In Ethereum, if a smart contract gets some stablecoin or token, it wont know about it unless things are done in a special way however if it receives ethereum a method is called automatically in the contract.
Now if HBD is the analogue to ether in this network we can build contracts with HBD that are safer to use and more simple than contracts involving say USDT on Ethereum.
Contracts in Java as opposed to solidity is one start. Another is the fact the contracts will be on scalable nodes since they are not at the base layer. Nodes can carry the contracts they want. Also, each contract will be able to access any other within the system.