Java |找不到符号 |返回一个对象

Question

我在返回我创建的对象书时遇到问题，我们将不胜感激任何帮助。该程序正在询问一本书，然后是一位作者，并将其存储在一个对象（书）中。然后将其保存到书籍数组中。

**import java.util.*;
public class BookShop {
    public static void main(String[] args) {
        Scanner kybd = new Scanner(System.in);
        book[] books = new book[10];

        for (int i = 0; i < books.length; i++){
            books[i] = getBook(kybd);
        }

        printBookDetails(books);
    }

    private static book getBook(Scanner kybd) {
        System.out.print("What Is The Title Of The Next Book?:>   ");
        String title = kybd.nextLine();

        System.out.print("Who Is The Author Of The Next Book?:>   ");
        String author = kybd.nextLine();

        if(author == null){
            book definedBook = new book();
            definedBook.setTitle(title);
        }
        else{
            book definedBook = new book();
            definedBook.setTitle(title);
            definedBook.setAuthor(author);
        }

        return definedBook;

    }

    private static void printBookDetails(book[] books) {

    }
}**

Answer 1

不要在 if/else 中定义 book 对象，只需在 if 之外定义它，例如：

book definedBook = new book();

 if (..) {
     //setter   
 } else {
  //setter
    ...
 }
 return definedBook;

Answer 2

移动 book 的声明，使其具有类似

的作用域

book definedBook = new book();
if (author == null){
    // book definedBook = new book();
    definedBook.setTitle(title);
} else{
    // book definedBook = new book();
    definedBook.setTitle(title);
    definedBook.setAuthor(author);
}

Java |找不到符号 |返回一个对象

Java | Cannot Find Symbol | Returning An Object

java

object

return

symbols