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Java used to be a favourite programming language for most of the developers. It was initially developed by sun microsystems. Oracle then took over Sun microsystems. Java used to be free until version 8 (Java 8). But Oracle has changed its license agreements recently. The following link provides clarity on the terms and condition to use Java. Following are free Java alternatives.
https://medium.com/@javachampions/java-is-still-free-2-0-0-6b9aa8d6d244
There are times when you need a specific version of Java to be installed instead of the latest version. The following post will brief on the steps required to remove Java 8 and install Java 7 in Ubuntu 16.04
Always use the latest version of Java as there are quite a lot of bug fixes and security vulnerability has been fixed.
Removing Java 8
Open Terminal and enter the following commands.
sudo update-alternatives –remove-all java
sudo update-alternatives –remove-all javac
sudo update-alternatives –remove-all javaws
sudo rm -rf /usr/lib/jvm/jdk1.8.0
Install Java 7
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
Since Java 7 is no longer available in their repository, you need to manually download it from Oracle site.
Once the JDK 7 tar (jdk-7u80-linux-x64.tar.gz) is downloaded. Paste it in the below location
/var/cache/oracle-jdk7-installer
Now run the following command
sudo apt-get install oracle-java7-installer
After installation you also need to update alternatives by running the following command.
sudo update-alternatives –install “/usr/bin/java” “java” “/usr/lib/jvm/java-7-oracle/jdk1.7.0_80/bin/java” 1
sudo update-alternatives –install “/usr/bin/javac” “javac” “/usr/lib/jvm/java-7-oracle/jdk1.7.0_80/bin/javac” 1
sudo update-alternatives –install “/usr/bin/javaws” “javaws” “/usr/lib/jvm/java-7-oracle/jdk1.7.0_80/bin/javaws” 1
Once the above steps are completed. Check the java version from terminal
javac -version
java -version
It should display jdk 1.7