Security issue from jar file

Is jar file perfectly secure to run from some web site in internet?Is there any way the developer make a program that could harm my computer(client) or server?
[180 byte] By [fadill] at [2007-9-26 1:16:32]
# 1
HiUse the jarSigner tool for making it more secured. http://java.sun.com/docs/books/tutorial/security1.2/toolfilex/step3.htmlI hope this will help you.ThanksBakrudeenTechnical Support EngineerSun MicroSystems Inc, India
bakrudeen_indts at 2007-6-29 0:44:30 > top of Java-index,Desktop,Deploying...