1.0.0-beta4 is a developer preview that supports major parts of:
- Azure Virtual Machines and VM Extensions
 - Virtual Machine Scale Sets
 - Storage
 - Networking (virtual networks, subnets, network interfaces, IP addresses, network security groups, load balancers, DNS, traffic managers and application gateways)
 - Resource Manager
 - SQL Database (databases, firewalls and elastic pools)
 - App Service (Web Apps)
 - Key Vault, Redis, CDN and Batch.
 
What's new since 1.0.0-beta3:
- DNS
 - Traffic manager
 - Application gateways
 - SQL Databases
 - App Service (excluding App Service Environments, Backup, Restore, Azure Functions)
 - Redis Cache
 - CDN
 
You can find samples on how to use them here: https://github.com/azure/azure-sdk-for-java#sample-code.