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I've installed Oracle JDK using this guide. Then I accidently installed OpenJDK(tried to prepare PC to build Android). How do I get back to Oracle Java? Can I keep OpenJDK, but set Oracle Java as default?

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up vote 4 down vote accepted

You should be able to keep both versions without a problem. I found a link that describes how to switch between Java versions on Ubuntu.

To switch between Java versions:

sudo update-alternatives --config java

To switch better javac (complier) versions:

sudo update-alternatives --config javac
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