import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Random;

public class new_test {

public static void main(String[] args) {
ArrayList<String>objectsToStore = new ArrayList<>();

    Random rad = new Random();

    for (int j=1; j<=1; j++ )
    {
        objectsToStore.add("usename"+rad.nextInt()+"@gmail.com");

    }

    try {

        Class.forName("com.mysql.jdbc.Driver") ;

        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useSSL=false", "root", "");

        connection.setAutoCommit(false);
        Statement statement = connection.createStatement();

        for (String objectsToStore : objectsToStore  ) {

            statement.executeUpdate("INSERT INTO USER_DATA (email) VALUES ('" +objectsToStore +"')");
        }

        connection.commit();
        statement.close();
        connection.close();

    } catch (Exception e) {
        throw new RuntimeException(e);
    }

}

}