converting jar to .class or .java

**marmara95** · 03-17-2008, 09:14 AM

is it possible converting jar to .class or .java? can anyone help me about this please?

**Eranga** · 03-17-2008, 12:04 PM

First of all, welcome to Java Forum community.

Yes you can. Used winrar and extract your jar file. You can get collection of class files.

If you want to take Java files, use a decompiler to do it.

By the way, why do you want to do this.... :)

Eranga.

**marmara95** · 03-17-2008, 01:21 PM

thank you for your cooperation

**Eranga** · 03-19-2008, 06:59 AM

Is that work? Did you get Java files using decompiler?

**Rajesh** · 03-19-2008, 02:01 PM

go to command prompt

Now check with src.jar file which is by default present in all jdks
After doing this you can able to see folder with same name as jar
file and navigate through folder you can able to see list of .java and .class files. Simillarly you can derive lot of .class and .java from jar.

c:\>cd jdk1.6\bin

c:\jdk1.6\bin> jar -xvf src.jar

or use Winrar or winzip software to extract .java and .class file from .jar file

**marmara95** · 03-21-2008, 09:54 AM

yes it works. thank you very much again :) i'm beginner so i understand step by step.

**ram035** · 10-05-2012, 08:34 PM

hello guys,
i am just started working in java,
i had a question how can we extract the .class files from jar file ?....
can any one explain it in detail !....

**ram035** · 10-05-2012, 08:36 PM

hello guys,
i am just started working in java,
i had a question how can we extract the .java files from jar file ?....
can any one explain it in detail !....

**JosAH** · 10-05-2012, 08:37 PM

Originally Posted by ram035

hello guys,
i am just started working in java,
i had a question how can we extract the .class files from jar file ?....
can any one explain it in detail !....

Type "jar -help" and see all the details; oh, and please don't resurrect old threads for this completely unrelated question; new threads are free.

kind regards,

Jos

**ram035** · 10-05-2012, 09:21 PM

hello eranga ,

i first extracted the jar file i got bunch of class files with help of winrar , but i want java files.

classe files are generated by compiler ?..

what should i have to do for .java files?....

**AeneasTroy** · 10-05-2012, 10:29 PM

1. You write java code in a .java file. These files are referred to as the "Source Code".

2. The java compiler javac compiles it into a class. These aren't readable in a text editor.

3. The class files get packed into a .jar file for distribution. These .jar files are either executable
or they are library packages. They can be unjarred with the same file that jarred it (jar.exe)
or another decompressor.

4. In order to change a .class file back into a .java file, you need to decompile it. This is the opposite
of compiling it(see step 2)

I have never used a java decompiler before. But here is an example: JD-Eclipse | Java Decompiler

This is a plugin for the Eclipse IDE.