我需要为类的初学者教程执行以下任务。
1) Create a class called User.
a) Add fields for name, age, and location.
b) Add a method called toString.
2) In the book class:
a) Change the author field to be of type User.
b) Modify the toString method to include the author's name.
以下是我的代码
public class User {
public String name;
public int age;
public String location;
public String author;
public String toString() {
String description1 = "Name:" + name + " Age:"+ age + " Location:" + location + " Reading:" + author;
return description1;
}
}
public class Book {
public String title;
public String author;
public int numPages;
public int isbn;
public Book(String title, String author, int numPages, int isbn){
this.title = title;
this.author = author;
this.numPages = numPages;
this.isbn = isbn;
}
public String toString() {
String description = "Title:" + title + "Author"+ author + "Num. of pages" + numPages + "ISBN" + isbn;
return description;
}
}
我不确定如何将作者字段更改为User类型。看看其他教程,我似乎无法找到对我来说非常基本的东西的答案:/
有什么建议吗?
答案 0 :(得分:0)
而不是
public String author;
你会用
public User author;
所以你的构造函数改为
public Book(String title, User author, int numPages, int isbn){
this.title = title;
this.author = author;
this.numPages = numPages;
this.isbn = isbn;
}
而不是
public String toString() {
String description = "Title:" + title + "Author"+ author + "Num. of pages" + numPages + "ISBN" + isbn;
return description;
}
你会用
public String toString() {
String description = "Title:" + title + "Author"+ author.name + "Num. of pages" + numPages + "ISBN" + isbn;
return description;
}
答案 1 :(得分:0)
Book
中的将public String author;
更改为private User author;
,新的toString()
也会如下所示:
public String toString() {
String description = "Title:" + title + "Author"+ author.getName() + "Num. of pages" + numPages + "ISBN" + isbn;
return description;
}
和构造函数也应该改为:
public Book(String title, User author, int numPages, int isbn){