Switching System Java
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4. Setting Up JavaNext to Set Up Oracle Java JDK 13 
 You can directly Copy & Paste the Commands into Terminal..sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-13*/bin/java 1165 sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-13*/bin/javac 1165 sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-13*/bin/jar 1165 sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk-13*/bin/javaws 1165 Checking or Setting the System Java Version in Use with sudo update-alternatives --config java And for the Java Compiler instead: sudo update-alternatives --config javac To Switch of Java Version Just Enter the Selection Number on First, Column. :)   
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5. Setting Up Env(Optional) Setting JAVA_HOME User Environment Variable 
 And Edit the Bash environment Configuration filenano $HOME/.bashrc Append: export JAVA_HOME=/usr/lib/jvm/jdk-13[Release] Replace [Release] with the actual one on the above Command. 
 Possibly to Check the JDK 13 exact PATH use in another window:ls /usr/lib/jvm/ Ctr+x to Save & Exit from nano Editor :) 
 Next to Load the New Bash Environment:bash 
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Finally, Test New Java JDK 13 Installation. java -version 
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