Can all macs run .app files or .jar files?

Hi everyone,
I'm very confused concerning .app and .jar files. Do all macs natively have the capability to run .jar files?
If not, could i use the jar bundler to create an .app file (would that run on all macs)?
thanks

.jar files are Java files. They may or may not run on most Macs because most Macs do not have Java installed. But one can bundle the Jave interpreter so that Java need not be present on the target computer.
.app files are true executable applications.

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''A troubleshooting mode, which disables most Add-ons.'' <br />
''(If you're not using it, switch to the Default Theme.)''
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