Here are some links to some other resources.
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Programming tools and documentation
Several resources are available on the Java website at Oracle. Most importantly, you can download the latest Java Development Kit (JDK), and read the Java platform documentation. If you download the JDK, be sure to get the latest version.
Pertinent information about the OCAJP 8 exam can be found here.
The main page for Java Training from Oracle University provides the links to Java certification.