Yes, the package declaration. Packages correspond to directories, so whe=
n you compile this it creates ./com/company/Main.class and the=
n you run it using

% java com.company.Main

You can leave out the package declaration and it will stay in the same d=
irectory.

CL

Ruben Safir ruben-at-mrbrklyn.com=
writes:

why doesn=E2=80=99t this one work?

[ruben-at-localhost cs664s16]$ java Main Error: Could not find or load main=
class Main

[ruben-at-localhost cs664s16]$ javac Main.java [ruben-at-localhost cs664s16]$ =
java Main Error: Could not find or load main class Main

package com.company;

public class Main {

public static void main(String[] args) {
// write your code here
    System.out.println("Hello, cs664s16!");
}

}

I presume it has something to do with the package declaration

On 01/22/2016 10:23 AM, Christopher League wrote: > > Of course it=
works, you just have it backwards: > > - The .class fil=
e is binary like .o, so you don=E2=80=99t edi=
t it with > vim. > > - The .java file is=
your source file, so that=E2=80=99s what you edit. > > - Then you co=
mpile the .java file with javac (the compiler) an=
d > that generates the .class. > > - Then you run the=
.class with java which is the virtual machine. &=
gt; (But you just specify the name of the class, and leave out the > de>.class). > > - Also, if the declared name of your class (as=
in class Hello) does > not match the filename (maybe it=E2=
=80=99s myprog.java), the class file it > generates will us=
e the declared name rather than the filename. So > myprog.javade> still compiles to Hello.class if it declares class &=
gt; Hello. > > See transcript: > > ~~ >=
; % cat Hello.java > class Hello { > public static void main(String[]=
args) { > System.out.println(=E2=80=9CHello world.=E2=80=9D); > } &g=
t; } > % javac Hello.java > % java Hello > Hello world. > > =
Script done on Fri 22 Jan 2016 10:18:36 AM EST > ~~ > >=
CL > > Ruben Safir ruben-at-mrbrk=
lyn.com writes: > >> On 01/22/2016 09:02 AM, Christopher Leagu=
e wrote: >>> >>> To get their 1-year license you don=E2=
=80=99t need picture ID if you use a >>> .edu address=
. And even then you don=E2=80=99t need an account because there is >>=
> the IntelliJ community edition. The community edition=
is free >>> software (FSF definition) because it=
=E2=80=99s distributed using the Apache >>> 2.0 license. =3D"http://www.gnu.org/licenses/license-list.en.html#apache2" class=3D"uri"=
>http://www.gnu.org/licenses/license-list.en.html#apache2 >>> =
So that should meet your requirements. >> >> >> Or maybe =
not >> >> [ruben-at-localhost cs664s16]$ vim ./Main.class >>=
[ruben-at-localhost cs664s16]$ java ./Main.java >> Error: Could not fin=
d or load main class ..Main.java >> >> >> I changed the c=
lasspath with no luck >> >> [ruben-at-localhost cs664s16]$ vim ./M=
ain.class >> [ruben-at-localhost cs664s16]$ java ./Main.java >> Er=
ror: Could not find or load main class ..Main.java >> [ruben-at-localhos=
t cs664s16]$ java -classpath .:CL>ASSPATHMm>ain.=E2=80=84>=E2=80=84=E2=80=84>=E2=80=
=84Main.cla<=
em>ssMain.ja=
va=E2=80=84>=E2=80=84=E2=80=84>=E2=80=84[r=
uben-at-loc>alhostc=
s664s16] java -classpath .:C<=
/em>LASSPAT<=
em>HMain.jav=
a=E2=80=84>=E2=80=84=E2=80=84>=E2=80=84Er<=
/em>ror=E2=80=84:=E2=80=84Com>uldnotfiem>ndorloam>dmainclaem>ssMain.j<=
em>ava=E2=80=84>=E2=80=84=E2=80=84>=E2=80=84[<=
em>ruben-at-loc=
alhostc=
s664s16] set|grep CLASS >> CLASSPATH=3D.:.:/=
home/ruben/GNUstep/Library/Libraries/Java:/root/GNUstep/Library/Libraries/J=
ava:/usr/lib/GNUstep/Libraries/Java >> >> >>> >>=
> However, yes =E2=80=93 we can proceed with your preferred vide>/sh IDE. When >>> programs get more complicated th=
an Hello World, you=E2=80=99ll want a build >>> system. (Unfortuna=
tely, make doesn=E2=80=99t work so well for Java.) To build &g=
t;>> non-trivial programs, I recommend gradle (also Apac=
he 2.0). >>> =
http://gradle.org/license/ >>> >>> So here=E2=80=99s =
the essence of the software setup: >>> >>> - You still ne=
ed an account on https://g=
it.liucs.net/ =E2=80=93 that=E2=80=99s a >>> server I administ=
er (although it is virtual) and it=E2=80=99s free software >>> href=3D"https://gitlab.com/gitlab-org/gitlab-ce/blob/master/LICENSE" class=
=3D"uri">https://gitlab.com/gitlab-org/gitlab-ce/blob/master/LICENSE &g=
t;>> >>> - Upload your SSH public key to that server so that=
git can log in. >>> >>> - Create a project =
on that server, as described in the instructions. >>> >>>=
- Give my account access to your project on the server. >>> >&=
gt;> - git clone using the URL for the project, so now you =
have a local >>> copy. >>> >>> - Create a Java =
=E2=80=9Chello world=E2=80=9D program, build and test it. (Can just >>=
;> use javac to compile and java to run =E2=80=
=93 either go with JDK7 if >>> you=E2=80=99re okay with that licen=
se, or try OpenJDK8. >>> >>> - Then do git adde> then git commit and git push to upload your &g=
t;>> code to the server where I can access it. >>> >>&=
gt; That=E2=80=99s all I need for right now. When we have some more classes=
and >>> libraries, we can talk about getting gradle =
to build the code. >>> >>> Also, work on the exercises in=
the language theory notes =E2=80=93 they will >>> help. =3D"https://liucs.net/cs664s16/" class=3D"uri">https://liucs.net/cs664s16/<=
/a> >>> >>> CL >>> >>> >>> Rub=
en Safir ruben-at-mrbrklyn.com write=
s: >>> >>>> OK - to be fair, I looked at the jetbrain,=
it I=E2=80=99m not sending them picture ids >>>> of me, or agr=
eeing with their license.
>>>> >>>> So please,=
Dr League, just tell me what you want for the first assignment >>>=
;> and I=E2=80=99ll figure it out. I don=E2=80=99t need a broken and enc=
umbered editor with >>>> integrated git access. I have shells, =
and X11, git and such.
>>>> >>>> CHRIS I HAVE =
CANCER, a bone tumor planted in my hand like a time bomb. I don=E2=80=99t &=
gt;>>> want to waste what is left of my life learning the greatest=
proprietary object >>>> of the day >>>> >>&g=
t;> >>>> >>>> On Thu, Jan 21, 2016 at 05:46:55PM=
-0500, Christopher League wrote: >>>>> >>>>>=
I added some fairly comprehensive notes about language theory: >>>=
;>> uri">https://liucs.net/cs664s16/lang-theory.html and embedded within th=
em >>>>> are some exercises you probably should try, to make=
sure you understand >>>>> about automata and grammars. >=
>>>> >>>>> I also uploaded instructions for sett=
ing up your Git server account and >>>>> Java development en=
vironment: =
https://liucs.net/cs664s16/setup.html so >>>>> you can g=
et started with that. >>>>> >>>>> The softwar=
e setup instructions form the first part of assignment 1, but >>>&=
gt;> there will be a bit more yet to come (probably available by Friday =
>>>>> afternoon). tml" class=3D"uri">https://liucs.net/cs664s16/a1.html >>>>&=
gt; >>>>> CL >>>> >>>> >>>&=
gt; >>>> >>>> =E2=80=93 >>>> So many im=
migrant groups have swept through our town >>>> that Brooklyn, =
like Atlantis, reaches mythological >>>> proportions in the min=
d of the world - RI Safir 1998 >>>> http://www.mrbrklyn.com >=
;>>> >>>> DRM is THEFT - We are the STAKEHOLDERS - RI =
Safir 2002 >>>> http://www.nylxs.com - Leadership Development i=
n Free Software >>>> http://www2.mrbrklyn.com/resources - Unpub=
lished Archive >>>> http://www.coinhangout.com - coins! >>=
;>> http://www.brooklyn-living.com >>>> >>>> =
Being so tracked is for FARM ANIMALS and and extermination camps, >>&=
gt;> but incompatible with living as a free human being. -RI Safir 2013 =
>>> >> >> >> =E2=80=93 >> So many immigran=
t groups have swept through our town >> that Brooklyn, like Atlantis,=
reaches mythological >> proportions in the mind of the world - RI Sa=
fir 1998 >> http://www.mrbrklyn.com >> >> DRM is THEFT - =
We are the STAKEHOLDERS - RI Safir 2002 >> http://www.nylxs.com - Lea=
dership Development in Free Software >> http://www2.mrbrklyn.com/reso=
urces - Unpublished Archive >> http://www.coinhangout.com - coins! &g=
t;> http://www.brooklyn-living.com >> >> Being so tracked is=
for FARM ANIMALS and and extermination camps, >> but incompatible wi=
th living as a free human being. -RI Safir 2013 >

=E2=80=93 So many immigrant groups have swept through our town that Broo=
klyn, like Atlantis, reaches mythological proportions in the mind of the wo=
rld - RI Safir 1998 http://www.mrbrklyn.com

DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.=
com - Leadership Development in Free Software http://www2.mrbrklyn.com/reso=
urces - Unpublished Archive http://www.coinhangout.com - coins! http://www.=
brooklyn-living.com

Being so tracked is for FARM ANIMALS and and extermination camps, but in=
compatible with living as a free human being. -RI Safir 2013