Quickstarts, Samples and Tutorials
https://docs.microsoft.com/en-us/java/azure/
5-minutes Quickstarts for deploying a Java Web App and connecting to other Azure services. Browse through 100+ samples and step-by-step tutorials.

Libraries
https://docs.microsoft.com/en-us/java/azure/java-sdk-azure-overview
The Azure libraries for Java help you manage Azure resources and connect to services from your application code.

Tools
https://docs.microsoft.com/en-us/java/azure/java-azure-tools
Download Azure tools and plug-ins, from Eclipse, IntelliJ to Jenkins as well as Command line tools.