两个类创建相同的实例？？ java

Question

所以我在大学里参加了这个考试，就是要创作一本书 class，里面会有作者、书名、内容和译者。

主要要求是仅创建 1 个 class 并在其中创建内部 classes（作者和译者）

和一个 Main class 来测试它。

问题是当我创建作者和译者对象并尝试更改他们的名字时，他们都会更改名字。

这是我的代码：

图书Class:

public class Book {
    private Author author;
    private Translator translator;
    private String title;
    private String text;

    public interface IPerson {
        public void setFirstName(String name);
        public String getFirstName();
        public void setLastName(String name);
        public String getLastName();
    }
    //Author
    public class Author implements IPerson{
        private String firstName;
        private String lastName;

        public Author(String f, String l){
            firstName = f;
            lastName = l;
            author = this;
        }

        public void setFirstName(String name){
            this.firstName = name;
        }

        public String getFirstName(){
            return this.firstName;
        }

        public void setLastName(String name){
            this.lastName = name;
        }

        public String getLastName(){
            return this.lastName;
        }

    }
    public Author getAuthor(){
        return this.author;
    }
    //Translator
    public class Translator extends Author{

        public Translator(String f, String l) {
            super(f, l);
            translator = this;
        }
    }
    public Translator getTranslator(){
        return this.translator;
    }
    public String getTranslatorFullName(){
        return this.getTranslator().getFirstName() + " " + this.getTranslator().getLastName();
    }
    public String getText() {
        return this.text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getTitle() {
        return this.title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
    public String getDisplayTitle(){
        return getTitle() + " Author: " + this.getAuthor().getFirstName() + " " + this.getAuthor().getLastName();
    }
}

主要Class:

public class Main {
public static void main(String[] args){
    Book mybook = new Book();
    mybook.setTitle("Fight Club");
    mybook.setText("First rule of Fight Club, you do not talk about Fight Club");
    Book.Author author = mybook.new Author("John","Doe");
    Book.Translator translator = mybook.new Translator("Alan","Rickman");
    System.out.println(mybook.getDisplayTitle());
    System.out.println(mybook.getAuthor().getLastName());
    System.out.println(mybook.getAuthor().getFirstName());
    System.out.println(mybook.getTranslatorFullName());
    System.out.println(mybook.getTranslator().getFirstName());
}
}

它必须通过这些测试，我的问题是什么？

别告诉我让Translator实现IPerson，是我老师要求扩展的

Answer 1

您正在 Translator 的构造函数中进行 super(f,l) 调用。 Translator 正在更改 Author 字段，因为 Translator 的超类是 Author。

Answer 2

如果 Translator 实现 IPerson 而不是扩展 Author 会更有意义。

Answer 3

你可以这样修复：

public Author(String f, String l, boolean authorCheck){
    firstName = f;
    lastName = l;
    if(authorCheck)
    {
        author = this;
    }
}

public Author(String f, String l){
    firstName = f;
    lastName = l;
    author = this;
}

public Translator(String f, String l) {
    super(f, l, false);
    translator = this;
}

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