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sudo apt update
sudo apt install default-jdk

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sudo apt install gradle

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gradle -v

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sudo nano /etc/profile.d/gradle.sh

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export PATH=$PATH:/opt/gradle/gradle-<version>/bin

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sudo chmod +x /etc/profile.d/gradle.sh
source /etc/profile.d/gradle.sh

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ÔÚ¡°New Project¡±¶Ô»°¿òÖУ¬Ñ¡Ôñ¡°Gradle¡±×÷ΪÏîÄ¿ÀàÐÍ£¬²¢µã»÷¡°Next¡±°´Å¥¡£½ÓÏÂÀ´£¬Ñ¡ÔñÄúÏ£Íû½¨ÉèÏîÄ¿µÄĿ¼£¬²¢ÊäÈëÏîÄ¿µÄÃû³Æ¡£µã»÷¡°Finish¡±°´Å¥À´½¨ÉèÏîÄ¿¡£

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repositories {
    mavenCentral()
}

dependencies {
    implementation group: 'org.web3j', name: 'core', version: '4.8.3'
    implementation group: 'org.ethereum', name: 'ethereumj-core', version: '1.9.0-RELEASE'
}

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import org.web3j.crypto.Credentials;
import org.web3j.crypto.ECKeyPair;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.http.HttpService;
import org.web3j.protocol.core.methods.response.EthBlockNumber;

public class BlockchainExample {
    public static void main(String[] args) {
        // ÅþÁ¬µ½ÒÔÌ«·»½Úµã
        Web3j web3j = Web3j.build(new HttpService("https://ropsten.infura.io/v3/your-infura-project-id"));

        // ½¨ÉèÒ»¸öеÄÃÜÔ¿¶ÔºÍƾ֤
        ECKeyPair keyPair = ECKeyPair.create("your-private-key");
        Credentials credentials = Credentials.create(keyPair);

        // »ñÈ¡×îеÄÇø¿éºÅ
        EthBlockNumber blockNumber;
        try {
            blockNumber = web3j.ethBlockNumber().send();
            System.out.println("Latest block number: " + blockNumber.getBlockNumber());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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