![]() You don't have to delete the old JDK, it won't hurt. ![]() It's best to just delete the old Public JRE. At the same time, you should take into account that in Windows, the installers of the old Public JRE copied java.exe to the C:\Windows\System32 directory, which is also registered in PATH. If you want to do this from the command line, you should make sure that the path to java or to java.exe from JDK11 is set, in the environment variable PATH, before the path to java or to java.exe of older JREs. If you are a developer, you can run your program using JDK 11.
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