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DATE 2016-01-01

LEARN

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MESSAGE
DATE 2016-01-22
FROM Christopher League
SUBJECT Re: [Learn] CS664
From learn-bounces-at-nylxs.com Fri Jan 22 19:55:18 2016
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From: Christopher League
To: Ruben Safir
In-Reply-To: <56A245B9.6080400-at-mrbrklyn.com>
References: <87h9i64kkg.fsf-at-lydrik.home.lan>
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<56A245B9.6080400-at-mrbrklyn.com>
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Of course it works, you just have it backwards:

- The `.class` file is **binary** like `.o`, so you don't edit it with
`vim`.

- The `.java` file is your source file, so that's what you edit.

- Then you compile the `.java` file with `javac` (the compiler) and
that generates the `.class`.

- Then you run the `.class` with `java` which is the virtual machine.
(But you just specify the name of the class, and leave out the
`.class`).

- Also, if the declared name of your class (as in `class Hello`) does
not match the filename (maybe it's `myprog.java`), the class file it
generates will use the declared name rather than the filename. So
`myprog.java` still compiles to `Hello.class` if it declares `class
Hello`.

See transcript:

~~~~
% cat Hello.java
class Hello {
public static void main(String[] args) {
System.out.println("Hello world.");
}
}
% javac Hello.java
% java Hello
Hello world.

Script done on Fri 22 Jan 2016 10:18:36 AM EST
~~~~

CL

Ruben Safir writes:

> On 01/22/2016 09:02 AM, Christopher League wrote:
>>=20
>> To get their 1-year license you don't need picture ID if you use a
>> `.edu` address. And even then you don't need an account because there is
>> the **IntelliJ community edition.** The community edition is **free
>> software** (FSF definition) because it's distributed using the Apache
>> 2.0 license.
>> 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 find or load main class ..Main.java
>
>
> I changed the classpath with no luck
>
> [ruben-at-localhost cs664s16]$ vim ./Main.class
> [ruben-at-localhost cs664s16]$ java ./Main.java
> Error: Could not find or load main class ..Main.java
> [ruben-at-localhost cs664s16]$ java -classpath .:$CLASSPATH Main.
> Main.class Main.java
> [ruben-at-localhost cs664s16]$ java -classpath .:$CLASSPATH Main.java
> Error: Could not find or load main class Main.java
> [ruben-at-localhost cs664s16]$ set|grep CLASS
> CLASSPATH=3D.:.:/home/ruben/GNUstep/Library/Libraries/Java:/root/GNUstep/=
Library/Libraries/Java:/usr/lib/GNUstep/Libraries/Java
>
>
>>=20
>> However, yes -- we can proceed with your preferred `vi`/`sh` IDE. When
>> programs get more complicated than Hello World, you'll want a build
>> system. (Unfortunately, `make` doesn't work so well for Java.) To build
>> non-trivial programs, I recommend `gradle` (also Apache 2.0).
>>
>>=20
>> So here's the essence of the software setup:
>>=20
>> - You still need an account on -- that's a
>> server I administer (although it is virtual) and it's free software
>>
>>=20
>> - Upload your SSH public key to that server so that `git` can log in.
>>=20
>> - Create a project on that server, as described in the instructions.
>>=20
>> - Give my account access to your project on the server.
>>=20
>> - `git clone` using the URL for the project, so now you have a local
>> copy.
>>=20
>> - Create a Java "hello world" program, build and test it. (Can just
>> use `javac` to compile and `java` to run -- either go with JDK7 if
>> you're okay with that license, or try OpenJDK8.
>>=20
>> - Then do `git add` then `git commit` and `git push` to upload your
>> code to the server where I can access it.
>>=20
>> That's all I need for right now. When we have some more classes and
>> libraries, we can talk about getting `gradle` to build the code.
>>=20
>> Also, work on the exercises in the language theory notes -- they will
>> help.
>>=20
>> CL
>>=20
>>=20
>> Ruben Safir writes:
>>=20
>>> OK - to be fair, I looked at the jetbrain, it I'm not sending them pict=
ure ids
>>> of me, or agreeing with their license.=20=20
>>>
>>> So please, Dr League, just tell me what you want for the first assignme=
nt
>>> and I'll figure it out. I don't need a broken and encumbered editor wi=
th
>>> integrated git access. I have shells, and X11, git and such.=20=20
>>>
>>> CHRIS I HAVE CANCER, a bone tumor planted in my hand like a time bomb. =
I don't=20
>>> want to waste what is left of my life learning the greatest proprietary=
object=20
>>> of the day
>>>
>>>
>>>
>>> On Thu, Jan 21, 2016 at 05:46:55PM -0500, Christopher League wrote:
>>>>
>>>> I added some fairly comprehensive notes about language theory:
>>>> and embedded within them
>>>> are some exercises you probably should try, to make sure you understand
>>>> about automata and grammars.
>>>>
>>>> I also uploaded instructions for setting up your Git server account and
>>>> Java development environment: =
so
>>>> you can get started with that.
>>>>
>>>> The software setup instructions form the first part of assignment 1, b=
ut
>>>> there will be a bit more yet to come (probably available by Friday
>>>> afternoon).
>>>>
>>>> CL
>>>
>>>
>>>
>>>
>>> --=20
>>> So many immigrant groups have swept through our town
>>> that Brooklyn, like Atlantis, reaches mythological
>>> proportions in the mind of the world - RI Safir 1998
>>> http://www.mrbrklyn.com=20
>>>
>>> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
>>> http://www.nylxs.com - Leadership Development in Free Software
>>> http://www2.mrbrklyn.com/resources - Unpublished Archive=20
>>> http://www.coinhangout.com - coins!
>>> http://www.brooklyn-living.com=20
>>>
>>> Being so tracked is for FARM ANIMALS and and extermination camps,=20
>>> but incompatible with living as a free human being. -RI Safir 2013
>>=20
>
>
> --=20
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind 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 in Free Software
> http://www2.mrbrklyn.com/resources - Unpublished Archive
> http://www.coinhangout.com - coins!
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013

--==-=-=
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable






1.0, user-scalable=3Dyes">




Of course it works, you just have it backwards:



  • The .class file is binary like .=
    o
    , so you don=E2=80=99t edit it with vim.


  • The .java file is your source file, so that=E2=80=99s w=
    hat you edit.


  • Then you compile the .java file with javac=
    (the compiler) and that generates the .class.


  • Then you run the .class with java which is=
    the virtual machine. (But you just specify the name of the class, and leav=
    e out the .class).


  • Also, if the declared name of your class (as in class Helloode>) does not match the filename (maybe it=E2=80=99s myprog.javade>), the class file it generates will use the declared name rather than th=
    e filename. So myprog.java still compiles to Hello.class=
    if it declares class Hello.



See transcript:


% cat Hello.java
class Hello {
public static void main(String[] args) {
System.out.println("Hello world.");
}
}
% javac Hello.java
% java Hello
Hello world.

Script done on Fri 22 Jan 2016 10:18:36 AM EST

CL


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



On 01/22/2016 09:02 AM, Christopher League 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 communi=
ty edition is free > software (FSF definition) because =
it=E2=80=99s distributed using the Apache > 2.0 license. ://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 m=
eet your requirements.


Or maybe not


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


I changed the classpath with no luck


[ruben-at-localhost cs664s16]$ vim ./Main.class [ruben-at-localhost cs664s16]$=
java ./Main.java Error: Could not find or load main class ..Main.java [rub=
en-at-localhost cs664s16]$ java -classpath .:Cm>LASSPATHem>Main.Mai<=
em>n
.classMa=
in.java[r
m>uben-at-locm>alhostcsem>664s16]
java -classpath .:C>LASSPAT=
H
Main.javm>aError=E2=80=84:=E2=
=80=84Couldno>tfindor=
l
oadmain>classMa=
i
n.java[ruem>ben-at-loca<=
em>l
hostcs664>s
16]
set|grep CLASS CLASSPATH=3D.:.:/home/ruben/GNUstep/Librar=
y/Libraries/Java:/root/GNUstep/Library/Libraries/Java:/usr/lib/GNUstep/Libr=
aries/Java



However, yes =E2=80=93 we can proceed with your preferred vi>/sh IDE. When programs get more complicated than Hello World,=
you=E2=80=99ll want a build system. (Unfortunately, make does=
n=E2=80=99t work so well for Java.) To build non-trivial programs, I recomm=
end gradle (also Apache 2.0). ense/" class=3D"uri">http://gradle.org/license/


So here=E2=80=99s the essence of the software setup:



  • You still need an account on s=3D"uri">https://git.liucs.net/ =E2=80=93 that=E2=80=99s a server I ad=
    minister (although it is virtual) and it=E2=80=99s free software "https://gitlab.com/gitlab-org/gitlab-ce/blob/master/LICENSE" class=3D"uri"=
    >https://gitlab.com/gitlab-org/gitlab-ce/blob/master/LICENSE


  • Upload your SSH public key to that server so that git c=
    an log in.


  • Create a project on that server, as described in the instructions.p>


  • Give my account access to your project on the server.


  • git clone using the URL for the project, so now you hav=
    e 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 ru=
    n =E2=80=93 either go with JDK7 if you=E2=80=99re okay with that license, o=
    r try OpenJDK8.


  • Then do git add then git commit and =
    git push
    to upload your code to the server where I can access it.>



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 c=
ode.


Also, work on the exercises in the language theory notes =E2=80=93 they =
will help. https://li=
ucs.net/cs664s16/


CL


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



OK - to be fair, I looked at the jetbrain, it I=E2=80=99m not sending th=
em picture ids of me, or agreeing with their license.


So please, Dr League, just tell me what you want for the first assignmen=
t and I=E2=80=99ll figure it out. I don=E2=80=99t need a broken and encumbe=
red 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 want to waste what is left of my life learning the greatest =
proprietary object of the day


On Thu, Jan 21, 2016 at 05:46:55PM -0500, Christopher League wrote: >=
> I added some fairly comprehensive notes about language theory: > <=
a href=3D"https://liucs.net/cs664s16/lang-theory.html" class=3D"uri">https:=
//liucs.net/cs664s16/lang-theory.html and embedded within them > are=
some exercises you probably should try, to make sure you understand > a=
bout automata and grammars. > > I also uploaded instructions for sett=
ing up your Git server account and > Java development environment: ef=3D"https://liucs.net/cs664s16/setup.html" class=3D"uri">https://liucs.ne=
t/cs664s16/setup.html
so > you can get started with that. > > =
The software setup instructions form the first part of assignment 1, but &g=
t; there will be a bit more yet to come (probably available by Friday > =
afternoon). ht=
tps://liucs.net/cs664s16/a1.html
> > CL


=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




=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






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--===============1783431770==--

  1. 2016-01-19 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] [MITxonedX-at-mit.edu: Learn computer science and get college
  2. 2016-01-22 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] ANTLR Packages
  3. 2016-01-22 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] ANTLR Packages
  4. 2016-01-22 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] ANTLR Packages
  5. 2016-01-22 Christopher League <christopher.league-at-liu.edu> Re: [Learn] CS664
  6. 2016-01-22 Christopher League <christopher.league-at-liu.edu> Re: [Learn] CS664
  7. 2016-01-22 Christopher League <christopher.league-at-liu.edu> Re: [Learn] CS664
  8. 2016-01-22 Christopher League <christopher.league-at-liu.edu> Re: [Learn] CS664
  9. 2016-01-22 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] [christopher.league-at-liu.edu: CS664: Assignment 1 available]
  10. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: ANTLR Packages
  11. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  12. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  13. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  14. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  15. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  16. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  17. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  18. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  19. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  20. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  21. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  22. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  23. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: basics ABC
  24. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: build files
  25. 2016-01-24 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: CS664: Assignment 1 available
  26. 2016-01-27 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] Argent : CSA Club Meeting
  27. 2016-01-27 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] [info-at-israeltechallenge.com: Hello from Tech Challenge

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