一个数组中有多个变量？

Question

我正在学习Java的入门课程,我正在建立一个小型图书馆系统,让图书管理员可以添加书籍,列出所有书籍并搜索特定书籍.

它现在正在运作,但在ArrayList一本书中只有标题.我想在图书馆中添加ISBN,作者,出版年份及其当前状态.如何在同一个中添加变量ArrayList？以下是我的ArrayList;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

//Array form available books

public final class ListBook {


    public static List<String> VALUES = new ArrayList<String>(Arrays.asList(
             new String[] {"Book1","Book2","Book3","Book4"} 
    ));
}

在这种情况下,另一个重要的类允许图书馆员添加一本新书;

public class InsertBook {

    // variables for the book info
    public String name_book;

    // Importing the list of books
    ListBook lb = new ListBook();
    // variable for the list of books
    private int x;

    // Constructors
    Scanner input_name = new Scanner(System.in);

    public void insertDataBook() {
        System.out.println("----------------------------------------");
        System.out.println("Write your book title:");

        name_book = input_name.next();
        System.out.println("----------------------------------------");
        System.out.println("The following value was added");
        System.out.println(name_book);
        System.out.println("----------------------------------------");

        lb.VALUES.add(name_book);

        // To iterate through each element, generate a for so the array comes to
        // a list. Through the variable x.
        for (x = 0; x < lb.VALUES.size(); x++) {
            System.out.println(lb.VALUES.get(x));
        }

    }

}

应该怎么做？

Answer 1

而不是只有一个ArrayList只有你的标题的"字符串",你将需要一个ArrayList对象.考虑以下:

class Book {
    public String ISBN;
    public String author;
    public String year;

    public Book(String ISBN, String author, String year) {
        this.ISBN = ISBN;
        this.author = author;
        this.year = year;
    }
}

然后您将添加到此列表,如下所示:

List<Book> VALUES = new ArrayList<Book>();
Book b = new Book("1234", "Name", "1984");
VALUES.add(b);