如何使用oracle jdeveloper和java连接数据库？

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class OracleDatabaseConnection {
    public static void main(String[] args) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;

        try {
            // 加载Oracle数据库驱动程序
            Class.forName("oracle.jdbc.driver.OracleDriver");

            // 建立数据库连接
            String url = "jdbc:oracle:thin:@localhost:1521:XE"; // 根据实际情况修改数据库URL
            String username = "your_username"; // 根据实际情况修改用户名
            String password = "your_password"; // 根据实际情况修改密码
            connection = DriverManager.getConnection(url, username, password);

            // 执行SQL查询
            String sql = "SELECT * FROM employees"; // 根据实际情况修改SQL查询语句
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();

            // 处理查询结果
            while (resultSet.next()) {
                String employeeName = resultSet.getString("name");
                int employeeId = resultSet.getInt("id");
                System.out.println("Employee ID: " + employeeId + ", Name: " + employeeName);
            }
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭数据库资源
            try {
                if (resultSet != null) {
                    resultSet.close();
                }
                if (preparedStatement != null) {
                    preparedStatement.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}