Question

我坚持这个问题，我有一个名为book的类和另一个名为author

的类

在图书课上我有标题，作者，价格和ISBN

在作者班，我有名字，第二名和国籍

问题是将作者类与书类联系起来......

识别TestClass --------

public class BookTest {

    public static void main(String[] args) {    

        Author fullAuth = new Author("Bob", "Marly", "Russian");
        Book bookInf = new Book("Alice", fullAuth ,60000,2000);
        Student studInf = new Student("Ted", "21/10/1992", "Male","Simmonds Close 63","King Close 65","Computing", 12000);

        System.out.println(fullAuth.getAuNational() +" "+ fullAuth.getAuFname ());
        System.out.println(bookInf.getTitle() +" "+ bookInf.getPrice());
        System.out.println(studInf.getName() +" "+ studInf.getName ());
    }
}

Book Class ------------

public class Book{

    private double price;
    private int isbn;
    private String title;
    private String author;

    public Book (String title, String author, double price, int isbn){
        this.author = author;
        this.title = title;
        this.price = price;
        this.isbn = isbn;
    }

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

    public void setPriceBook(double price) {
        this.price = price;
    }
    public double getPrice() {
        return price;

    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public int getAuthor() {
        return isbn;
    }

    public void setIsbn(int isbn) {
        this.isbn = isbn;
    }
    public int getIsbn() {
        return isbn;
    }   
}

作者类----------

public class Author{

    private String auFname;
    private String auSname;
    private String auNational;

    public Author (String auFname, String auSname, String auNational){

        this.auFname = auFname;
        this.auFname = auSname;
        this.auNational = auNational;
    }

    public String getAuFname() {
        return auFname;
    }
    public void setFirstName(String auFname) {
        this.auFname = auFname;
    }

    public String getAuSname() {
        return auSname;
    }
    public void setSecondName(String auSname) {
        this.auSname = auSname;
    }

    public String getAuNational() {
        return auNational;
    }
    public void setAuNational(String auNational) {
        this.auNational = auNational;
    }   
}

Answer 1

类Book中的构造函数应如下所示：

public Book (String title, Author author, double price, int isbn){
    this.author = author;
    this.title = title;
    this.price = price;
    this.isbn = isbn;
}

还在主要做

Book bookInf = new Book("Alice", fullAuth ,60000,2000);

更改

public int getAuthor() {
    return isbn;
}

到

public Author getAuthor() {
    return author;
}

完整代码

BookTest.java

public class BookTest {

    public static void main(String[] args) {

        Author fullAuth = new Author("Bob", "Marly", "Russian");
        Book bookInf = new Book("Alice", fullAuth, 60000, 2000);
        //Student studInf = new Student("Ted", "21/10/1992", "Male", "Simmonds Close 63", "King Close 65", "Computing", 12000);

        System.out.println(fullAuth.getAuNational() + " " + fullAuth.getAuFname());
        System.out.println(bookInf.getTitle() + " " + bookInf.getPrice());
        //System.out.println(studInf.getName() + " " + studInf.getName());


    }
}

Book.java

public class Book {

    private double price;
    private int isbn;
    private String title;
    private Author author;

    public Book(Author a) {
        author = a;
    }

    public Book(String title, Author author, double price, int isbn) {
        this.author = author;
        this.title = title;
        this.price = price;
        this.isbn = isbn;
    }

    public void setTitleBook(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setPriceBook(double price) {
        this.price = price;
    }

    public double getPrice() {
        return price;
    }

    public void setAuthor(Author author) {
        this.author = author;
    }

    public Author getAuthor() {
        return author;
    }

    public void setIsbn(int isbn) {
        this.isbn = isbn;
    }

    public int getIsbn() {
        return isbn;
    }
}

Author.java

public class Author {

    private String auFname;
    private String auSname;
    private String auNational;

    public Author(String auFname, String auSname, String auNational) {
        this.auFname = auFname;
        this.auFname = auSname;
        this.auNational = auNational;
    }

    public String getAuFname() {
        return auFname;
    }

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

    public String getAuSname() {
        return auSname;
    }

    public void setSecondName(String auSname) {
        this.auSname = auSname;
    }

    public String getAuNational() {
        return auNational;
    }

    public void setAuNational(String auNational) {
        this.auNational = auNational;
    }
}

Answer 2

改变这个：

Book bookInf = new Book("Alice", author ,60000,2000);

到这个

Book bookInf = new Book("Alice", fullAuth ,60000,2000);

并改变这一点：

Author a = new Author(author, author, author);

到此：

this.author = author; //author being the parameter

Answer 3

您的意思是将Author类导入Book类吗？

那就是

import“package”.Author;

Answer 4

如果您询问如何从图书实例中检索作者信息，那么您可以使用

获取该信息

bookInf.getAuthor().getAuFname()

或

bookInf.getAuthor().getAuSname()

但是，您必须首先修改Book类的getAuthor方法，因为它返回的是isbn而不是author。希望它有所帮助。

连接两个类

4 个答案:

完整代码

BookTest.java

Book.java

Author.java