Master the skills and usage of Java decompilation tools

Quickly get started with Java decompilation tool skills, you need specific code examples

Introduction: In the field of software development, decompilation (decompilation) is a common technology. Use Convert compiled binary code into readable high-level program source code. As a commonly used programming language, Java also has related decompilation tools available. This article will introduce several common Java decompilation tools and provide specific code examples to help readers quickly get started using these tools.

1. Common Java decompilation tools

1. JD-GUI (Java Decompiler Graphical User Interface)
   JD-GUI is a graphical interface decompiler developed based on Java Tool that can convert .class files into .java source code. JD-GUI is simple to use, has a friendly interface and is suitable for beginners.
2. Bytecode Viewer
   Bytecode Viewer is a powerful decompilation tool that supports multiple bytecode formats and provides two working modes: graphical interface and command line interface. Bytecode Viewer can decompile Java class files and also supports decompiling Android APK files.
3. CFR (Common Flow Representation)
   CFR is a command line decompilation tool developed based on Java, which can decompile .class files into more readable Java source code. CFR has good decompilation accuracy and performance, and performs well when processing some complex Java codes.
4. Procyon
   Procyon is a fast and accurate Java decompilation tool that supports multiple Java versions and syntaxes and can decompile .class files into Java source code. Procyon provides command line tools and is also available as a library.

2. Examples of using Java decompilation tools

1. Use JD-GUI to decompile .class files
   First, we need to download and install the JD-GUI tool . After the installation is complete, open JD-GUI and click the "File" option in the menu bar, select "Open File", and select the .class file that needs to be decompiled. JD-GUI will automatically decompile the .class file into .java source code and display it on the interface.

2. Use Bytecode Viewer to decompile .class files
   Bytecode Viewer can be used through the graphical interface or the command line. In the graphical interface, after opening Bytecode Viewer, click the "File" option in the menu bar, select "Open File", and select the .class file that needs to be decompiled. On the command line, you can use the following command to decompile:

   java -jar BytecodeViewer.jar -open file.class

   where "file.class" is the path to the .class file that needs to be decompiled.

3. Use CFR to decompile .class files
   CFR is a command line tool. Use the following command in the command line to decompile:

   java -jar cfr.jar file.class

   Among them, " file.class" is the path to the .class file that needs to be decompiled. CFR will output the decompiled Java source code to the command line.

4. Use Procyon to decompile .class files
   Procyon can be decompiled through the command line, use the following command:

   java -jar procyon.jar file.class

   Where, "file.class" is The path to the .class file that needs to be decompiled. Procyon will output the decompiled Java source code to the command line.

Summary: Java decompilation tool is a common technology in the software development process, which can help us understand the implementation details of compiled binary code. This article introduces several common Java decompilation tools and provides usage sample codes, hoping to help readers quickly get started using these tools. Of course, decompilation tools are only for learning and research purposes, and need to comply with relevant laws and treaties, and may not be used for commercial misappropriation or illegal activities.

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