script implemented client-side *has* type conversion, both explicit
and implicit.

** Well, i would like to learn about how that can be done.
Any suggestions, since "int" or "integer" does not work?

That depends on what you are actually looking for. If it is just typing
values, forget about that in these loosely-typed languages. Any numeric
literal is of type `number' (form control values are string values, so if
you want to do calculation with them, explicit conversion to `number' is
wise).

If it is explicit type conversion, try the unary `+' for all types of
operands, parseInt(...) or parseFloat(...) for string-type operands.
Note that `+' is the most efficient way but not fully backwards compatible,
and that parseInt(...) recognizes prefixes as indicators for a number base
(`0x' for 16; `0' for 8 in some implementations ), so you should specify
the base as second operand if you want it to interpret the string in a
certain way. IIRC all of this is described in the FAQ.

... Oh well, apparently the latter. The first thing you have to
understand is that JavaScript is not Java. That is *beginner's
knowledge*, you know.

** Well, i *now* know that, but was not aware of the distinction earlier.
Incompetent? Well,concerning Java Script, absolutely *yes*, hence the
dumb questions.

Read it from my fingertips: *There* *is* *no* "*Java* *Script*"!

Would such a thing help me?

If you would develop using a language that implements it, such as
Microsoft JScript.NET (AFAIK server-side only), it certainly would.

** Only interested i client side - *unless* - you know that it would be
easier to do a server side implimentation and can tell me how i get
someone's server to do whatever tricks are needed...

That depends on what you are actually looking for. There are image maps
that do not need client-side scripting, and submit the pointer coordinates
relative to the image position to the server; that information could be
evaluated with a server-side script. If you don't mean images, server-side
script cannot be of help obtaining that information (but maybe processing
it).
PointedEars

[Thomas 'PointedEars' Lahn]

Robert Baer wrote:

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:

It seems i am using Java Script, [...]
Yes, it only seems to be so. There is no "Java Script".
See my other followup.
[...]

Well, i am using some kind of Java code of some sort...

Java is off topic here.

BTW: Signatures are not to be quoted, unless there is an explicit reference
in the reply.
And you mentioned Java Script 2.0
,-[news:19******** ********@Pointe dEars.de]
|
| Not quite true. There is an `int' type, and variables can be strictly
| typed, in JavaScript 2.0. However, that is not implemented in a browser
^^^^^^^^^^
| yet.
so one might conclude that either it does exist or that someone is a
liar somewhere...

It does not, and you are.
Score adjusted

PointedEars

[Randy Webb]

Robert Baer said the following on 4/1/2006 4:00 AM:

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:

It seems i am using Java Script, [...]

Yes, it only seems to be so. There is no "Java Script".
See my other followup.
PointedEars

Well, i am using some kind of Java code of some sort...

You are using Javascript, not Java Script, and Thomas was being
childishly immature and pedantic about it.
And you mentioned Java Script 2.0 so one might conclude that either it
does exist or that someone is a liar somewhere...

It exists - in theory.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Randy Webb]

Thomas 'PointedEars' Lahn said the following on 4/1/2006 7:28 AM:

<snip>

BTW: Signatures are not to be quoted,

Oh but you do not have a "signature" my boy. Do you actually need me to
post references to the numerous articles where you claim that you don't?

Or, is it an improperly delimited signature since it does not start with
dash dash space?

Make up your mind son, you can't have your cake and eat it too.

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[VK]

Robert Baer wrote:

Robert Baer wrote:

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinates of the mouse.
OK, you'll be helped if you promise _stop_ calling JavaScript as "Java"
or "Java Script". You don't say "Linux" while talking about Windows, do
you? And you don't say that your browser is called "Inter Net
Ex-Plorer", do you?

So: the language you are trying to use is called JavaScript - 10
characters without space. The variant of this language implemented in
Internet Explorer is called JScript - 7 characters without space.
Collectively it is reffered as "JavaScript/JScript programming". To
save time and space it is often said just "script": "my script doesn't
work" etc. - if it is clear by context what your are talking about
JavaScript/JScript programming.

What i would like to do:
1) Get X and Y mouse coordinates into a variable that i can do real math
on.

You cannot do real math without using additional libraries and highly
resource expensive algorithms. In the normal circumstances you are
limited by machine math which may be identical, close or far away from
the real math - depending on values and operations. This is true for
JavaScript (10 chars no space - remember? ;-) as well as for Java, C,
C++, C# and any other language for PC (Personal Computer). See for
instance:-
<http://www.jibbering.c om/faq/#FAQ4_6> and
<http://www.jibbering.c om/faq/#FAQ4_7>

The code you posted is adjusted for NN4.x (1998-99) Empires raised and
falled since then :-)

Here is the HTML Strict compliant code for current generation of
browsers. Now if you tell what kind of math do you want to do with
mouse coords, one could suggest a proper way.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN"
"http://www.w3.org/TR/html401/strict.dtd">
<html>
<head>
<title>test 024</title>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<style type="text/css">
html {
margin: 0px 0px;
padding: 0px 0px}

body {
margin: 10px 10px;
padding: 0px 0px;
font: 1em Verdana, sans-serif;
color: #000000;
background-color: #FFFFFF}

form {
margin: 10px 10px;
padding: 5px 5px;
border: thin outset;
background-color: #EEEEEE}

form fieldset {
margin: 10px 10px;
padding: 10px 10px}

form fieldset legend {
margin: 0px 0px;
padding: 5px 5px;
cursor: default;
font-weight: bold}

form fieldset label {
float: left;
clear: left;
width: 20ex;
margin: 5px 0px;
padding: 0px 0px;
text-align: right}

form fieldset label:first-letter {
text-decoration: underline}

form fieldset input {
float: left;
width: 20ex;
margin: 5px 0px;
padding: auto auto;
font: 1em Verdana, sans-serif}

form fieldset button {
float: left;
margin: auto 5px;
padding: auto auto;
font: 1em Verdana, sans-serif}

form fieldset button:first-letter {
text-decoration: underline}
</style>

<script type="text/javascript">
function init() {
if ('undefined' == typeof mmX) {
mmX = document.forms['frm01'].elements['mmX'];
mmY = document.forms['frm01'].elements['mmY'];
}
W3 = ('undefined' != typeof document.body.a ddEventListener );
IE = ('undefined' != typeof document.body.a ttachEvent);
}

function start() {
if (W3) {
document.body.a ddEventListener ('mousemove',sh owCoords,true);
}
else if (IE) {
document.body.a ttachEvent('onm ousemove',showC oords);
}
else {
/*NOP*/
}
}

function stop() {
if (W3) {
document.body.r emoveEventListe ner('mousemove' ,showCoords,tru e);
}
else if (IE) {
document.body.d etachEvent('onm ousemove',showC oords);
}
else {
/*NOP*/
}
}

function showCoords(evt) {
var e = evt || event;
mmX.value = e.clientX;
mmY.value = e.clientY;
}

window.onload = init;
</script>

</head>

<body>
<!-- Pretty-print is adjusted to the "phantom nodes" issue -->
<form name="frm01" method="post" action=""
<fieldset><leg end>Mouse Coords</legend
<label for="mmX">X Coord:</label
<input type="text" name="mmX" id="mmX" accesskey="x">< br<label for="mmY">Y Coord:</label
<input type="text" name="mmY" id="mmY" accesskey="y"></fieldset
<fieldset><leg end>Controls</legend
<button type="button" accesskey="w" onClick="start( )">Watch</button
<button type="button" accesskey="u" onClick="stop() ">Unwatch</button></fieldset</form>

</body>
</html>

[Tony]

VK wrote:

Robert Baer wrote:

I used Google and found some references for integer in Java.
But "int" not only does not work, it also prevents reading X and Y
coordinate s of the mouse.

OK, you'll be helped if you promise _stop_ calling JavaScript as "Java"
or "Java Script". You don't say "Linux" while talking about Windows, do
you? And you don't say that your browser is called "Inter Net
Ex-Plorer", do you?

But I did like his calling it "Infuriatin g Exasperator"

[VK]

Tony wrote:

VK wrote:

And you don't say that your browser is called "Inter Net
Ex-Plorer", do you?

But I did like his calling it "Infuriatin g Exasperator"

In the context of the given topic the OP's source of frustration is not
clear at all. "Exasperato r" because it doesn't support NN4 event
handling mechanics? No one modern browser does it including Firefox.

Or because JScript doesn't have strict type declarations like int, long
or float? AFAIK it is common for all current implementations *in use* -
except JScript.NET (JScript 7.0).

[Robert Baer]

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:

Randy Webb wrote:

>Robert Baer said the following on 3/31/2006 6:28 AM:
>You had trouble because you were using, or attempting to use, a feature
>that is not part of the language. Not because of a feature that might
>be in a future release of the language unless you were reading a draft
>copy of JavaScript2.0 in which case you should have known it wasn't in
>use yet.

I had no idea that the "int" "feature" was not a part of the language.

AFAIK, it is merely not part of a language version that is implemented
_in Web browsers_. You could have RTFM first, and even if you had not,
you could have read and followed <URL:http://jibbering.com/faq/#FAQ4_43>
before you posted anything.

** ?RTFM? what is that?

Read The Fine/F***ing Manual. STFW (Search The Fine/F***ing Web).

Using any prefixes for your replies is unwanted. Attribution lines and
Automatically inserted quotation prefixes ("> ") make it clear what is
your text and what is text quoted by you. Quotation and reply should be
delimited by an empty line to ease reading.

And how would a complete newbie know where to look or know anything about
that URL?

See Lasse's followup.

J(ava)Scri pt implemented client-side *has* type conversion, both explicit
and implicit.

** Well, i would like to learn about how that can be done.
Any suggestions, since "int" or "integer" does not work?

That depends on what you are actually looking for. If it is just typing
values, forget about that in these loosely-typed languages. Any numeric
literal is of type `number' (form control values are string values, so if
you want to do calculation with them, explicit conversion to `number' is
wise).

If it is explicit type conversion, try the unary `+' for all types of
operands, parseInt(...) or parseFloat(...) for string-type operands.
Note that `+' is the most efficient way but not fully backwards compatible,
and that parseInt(...) recognizes prefixes as indicators for a number base
(`0x' for 16; `0' for 8 in some implementations ), so you should specify
the base as second operand if you want it to interpret the string in a
certain way. IIRC all of this is described in the FAQ.

... Oh well, apparently the latter. The first thing you have to
understand is that JavaScript is not Java. That is *beginner's
knowledge* , you know.

** Well, i *now* know that, but was not aware of the distinction earlier.
Incompetent? Well,concerning Java Script, absolutely *yes*, hence the
dumb questions.

Read it from my fingertips: *There* *is* *no* "*Java* *Script*"!

Would such a thing help me?

If you would develop using a language that implements it, such as
Microsoft JScript.NET (AFAIK server-side only), it certainly would.

** Only interested i client side - *unless* - you know that it would be
easier to do a server side implimentation and can tell me how i get
someone's server to do whatever tricks are needed...

That depends on what you are actually looking for. There are image maps
that do not need client-side scripting, and submit the pointer coordinates
relative to the image position to the server; that information could be
evaluated with a server-side script. If you don't mean images, server-side
script cannot be of help obtaining that information (but maybe processing
it).
PointedEars

I have tried HTML MAP and it is useful to a small extent; what i
found can only link to another web page OnMouseOver or the like - no
coordinates.
If you know of a syntax or such that will give coordinates, then i
would appreciate learning of such.

[Robert Baer]

Randy Webb wrote:

Robert Baer said the following on 4/1/2006 4:00 AM:

Thomas 'PointedEars' Lahn wrote:

Robert Baer wrote:
It seems i am using Java Script, [...]

Yes, it only seems to be so. There is no "Java Script".
See my other followup.
PointedEars

Well, i am using some kind of Java code of some sort...

You are using Javascript, not Java Script, and Thomas was being
childishly immature and pedantic about it.

And you mentioned Java Script 2.0 so one might conclude that either
it does exist or that someone is a liar somewhere...

It exists - in theory.

Are you saying that there are *three* differing languages, "Java",
"JavaScript " and "Java Script"????
Or are there many similar-sounding languages depending which letter
is capitalized, where there is a space, etc?