We highly recommend that you uninstall all older versions of Java from your system. … Uninstalling older versions of Java from your system ensures that Java applications will run with the latest security and performance improvements on your system.

Is Java necessary on Windows 10?

No, Java is not routinely needed – some websites may try to make use of it, but even if you did install it I would recommend explicitly denying it to be used on websites. I’d actively avoid installing it unless you needed it (in most cases).

What happens if I delete Java?

If you were to uninstall Java (which you absolutely can do), then those programs would either not work until you reinstalled it or they would automatically reinstall it the next time you tried to use them. … If you don’t have Java on your machine, then you don’t have those vulnerabilities.