java - 在条件构造函数上使用 @RequiredArgsConstructor

Question

我正在使用 Lombok 移动整个项目中所有硬编码的公共(public)/私有(private)构造函数。这是一个特殊的用例，其中有两个成员变量。但在构造函数中传递一个参数作为参数来设置属性。在这种情况下如何使用@RequiredArgsConstructor:

如何使用 @RequiredArgsConstructor 来转换此构造函数？

public ObjectToString(final String delimiter) {
        this.delimiter = delimiter;
        this.functions = new ArrayList<>();
    }

类模板:

public final class ObjectToString {

    private final String delimiter;
    private final List<String> functions;

    public ObjectToString(final String delimiter) {
        this.delimiter = delimiter;
        this.functions = new ArrayList<>();
    }

    public ObjectToString add(final List<String> func) {
        functions.add(func);
        return this;
    }
///Next lines follows the class implementation code.
}

Answer 1

尝试这样:

@RequiredArgsConstructor
public final class ObjectToString {

    private final String delimiter;
    private final List<String> functions = new ArrayList<>();

    public ObjectToString add(final List<String> func) {
        functions.add(func);
        return this;
    }

   // Rest excluded

}

在您的情况下，无需在构造函数中创建数组列表。如果您像这样初始化字段，lombok 将不会在构造函数中为其创建参数。

lombok 文档的相关部分:

@RequiredArgsConstructor generates a constructor with 1 parameter for each field that requires special handling. All non-initialized final fields get a parameter, as well as any fields that are marked as @NonNull that aren't initialized where they are declared. From: https://projectlombok.org/features/constructor