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I downloaded the bin file, and installed it but I haven't realized that I made the folder in the current directory. I would like to install in /usr/java.

  1. Can I now just copy paste it there.
  2. Or I need to re-install to desired location
  3. I installed JRE , is that ok or I need to install sdk
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up vote 1 down vote accepted

For development, you need the java development kit, jdk. Otherwise, the jre is fine.

It is quite possible to copy the jre folder to the /usr/java.
Make sure to add its location to the PATH variable.
Check where does java point to -> which java
Afterwards, check its target. E.g. ls -al /usr/bin/java

The chain should end up in your jre folder.

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