How to decompile an entire project with Java Decompiler?

To decompile the entire Java project, you can follow these steps:

1. Download and install a Java decompiler, such as JD-GUI or Fernflower.
2. Open the decompiler and select the .jar or .class file of the project you want to decompile.
3. The decompiler will display the source code of the project. You can view and save this source code.

Note: The decompiled code may not be identical to the original code as the compiler may optimize and modify the code.