File Juicer

File Juicer for Mac OS X

Overview of Formats
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Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats
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.class Java files

Are the Java code usually packaged inside jar files and used in Applets and Java Applications.

You can follow the tutorial from Sun: The Java Tutorial on how to make java applications.

.class files are bytecodes, and you can partially decompile them with a tool called mocha, also on MacOS. This require some use of the command line.