A Java Decompiler is a special type of decompiler which takes a class file as input and produces Java source code as output. The decompilation is exactly the reverse process of compilation. Thus, decompiler does not produce a replica of the source code. It is because a bit of information lost from the source code during the compilation of the program.
![Dj Java Decompiler Dj Java Decompiler](https://images.sftcdn.net/images/t_app-cover-m,f_auto/p/c49bcd3c-96da-11e6-b22a-00163ec9f5fa/1706379839/dj-java-decompiler-screenshot.jpg)
But there are many complexities, for example, Java code is structured, and byte code is not structured. Moreover, the transformation is not one to one: two different Java programs may yield identical byte code.
Jul 05, 2015 Java decompiler is a tool which is designed in such a way that it is capable of converting.class file into Java source code. It will not give the exact java source code from which the.class file is generated but most of the code will be same. Decompiler is really helpful in case you lost the source code. DJ Java Decompiler DJ Java Decompiler is yet another standalone windows application. It is available for Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 8, 8.1 and 10. The Java Decompiler website HTML 15 28 0 0 Updated Dec 25, 2019. Jd-eclipse A Java Decompiler Eclipse plugin Java GPL-3.0 198 577 25 4 Updated Jul 17, 2019. Top languages.
There are following Java decompilers available:
Dj Java Decompiler Download
- DJ Java Decompiler
- JReversePro
- JODE
- JD-CORE/ JD-GUI/ JD Eclipse
JAD Decompiler
The JAD is a command-line application. It is written in C++. The main function is to disassemble the .class files. JAD can be deployed from the console, and it will decompile Java classes into the source code. This way, developers can look deep into the code of Java runtime libraries and even beautify the lines, preparing them for a recompilation. There is a risk of overwriting of source code files, especially when the '-o' (overwrite output files without confirmation) parameter is used.
Example
Let's create a simple Java program which adds two number.
Follow the steps to convert the .class into readable Java source code. Here we are using JAD decompiler.
Step 1: Download JAD tool from https://bit.ly/2XuRzT5
Step 2: Extract the zip file and get jad.exe.
Step 3: Create a .java file (DecompilerDemo.java) in the same folder in which you have extracted the zip file.
Step 4: Compile and run the .java file. It will generate a .class file in the respective folder.
Step 5: Now move the .class file and jad application to another folder.
Step 6: Type the command: jad DecompilerDemo
Above command generates a .jad file in the respective folder.
Step 7: Type the command: jad ?s java DecompilerDemo
It generates the .java file in the same folder.
Open the DecompilerDemo.java we get the following code:
We can observe that written .java file is different from the generated .java file but gives the same output.
Java Class File Disassembler Prince and the revolution parade rar.
javap Command
The javap is a Java command line tool which comes with JDK. It is used to disassemble the class file and prints a human-readable version of that class. Its output depends on the option used. Without using any option, javap prints the package, protected and public fields and methods of the classes passed to it. A javap is also used to find out which methods are available for a class if you don?t have the source code that was used to create the class. The general format of javap command is:
Options
With javap command, many options are available. Some of them are:
- -c: It prints disassembled code.
- -p: It shows all classes and members.
- -s: It prints internal type signatures.
- -constants: It shows static final constants.
Disassemble a class file using javap command
Generate the class file of the above program and use the following command to disassemble the class file.
Output
The following output shows what the class file has inside.
But we do not get the Java source code by using the javap command. So there are many decompilers available which convert a .class file into a .java file.
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What is Java Decompiler ?
Java decompiler converts .class file into java source code. In other words, decompiler converts bytecode into readable .java format.You can use java decompiler to look into the code of predefined java classes like HashMap, HashSet , ArrayList etc. You can find out how Sun/Oracle java developers wrote the java classes which are currently used by billion of devices in the world.Java source code from which the .class file has been generated will not exactly match the java source code generated from the java decompiler. But most of the code will be same.
Read Also : Java 8 Features
After installing java, you can find the predefined java classes in the rt.jar inside JRE folder. Unzip rt.jar and all the predefined java classes will be present in the bytecode(.class) format. By using java decompiler, I have written the articles how HashMap works in java, how HashSet works in java. So let's find out best java decompilers which I have used and now I am recommending it to you.
Best Java Decompilers
1. JDProject
JDProject is one of the most frequently used java decompiler offline.It is developed to decompile java 5 or later versions(as of now till java8). It is available for Windows, Mac OS and Linux. It is a best decompiler for eclipse and intellij too as it provides plugin for each platform. JD-Eclipse is a plug-in for the Eclipse platform while JD-Intellij is a plug-in for Intellij IDEA.
You can download JDProject java decompiler from here
Dj Java Decompiler Key
2. Procyon
Procyon is a java decompiler developed by Mike Strobel. Procyon decompiler handles java language enhancements from jdk 1.5 and beyond that most other decompilers don't. Procyon does well with enum declarations, annotations and java 8 lambdas and method references. You can find the wiki here comparing Original code, Procyon decompiler code and JD decompiler code. Although wiki above makes Procyon looks good, but I still prefer JDProject over Procyon. Procyon is relatively new and still work in progress.
3. Cavaj Java Decompiler
If you are a Windows user, then Cavaj is a good option as a decompiler. It is simple to use and decompiles nearly any java class file. The main drawback of Cavaj is that it lacks syntax highlighting.
Also, it is not available for Mac or Linux OS. In short, it is a freeware standalone windows application which converts bytecode(.class) files to java source code.
4. DJ Java Decompiler
DJ Java Decompiler is yet another standalone windows application. It is available for Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 8, 8.1 and 10. You don't need to have the JVM (Java Virtual Machine) or any other java JDK installed. The main advantage of DJ Java Decompiler is that you can decompile more than one java class file at one time. DJ Decompiler enables users to users to save, print, edit and compile the generated java code.
5. JBVD
JBVD stands for java bytecode viewer and decompiler. It is based on the javassist open source library. It is only available for Windows OS. JBVD requires java to be installed on your device to work.
6. AndroChef
Dj Java Decompiler 2.8
AndroChef is also a windows based java decompiler application. With AndroChef Java Decompiler you can decompile apk., dex, jar and java class-files. It's simple and easy. AndroidChef supports Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 8, 8.1 and 10. AndroChef successfully decompiles java6, java 7 and java 8 .jar and .class files.
CFR stands for Class File Reader. It is completely written in java 6. It supports latest features of java8 like lambdas while decompiling. You do not need to worry if you are using java 8. The only drawback of this decompiler is that it is not an open source program. Although, it has a command line tool which is ideal in making the decompiling process efficient and faster.
8. Fernflower
Fernflower is an analytical decompiler for java. It is used to decompile class, zip and jar file extensions. It is still under development.