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View Java Class Source Code in JAR file

1. Download JD-GUI to open JAR file and explore Java source code file (.class .java)
2. Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window haystack-sample-key-extractors-1.0.1.jar file.
   Once you open a JAR file, all the java classes in the JAR file will be displayed.