How to install Java De-Compiler

Java decompiler is very important to decompile the .class file into a .java file which is plain text file. So In this article, I am going to show how to install Java De-Compiler in windows and Linux/Unix systems.

There are 2 ways to install java -decompiler in the systems

1. JD-GUI
2. JD-Eclipse

 

JD-GUI

In this again we have multiple options to install java de-compiler

1. Windows – jd-gui.exe file installation (which may need administration permissions )
2. Windows – jar file execution (administration permissions not required. which is a better option)
3. Linux / Unix  – RPM/Debian package installation (which may need administration permissions)
4. Linux / Unix  – jar file execution (administration permissions not required. which is a better option)

 

Windows – jd-gui.exe – Graphical User Interface

 

Download Windows .exe file from java de-compiler official website. There are two options 1. Overview and 2. Download. Select the Download option to see the list of available software.

Click on  jd-gui-windows-1.6.6.zip

Once downloaded the zip file, you can unzip it.

 

Double click on jd-gui.exe to open java decompiler console.

 

Drag and Drop the .class files into java decompiler console and then you can see the java code.

 

Windows: Jar File execution

 

Download jd-gui-1.6.6.jar

Copy the jar file into D:\Java-Decompiler\jd-gui-1.6.6.jar

Open the windows command prompt, go to the jar location and execute the command to run java de-complier. For this not required system administrator permissions.

D:\>cd Java-Decompiler

D:\Java-Decompiler>java -jar jd-gui-1.6.6.jar

Then the same above java decompiler console will be opened and drag and drop the .class files to de-compile to java file. Here there is no change in GUI.

Note:

We can use the same jar file for Linux / Unix also and also use the above same command, execute it to run the java-decompiler.

 

 

Linux / Unix : RPM/DEBIAN

Same as the Windows system, you can download jd-gui-1.6.6.rpm   jd-gui-1.6.6.deb either .rpm or .deb according to OS flavor,  and then click the rpm and dev file to run java-Decompiler. There is no change in the GUI level.

 

JD-Eclipse

Download jd-eclipse-2.0.0.zip and keep it in the folder D:\Java-Decompiler

 

We can install Java decompiler plugin in eclipse, so for this, we need to install eclipse first and then install the JD plugin in the eclipse market place.

Suppose eclipse already installed in your system, then go to

Help –> Install New Software

 

 Drog and Drop the zip file on the dialog window and Check “java decompile eclipse plug-in”

 

 

 

Click on Next and finish button

 

 

 

5) A warning dialog windows appear because “org.jd.ide.eclipse.plugin_x.y.z.jar” is not signed. Click on the “Install anyway” button.

 

After installation completed, restart the eclipse to reflect the plugin.