The Department of Homeland Security is encouraging users to disable Java on their computers (Mac or PC) due to a vulnerability that is being actively exploited.
Note: iPhones & iPads do not allow Java to be installed so you are not at risk on those devices.
According to Oracle a patch is coming in the coming days to fix the vulnerability. Java has had numerous security issues over the years and I would recommend that everyone take Java off of their computer. If at a future date you are trying to do something on your computer that requires Java you can then install the latest version.
You can find instructions for uninstalling Java by clicking the links below: