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[ubuntu] How does java/javac installation work in ubuntu?

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http://ubuntuforums.org – Recently I installed jdk 1.7 in ubuntu. These are the steps that I used to install it. 1. Extracted the folder named 'jdk1.7.0' and copied it to '/usr/lib/jvm'. 2. Installed javac using the following command sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0/bin/javac 4 3. Installed java using the following command sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/bin/java 4 I use Ubuntu 12.10 But, I really don't understand why I did all these things and how they work but they did. Can anyone explain how they work in U (Hardware)