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OpenJDK or JDK?

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linux-howto

http://askubuntu.com – I'm new to Java development under Ubuntu. When I typed javac in the terminal, it prompted me to install OpenJDK and a bunch of other JDKs. I want to know if there is any difference between OpenJDK 7 and Oracle's JDK 7. Are they basically the same? Thanks. (HowTos)