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This article mainly explains how to use the web3j class library for Android and Java Etaifang development zone block chain. the content in the article is simple and clear, and it is easy to learn and understand. please follow the editor's train of thought to study and learn how to use the web3j class library for Android and Java Etaifang development zone block chain.

How to use web3j to add ethernet block chain support for Java applications or Android App. The content of the tutorial covers the core concepts in Ethernet Square, such as account management, including account creation, wallet creation, transaction transfer, transaction and status, intelligent contract development and interaction, filters and events, etc., as well as a detailed description of how to use the API development interface provided by web3j to interact with Ethernet Square. It is the best choice for java engineers to study the application development of Etay Fang.

Overview of Ethernet Square

ETaifang is a concerned block chain, which constructs a decentralized platform based on cryptography and P2P communication technology. all transactions are stored in each node synchronously, by cascading blocks into a chain. Taifang effectively ensures that the transaction can not be tampered with:

Intelligent contract platform

ETaifang is the first to implement the blockchain of the virtual machine, so it provides a good supporting environment for the operation of the intelligent contract-Smart Contract. It is for this reason that Yitaifang is called blockchain 2.0, which is different from the blockchain 1.0 with digital cryptocurrency as the core feature represented by Bitcoin.

The intelligent contract can be understood as a contract agreement between machines, and the agreed logic is automatically executed when certain conditions are met. for example, in the insurance claim process, if the claim conditions are met, the compensation is automatically released to the insured. This process can be realized by using intelligent contracts.

There are many languages that can develop ethernet smart contracts, but at present the most commonly used language is Solidity, which is similar to JavaScript. In this course, Solidity will be used to explain the development of intelligent contracts.

JSON RPC and web3j

If we want to build a decentralized application (DApp), in addition to the development of smart contracts, we usually need to use other development languages to provide users with the user interface to operate smart contracts, such as developing a web page, a mobile App or a desktop application. All of this code needs to interact with Etay Fong.

Ethernet Fang specifies the JSON RPC API application development interface that each node needs to implement, which is transmission-independent. Applications can use this interface protocol to operate Ethernet square nodes through a variety of communication mechanisms such as HTTP, websocket or IPC.

In theory, you can use any language to develop decentralized applications based on the JSON RPC interface, but in order to improve development efficiency, a better way is to use language-specific JSON RPC wrapper libraries that encapsulate the protocol details of JSON RPC and help developers focus on the implementation of business logic.

Web3j is a lightweight Java development library for integrating Ethernet Fang functions. It is a Java version of Ethernet Square JSON RPC interface protocol encapsulation implementation. If you need to connect your Java application or Android application to Ethernet Fang, use web3j.

Overview of web3j system

The functions of web3j are organized in different packages, and the following figure shows the dependencies between the main packages of org.web3j:

The encapsulation of the core:JSON RPC protocol is mainly implemented by the package org.web3j.core, which depends on the key and signature-related functions provided by the org.web3j.crypto package and the java/solidity type mapping support provided by the org.web3j.abi package.

The console:org.web3j.console package implements a command line program web3j that can be run separately, which we will use to generate Java wrapper classes for solidity contracts, where the org.web3j.codegen package implements code generation from abi to java wrapper classes.

Node related: the org.web3j.infura package encapsulates the http access service interface to the Infura common node, while org.web3j.geth and org.web3j.parity encapsulate the management interface of the two commonly used Ethernet square node software.

The purpose of this course is to help java engineers quickly master the skills of using web3j to develop ethernet applications, so it mainly focuses on the development interface of web3j, while interspersing some basic concepts of ethernet, such as the development of accounts, transactions and intelligent contracts.

Thank you for your reading, the above is the content of "how to use the web3j class library for Android and Java Etaifang development zone block chain". After the study of this article, I believe you have a deeper understanding of how to use the web3j class library for Android and Java Etaifang development zone block chain, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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