如何在Java中将系统更改号(SCN)转换为日期？

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

public class SCNToDateConverter {

    public static void main(String[] args) {
        String url = "jdbc:oracle:thin:@//localhost:1521/orcl"; // 替换为你的数据库URL
        String user = "username"; // 替换为你的用户名
        String password = "password"; // 替换为你的密码
        long scn = 123456789L; // 替换为你想要转换的SCN

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "{ ? = call DBMS_FLASHBACK.SCN_TO_TIMESTAMP(?) }";
            try (CallableStatement stmt = conn.prepareCall(sql)) {
                stmt.registerOutParameter(1, Types.TIMESTAMP);
                stmt.setLong(2, scn);
                stmt.execute();

                java.sql.Timestamp timestamp = stmt.getTimestamp(1);
                System.out.println("SCN " + scn + " 对应的日期时间是: " + timestamp);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}