But Java runtimes are needed because software developers like Adobe use it, and their products will not install or launch unless you have a runtime installed. Sigh.
In the address bar, type "about:plugins" or "chrome://plugins/", scroll down to Java and select "disable"
Goto to Tools > Add-ons > select Plugins, scroll down to Java and disable
Goto the Safari > Preferences, select 'Security' and deselect Java