其思想是在.build()时间填充summary。

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.SuperBuilder;

@Data
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class Book
{
    protected String title;
    protected String author;
    protected String description;
}

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;
import lombok.ToString;
import lombok.experimental.SuperBuilder;

@Data
@EqualsAndHashCode(callSuper = true)
@ToString(callSuper = true)
@AllArgsConstructor
@NoArgsConstructor
@SuperBuilder
public class BookSummary extends Book
{
    public String summary;

    public BookSummary(BookSummaryBuilder<?, ?> b)
    {
       super(b);
       this.summary = getTitle() + getAuthor() + getDescription();
    }  
}

一切正常，但我想知道是否有一种更简单/更优雅的方法来完成同样的工作，而无需创建此构造函数

• • 更新**

我不能简单地覆盖summary get方法，因为一些将此对象作为参数接收的API不使用访问器从字段中检索值。
例如：

public class BookSummary extends Book
{
    @Builder.Default
    public String summary = "xxxxxxxxxxxxxxx";

    public String getSummary()
    {
        return getTitle() + getAuthor() + getDescription();
    }
}

BookSummary bookSummary = BookSummary.builder()
            .title("Java forever")
            .author("John John")
            .description("bla-bla-bla-bla")
            .build();

String json = new GsonBuilder().create().toJson(bookSummary)

Json：

{
    "summary":"xxxxxxxxxxxxxxx",
    "title":"Java forever",
    "author":"John John",
    "description":"bla-bla-bla-bla"
}