Ubuntu updating java
The JDK is usually only needed if you are going to compile Java programs or if the software that will use Java specifically requires it.
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Oracle Java (JDK) Installer (automatically downloads and installs Oracle JDK8 / JDK9). Ubuntu 16.10 Yakkety Yak is no longer supported by Canonical (and thus, Launchpad and this PPA).
The PPA supports Ubuntu 17.10, 17.04, 16.04, 14.04 and 12.04.
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You have successfully installed Java on Ubuntu 16.04.