如何使用扫描仪将对象添加到数组列表？

Question

我有一个数组列表，我的目标是不断将对象添加到数组列表中，直到用户输入一个值。我有两个不同的课程。我曾尝试使用扫描仪，但这只会更改变量的名称并且不会创建新对象。我是否必须从其他类继承。我将如何不断增加数组列表的大小？任何帮助表示赞赏。

下面是我的第一堂课：

public class Real_Entertainment 
{
    String BookName; 
    String Author; 
    double Rating; 
    int Purchases;

    public Real_Entertainment(String BookName, String Author, double Rating, int Purchases, int i)
    {
        this.BookName = BookName;
        this.Author = Author;
        this.Rating = Rating;
        this.Purchases = Purchases;
    }
    public void setBookName(String BookName)
    {
        this.BookName = BookName;
    }
    public void setAuthor (String Author )
    {
        this.Author = Author;
    }
    public void setRating (double Rating)
    {
        this.Rating = Rating;
    }
    public void setPurchased (int Purchases)
    {
        this.Purchases = Purchases;
    }

}

以下是我的主要课程：

import java.util.Scanner;
import java.util.ArrayList;

public class Real_Main 
{
    public static void main(String[] args) 
    {
        ArrayList<Real_Entertainment> print = new ArrayList<Real_Entertainment>();
        Real_Entertainment Book1 = new Real_Entertainment("The Nickel Boys ", "Colson 
        Whitehead", 4.3, 500,000);
        Real_Entertainment Book2 = new Real_Entertainment("Olive, Again", "Elizabeth Strout", 6, 
        321,000);
        Real_Entertainment Book3 = new Real_Entertainment("Gingerbread", "Helen Oyeyemi", 2, 
        681,000);
        Real_Entertainment Book4 = new Real_Entertainment ("On Earth We're Briefly Gorgeous", 
        "Ocean Vuong", 2, 421,000);

        print.add(Book1);
        print.add(Book2);
        print.add(Book3);
        print.add(Book4);
    }

    public void addToList(ArrayList<Real_Entertainment> print)
    { 

         //The method where it adds to the arraylist    
    }

}

Answer 1

从概念上讲，您想要做的是捕获用户的输入（例如，书名），然后使用该数据来实例化一个新的 Real_Entertainment 实例（如果这就是您所需要的），然后添加现有列表的新实例。例如：

Scanner scanner = new Scanner(System.in);
System.out.print("What is your book's title? ");
String title = scanner.next();
Real_Entertainment realEntertainment = new Real_Entertainment(title, null, 0, 0, 0);
print.add(realEntertainment);