Class in another file

[S. McKee]

Hi,

I am very (very very) new to java and have what I am sure is a simple
problem that I hope someone can help with. I have two .java files. The first
has

public final class FormatSWN {

public FormatSWN() throws Exception {

etc etc

}

etc etc
}

This file compiles without an errors. I am wanting to call the FormatSWN
class from within another file. The code in that file is

class CallSWN {
public static void main(String[] cName) {

FormatSWN();
}
}

This file returns a compile error saying "Cannot resolve symbol" and has the
^ pointing at the start of FormatSWN();

Both these files are in the same directory so that should not be an issue.

I know this will be really simple, but it has me stumped. If someone has the
answer, that would be great

Steve

[Ulf_N]

S. McKee skrev:

FormatSWN is a class, it is the "blueprint" for an object of type
FormatSWN. You have to create an *instance* (object) of the class before
tying to call any of its methods. Like so:

FormatSWN myFormatSWNObject = new FormatSWN();

Now you can call methods using your new object:

myFormatSWNObject.aMethodInFormatSWN();

(The identifier 'myFormatSWNObject' is what you decide to call your new
object. The method 'aMethodInFormatSWN' is a method (you) defined in
class FormatSWN.)

/ulf

[S. McKee]

Thanks !!

I also managed to make it work by

try {
new FormatSWN(new String[]{cName[0]});
} catch etc etc

I have one more question if I may. In the FormatSWN class I have a method
called Speakable, that has to use the Vector command to turn something like
123 into one, two, three.

The method is called by

Vector speakable = Speakable(strinput); //strinput is from the call to
FormatSWN (see original post below)

The Speakable method has

Vector Speakable (String[] strinput) {
int i;
int x = 0;
String strword;
Vector strspeakable = new Vector();

for (i=0; i < strinput.length; i++) {
x = Integer.parseInt(strinput[i])

some switch commands on x & a strspeakable.add go here
}

My problem is that the first time in I would expect strinput.length = 3 and
x to equal 1 (if 123 is passed), then 2, then 3 etc, but instead the
strinput.length =1 and x = 123 ?

Can you tell me what is wrong ?

Thanks and sorry for asking obvious questions !

Steve

"Ulf_N" <u...@dontlikespam.se> wrote in message
news:Mbb1e.133348$dP1.4...@newsc.telia.net...

[Ulf_N]

S. McKee skrev:
<snip>

>
> Vector Speakable (String[] strinput) {
> int i;
> int x = 0;
> String strword;
> Vector strspeakable = new Vector();
>
> for (i=0; i < strinput.length; i++) {
> x = Integer.parseInt(strinput[i])
>
> some switch commands on x & a strspeakable.add go here
> }
>
> My problem is that the first time in I would expect strinput.length = 3 and
> x to equal 1 (if 123 is passed), then 2, then 3 etc, but instead the
> strinput.length =1 and x = 123 ?
>

Your result indicate that strinput only contains one string, in the
first element, and that string is "123". It should contain *three*
elements, holding the strings "1", "2", and "3", respectively. (I think
that you perhaps should read a bit more about how classes, objects,
arrays, etc. works in java. It's boring, I know, but it will save you
lots of time. I promise.) /ulf

[Ted Dunning]

You should look at what the difference between the string "123" and the
value returned from "123".split("") is. The first is a string with
three characters and the second is an array that contains four strings,
"", "1", "2", "3". Contemplation on the difference should be
illuminating.

On style, I would recommend that you use a List instead of a Vector. A
List is a data type from the Collections framework which provides a
much better overall selection of classes and allows you to choose when
to use thread synchronization.

Another point is that you seem to be trying to do something useful in a
constructor. If you aren't trying to create an object to use later,
you might be better off using a static method. I should point out that
using static methods is often an indication of poor design.