在src_user原始碼目錄下建立 com.yihaomen.mybatis.inter 這個包

目前最大的限制是屬性必須是可變的（譯者注：即可寫的），物件初始化器才能工作：它們首先呼叫物件的建構函式(本例中是預設的無引數建構函式)，然後賦值給屬性 setter。

僅初始化(init-only)屬性解決了這個問題！它引入了一個 init 訪問器，它是 set 訪問器的變體，只能在物件初始化時呼叫：

public class Person
{
public string FirstName { get; init; }
public string LastName { get; init; }
}
有了這個宣告，上面的客戶端程式碼仍然是合法的，但是隨後對 FirstName 和 LastName 屬性的任何賦值都是錯誤的。

初始化(init) 訪問器和只讀(readonly)欄位
因為 init 訪問器只能在初始化期間呼叫，所以允許它們更改封閉類的只讀(readonly)欄位，就像在建構函式中一樣。

public class Person
{
private readonly string firstName;
private readonly string lastName;

public string FirstName
{
get => firstName;
init => firstName = (value ?? throw new ArgumentNullException(nameof(FirstName)));
}
public string LastName
{
get => lastName;
init => lastName = (value ?? throw new ArgumentNullException(nameof(LastName)));
}
}
二、記錄（record）
譯者注：
原文中宣告一個記錄的 data class ** 聯合關鍵字現在已經變成 record 關鍵字了，所以翻譯過程中做了修正。

如果您想使單個屬性不可變，那麼僅初始化(init-only)屬性是極好的。如果您想要整個物件是不可變的，行為像一個值，那麼你應該考慮宣告它為一個記錄(record)

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