Failed to Call Self Written Class Files in JAVA 1.4

While compiling java application in JAVA 1.4 environment, import command for self written class file fails even though classpath is set and declared during compilation.
It flashes like ". is expected" Please help,
Regards,
Avijit Dutta (e-mail - [email protected])

I had a similar problem with 1.4:
since 1.4 java doesn't accept imports of "top-level packages" any more, i.e. classes, that don't belong to a package can't be imported in other classes.
--> always put your self written classes into a package
then you will be able to import them.
hoschi

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Again,HOW to conver a .class file into .java one?

sorry , but Can't u send me a specific link for downloading this "Java decomplier"??
coz I found my self in something called (jad decompiler) with lots of versions and this is confusing
and Is that mean, that there's a decompiler which can convert the .class file into .java one?
and thanks alot man.....u help me always!
(I'm still begginner in java)

Just to emphasise what yawmark said...
Decompiled java code is NEVER going to be as clear as well-written original java source code. The decompiler can see what the compiled code does but not why or what it means, so the source code that the decompiler produces is going to be ugly and hard to read. Decompilers are really only useful for experienced programmers who know what to infer, how to read between the lines...
If you need help writing something, then you're better off looking at tutorials. In tutorials the code will be well-commented.

How to convert a .class file into .java file without .jad using DeJDecompil

Hi all,
I am using DeJDecompiler and working with swing applications.If I try to convert a .class file into .java file,it is converting into .jad file only.Fine but if I try to save that file into .java file,It is giving lot of errors in that program.When I went into that program the total style of the program is changed and TRY-CATCH block is not recognised by the dejdecompiler,hence If I try to include some methods in the existing .java file thus got,I could not do.Kindly help me.
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With kind Regs
Satheesh.K

Not so urgent today then!
http://forum.java.sun.com/thread.jsp?thread=553576&forum=31&message=2709757
I'm still not going to help you to steal someone�s code.

Class file to java file conversion

is it possible to convert .class file into .java file & if yes
then how to convert .class file into .java file.
plz. mail me ans. on [email protected] | [email protected]

Yes there are many Java Decompilers which converts the Java bytecode class files to Source files, You may find the follwing URLs helpful:
http://www.brouhaha.com/~eric/computers/mocha.html
http://members.fortunecity.com/neshkov/dj.html

How to convert .class files to .java files

Hi,
I want to convert .class files to .java files. Is there is any software for that doing except Dj DCompiler? Because if i am using this i am not getting proper code i mean as it is available in the file.
I tried by writing simple java file and i compiled Sample.java file and i got a .class file then i converted this Sample.class to Sample.java file by using DjDcompiler but i was missing some statements i need entire code that is available in Sample.java file. Please tell me any other software for that doing.
Thank you in advance

I want to convert .class files to .java files.
iles. Is there is any software for that doing except
Dj DCompiler? Because if i am using this i am nothttp://www.google.com/search?hl=en&q=java+decompiler&meta=
getting proper code i mean as it is available in the
file.I doubt you ever will.
I tried by writing simple java file and i compiled
Sample.java file and i got a .class file then i
converted this Sample.class to Sample.java file by
using DjDcompiler but i was missing some statements i
need entire code that is available in Sample.java
file. Please tell me any other software for that
doing.Did you hear about "compiler opimizations"?

How to convert class files into java files??

Hey Guys,
I need a little help.
I want to know wheather we can view .class files as .java files or convert the .class to .java files.Is ther any tool or software for doing that.
Or in other words can i see the source code of any .class file..??
Plz do tell me if we can do that or any other way we can do that.
Regds,
Gokul

Sort of. A "decompiler" will take a class file and generate a source code file of source code that could be compiled to get the class file you started out with. However, it won't be the same source code that was originally used to create the class. Most notably, comments will be missing, and variable names will probably be meaningless.
And before you say "java is bad because you can decompile it", note that any language that you can execute you can theoretically decompile.
Also, you can view the raw byte codes. If you're familiar with assembly language, or better yet familar with java bytecodes and the JVM in particular, you can often find out what a particular method does just by viewing the byte codes.

How to decode java class file to java file

hi
how to decode java class file into java file
regards
kedar

Its really.......... really BAD.
Write ur own code... or use open source code..
Its a bad practice...
however i am telling u ..there is DJ java decompiler.
but mind it there are Obfuscator also....like codeshield and others
take care...
Alok

How to decompile a .class file into .java file using DEJDecompiler?

Hi all,
I am using DeJDecompiler and working with swing applications.If I try to convert a .class file into .java file,it is converting into .jad file only.Fine but if I try to save that file into .java file,It is giving lot of errors in that program.When I went into that program the total style of the program is changed and TRY-CATCH block is not recognised by the dejdecompiler,hence If I try to include some methods in the existing .java file thus got,I could not do.Kindly help me.
If I get the .java file without error then I can process the rest of the functionality.
Thanks in advance
With kind Regs
Satheesh.K

Not so urgent today then!
http://forum.java.sun.com/thread.jsp?thread=553576&forum=31&message=2709757
I'm still not going to help you to steal someone�s code.

Decoding .class file into .java file

How can i decode .class file into .java file?
can any one suggest the same?

sekhar145 wrote:
How can i decode .class file into .java file?by using a decompiler
JAD is a known one , i am sure there are other on the internet, use you favourite search engine on Java Decompiler
can any one suggest the same?by using a decompiler
JAD is a known one , i am sure there are other on the internet, use you favourite search engine on Java Decompiler

Coverting .class files to .java files

Hello Friends,
Can we convert the .class files .ie Java Byte Code in .java /Java file.
If we can do it ,then what are the measures to be taken to avoid this
in order for secuirty aspects.
I would appreciate if you can reply for this query.
Regards
-Prashant .

We's had that argument more times than me's had me
very own Julie.
That dont be working, coz me can rob up your class
loader and then you are stuffed....
If me can run your app, me can get your code.
(Me in the third person that is).Tis a third thing you's can do. You's can write part of the ClassLoader in C/C++ to make it a massiv hassle to decompile. Then have dat ClassLoader decrypt da other class filez. Me uncle Jamal is alwayz doing dat sort of thing.

What is the syntax for calling function from class file by jsp

does anyone here knows what is the syntax of how to call a function from java class file by javascript code or any way to call it?
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for example
<%=pc.functionName(a,b)%>
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thx

Jsp's are executed before the Html forms are created and loaded. Dont try to use a java code function calling on a javascript click. You'll have to explicitly redirect it into a servlet where in you can call the function you want.
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How to convert a .jad file to .class file in JAVA Swings.

Hi all,
Sorry for the interruption.I am also facing the same problem.I am using DEJDecompiler.But my application is not J2ME But J2EE.( a Swing application).I opened .class file and made some changes but I dont know how to convert into a .class file again.
I tried saving .jad file to .java file.Then it is showing lot of errors in Eclipse Platform.I doubt if there are any errors in the .class file already,then how could the program would run.I put all the programs in the respective platforms only and then testing.It fails.
(2) one more question,is if I do not need to disturb any existing coding and need to create a seperate java file which will do my customisation,then what should I do.I could not get any interfaces in the program.
Please help me as the matter is most urgent.
Thanks in advance
With regds
Satheesh.K

I tried saving .jad file to .java file.Then it is
showing lot of errors in Eclipse Platform.I doubt if
there are any errors in the .class file already,then
how could the program would run.I put all the programs
in the respective platforms only and then testing.It
fails.So who's Java program/library are you trying to steal?
(2) one more question,is if I do not need to disturb
any existing coding and need to create a seperate java
file which will do my customisation,then what should I
do.I could not get any interfaces in the program.
Please help me as the matter is most urgent.Wow, you urgently need to steal someones program/library. The best person to give you advice urgently is the owner of the program/library you are trying to steal.
Thanks in advancePlease don't thank me because I'm not going to help you!
With regds
Satheesh.K

How to convert class file to Java source code ?

Hi All ,
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Kindly help me out in doing this reverse engineering process.We have come to know the below steps would help us out.Can someone guide us in acheiving this process step by step.Please add your experience here and let us know what are the other steps required ..
(1)Rename the file from .jar to .zip and extract the .zip file.
(2)Decompile the desired .class file using 3rd party tool and get .java file.
(3)Modify the .java file and compile it.
(4)Now zip the extracted files and rename the it from .zip to .jar.
We need to verify whether the modified .jar file will work
Thanks & Regards
Kar1983

Thanks for your reply ....We have asked them so many times ..but they say they dont have it .Since we have planned to do some enhancements from our end we have planned to do reverse engineering process.

Convert .class files into .java files???

Does anybody know how to convert x.class file back to a x.java file. Or in other terms, extract .java files from a jarfile??
Thanks for any help
/carlos

Does anybody know how to convert x.class file back to a x.java file.As Dr.Clap said, that's decompiling.
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Running the .class file from java code

I'm doing a kind of providing service like compiling and running Java code on server side and giving output to the end user.
Please suggest me an approach with code to run .class file from the Java code.
import java.io.*;
public class demo {
public static void main(String args[]) throws IOException, InterruptedException {
int result;
try {
System.out.println("command output:");
Process proc = Runtime.getRuntime().exec("java -cp . demoh");
InputStream in = proc.getInputStream();
result = proc.waitFor();
BufferedInputStream buffer = new BufferedInputStream(proc.getInputStream());
BufferedReader commandOutput = new BufferedReader(new InputStreamReader(buffer));
String line = null;
System.out.print(commandOutput);
try {
while ((line = commandOutput.readLine()) != null) {
System.out.print(line);
System.out.println("command output: " + line);
}//end while
commandOutput.close();
} catch (IOException e) {
//log and/or handle it
}//end catc
} catch (IOException e) {
System.err.println("IOException raised: " + e.getMessage());
}

What happened when you tried what you have there?

Failed to Call Self Written Class Files in JAVA 1.4

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