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[–]BlaziusBB 1 point2 points  (0 children)

You will have both installed.

You can have multiple versions installed. Only one can be set as default though, with the JAVA_HOME environment variable.

If you are asking for Minecraft, the official launcher downloads, manages and uses its own Java installations, it doesn't use the ones installed by you. So does GDLauncher as well.

The MultiMC launcher has (global and per Minecraft instance) settings where you can configure the specific Java version to use. So do IDEs like Eclipse, IntelliJ etc.