Reaching this chapter is a notable accomplishment in your Ethereum learning trip, during which you've thoroughly learned how to write smart contracts with Solidity, and how to build a complete DApp using web3.js and Drizzle. We focused, in the last two chapters, on building a decentralized web application on Ethereum using a set of tools, such as Remix or Truffle. In this walkthrough, we will learn how to harness a powerful language, such as Java, to build an Ethereum desktop or mobile application. Along the way, we will discover new concepts in Solidity, such as calling third-party APIs in your smart contracts or libraries.
As we learn by example in this book, we will break into finance and build a financial project that manages a futures smart contract using Java (SE). Throughout this interesting use case, we will go over the following points:
- Building futures solidity contract
- Introducing oracles
- Introducing the web3j API
Another benefit of this chapter is that building a futures smart contract will help you to understand the disruptive force of the blockchain and how smart contracts can alter the financial industry (for example, futures trading market) by automating payments and facilitating business processes.