Architecture
First we check which architecture we are running on.
Open a terminal and type the command arch.
The output could be i686 or i386 for a 32 bits system or x86_64 for a 64 bits system.
Environment
Your environment could already have an installation or not. Open a terminal and type the following command :
user@machine:~$ java -version
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) Server VM (build 25.25-b02, mixed mode)
user@machine:~$
In the previous output we can see that the command has been successfully executed. It gives us the default version.
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