针对sakila数据库中的actor表(演员表)，每个列的意义是: actor_id:主键，用于唯一标识表中的每个演员 first_name:演员的名字 last_name:演员的姓氏 last_update:该行已创建或最近更新的时间 创建窗口，Java针对该表的数据提供增删改查操作，要求操作习惯和细节与课堂练习中的city窗口保持一致。

好的，针对sakila数据库中的actor表，以下是Java实现增删改查操作的示例：

1. 查询所有演员的信息

String query = "SELECT * FROM actor";
try {
    Connection conn = DriverManager.getConnection(url, username, password);
    Statement stmt = conn.createStatement();
    ResultSet rs = stmt.executeQuery(query);
    while(rs.next()){
        int actorId = rs.getInt("actor_id");
        String firstName = rs.getString("first_name");
        String lastName = rs.getString("last_name");
        Timestamp lastUpdate = rs.getTimestamp("last_update");
        // 处理查询结果
    }
    rs.close();
    stmt.close();
    conn.close();
} catch (SQLException e) {
    e.printStackTrace();
}

2. 查询某个演员的信息

String query = "SELECT * FROM actor WHERE actor_id = ?";
try {
    Connection conn = DriverManager.getConnection(url, username, password);
    PreparedStatement pstmt = conn.prepareStatement(query);
    pstmt.setInt(1, actorId);
    ResultSet rs = pstmt.executeQuery();
    if(rs.next()){
        int actorId = rs.getInt("actor_id");
        String firstName = rs.getString("first_name");
        String lastName = rs.getString("last_name");
        Timestamp lastUpdate = rs.getTimestamp("last_update");
        // 处理查询结果
    }
    rs.close();
    pstmt.close();
    conn.close();
} catch (SQLException e) {
    e.printStackTrace();
}

3. 添加一个新演员

String query = "INSERT INTO actor (first_name, last_name, last_update) VALUES (?, ?, NOW())";
try {
    Connection conn = DriverManager.getConnection(url, username, password);
    PreparedStatement pstmt = conn.prepareStatement(query);
    pstmt.setString(1, firstName);
    pstmt.setString(2, lastName);
    int rowsInserted = pstmt.executeUpdate();
    if(rowsInserted > 0){
        // 处理插入成功的情况
    }
    pstmt.close();
    conn.close();
} catch (SQLException e) {
    e.printStackTrace();
}

4. 更新某个演员的信息

String query = "UPDATE actor SET first_name = ?, last_name = ?, last_update = NOW() WHERE actor_id = ?";
try {
    Connection conn = DriverManager.getConnection(url, username, password);
    PreparedStatement pstmt = conn.prepareStatement(query);
    pstmt.setString(1, firstName);
    pstmt.setString(2, lastName);
    pstmt.setInt(3, actorId);
    int rowsUpdated = pstmt.executeUpdate();
    if(rowsUpdated > 0){
        // 处理更新成功的情况
    }
    pstmt.close();
    conn.close();
} catch (SQLException e) {
    e.printStackTrace();
}

5. 删除某个演员的信息

String query = "DELETE FROM actor WHERE actor_id = ?";
try {
    Connection conn = DriverManager.getConnection(url, username, password);
    PreparedStatement pstmt = conn.prepareStatement(query);
    pstmt.setInt(1, actorId);
    int rowsDeleted = pstmt.executeUpdate();
    if(rowsDeleted > 0){
        // 处理删除成功的情况
    }
    pstmt.close();
    conn.close();
} catch (SQLException e) {
    e.printStackTrace();
}

需要注意的是，在实际开发中，需要先加载数据库驱动，例如：

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

另外，为了防止SQL注入，建议使用PreparedStatement代替Statement，并将输入参数进行验证和转义。