To see the content of a .jar file.
A simple method to see the content of a
.jar file: firstly rename it in
.zip file and open it.
If you want to see the content of java programs compiled in
.class, you must use a Java decompiler like JAD: (a program that reconstructs the original source code from the compiled binary
.class files).
http://www.kpdus.com/jad.html
Note that some
.class files are protected and cannot be decompiled.