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I had Java 11, then decided to change to Java 8. I uninstalled 11 and installed 8. Then have added these lines into ~/.bashrc:

export JAVA_HOME="/usr/lib/jvm/java-1.8.0-openjdk-amd64"
    export PATH=$PATH:$JAVA_HOME/bin

Executed source ~/.bashrc.
javac -version gives 8, but java -version still shows 11. I tried to use sudo update-alternatives --config javac and set it to 8, but still...

R S
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    AFAIK sudo update-alternatives --config javac sets the JDK version; to set the JRE version, you need sudo update-alternatives --config java – steeldriver Apr 13 '20 at 22:08

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