Edit .class file in Eclipse

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Please how do I edit a .class file in Eclipse? Thanks

I decompiled a Jar file and got the following files

Jar
|+--.classpath
|+--.project
|+-- gh
|+-- org
|+--META-INF
|+--Cert.ser

I used the jar xfv command tool in decompiling the jar file...

I only see class files in this folders...pls how can i edit them for recompilation...since i'm not able to see the .java files in it...