View Java Class Source Code in JAR file
- Download JD-GUI to open JAR file and explore Java source code file (.class .java)
- Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window spring-data-java8-stub-1.4.6.RELEASE.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
java.util
├─ java.util.Optional.class - [JAR]