Download OpenJDK release (https://jdk.java.net/15/) with wget
mkdir /usr/lib/jvm/jdk-15.0.1/
tar xvf openjdk-15.0.1_linux-x64_bin.tar.gz -C /usr/lib/jvm/jdk-15.0.1/
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Add to EOF vim /etc/profile:
export JAVA_HOME=/usr/lib/jvm/jdk-15.0.1/
export PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
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Run commands to make a new Java release the default one:
update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk-15.0.1/bin/java" 1
update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk-15.0.1/bin/javac" 1
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In case of multiple Java versions installed:
update-alternatives --config java
update-alternatives --config javac
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