import org.web3j.abi.datatypes.Address; import org.web3j.protocol.Web3j; import org.web3j.protocol.core.methods.response.Web3ClientVersion; import org.web3j.protocol.http.HttpService; public class Web3jExample { public static void main(String[] args) { Web3j web3j = Web3j.build(new HttpService("https://mainnet.infura.io/v3/YOUR_INFURA_API_KEY")); try { Web3ClientVersion web3ClientVersion = web3j.web3ClientVersion().send(); String clientVersion = web3ClientVersion.getWeb3ClientVersion(); } catch (Exception e) { e.printStackTrace(); } } }