Extract source code from .jar file

To extract the source code from a .jar file, you can use a decompiler such as JD-GUI or Cavaj Java Decompiler.

To extract the source code using JD-GUI:

  1. Download and install JD-GUI from the official website (https://jd.benow.ca/).
  2. Open JD-GUI and click the "Open" button.
  3. Select the .jar file that you want to decompile. JD-GUI will extract the .class files from the .jar file and display them in a tree view.
  4. Select a .class file in the tree view, and the decompiled source code will be displayed in the main window.
  5. To save the source code to a file, click the "Save" button and specify a file name and location.

To extract the source code using Cavaj Java Decompiler:

  1. Download and install Cavaj Java Decompiler from the official website.
  2. Run Cavaj Java Decompiler and click the "File" menu, then select "Open JAR/Zip".
  3. Select the .jar file that you want to decompile. Cavaj will extract the .class files from the .jar file and display them in a tree view.
  4. Select a .class file in the tree view, and the decompiled source code will be displayed in the main window.
  5. To save the source code to a file, click the "File" menu, then select "Save as..." and specify a file name and location.

Keep in mind that decompiling .class files is not always accurate, and the decompiled source code may not exactly match the original source code. Some features, such as comments and original variable names, may be lost during the compilation process.