ping HOSTNAME
To get the IP open command prompt (cmd) and type
In which HOSTNAME is the name of the host (ex. "pserver.no-ip.biz")Code:ping HOSTNAME
As for viewing the source of a class file, you can try to use JAD or JODE to decompile it back into a readable .java file.
JAD Download: http://www.softpedia.com/get/Programming/Debuggers-Decompilers-Dissasemblers/JAD.shtml
JODE Download: http://jode.sourceforge.net/download.php
I can't figure out how to open JAD all that comes up is a black box and then it shuts down again?
jad CLASSNAME.class
Open up cmd and navigate to the directory that JAD and the classfile are in (place them in the same directory) and type
Where CLASSNAME.class is the name of the class file.Code:jad CLASSNAME.class