具有不同数据类型(即字符串和整数)的数组. (Objectorientend) [英] Arrays with different datatypes i.e. strings and integers. (Objectorientend)

问题描述

例如，我有3本书: Booknumber (int)，Booktitle (string)，Booklanguage (string)，Bookprice (int).

For example I have 3 books: Booknumber (int), Booktitle (string), Booklanguage (string), Bookprice (int).

现在，我想拥有一个名为books[3][4]的数组.我正在获取通过setBooknumber设置的数据，如下所示:
Book1.getBooknumber(), Book1.getBooktitle(),...,Book3.getBookprice().

Now, I want to have an array called books[3][4]. I'm getting the data I set via setBooknumber like this:
Book1.getBooknumber(), Book1.getBooktitle(),...,Book3.getBookprice().

我怎么实现的:books[3][4] array.

我不能称其为String books[][] = new String [3][4].因为我无法进入Booknumber (int).我既不希望Booknumber也不是String也不希望Bookprice.请问我怎么知道的?

I can't call it String books[][] = new String [3][4]. Because I can't get Booknumber (int) into it. I don't want Booknumber to be String neither Bookprice. How do I realize it, please?

进一步详细说明.我有2个班级:book和bookUI.

To further elaborate it. I have 2 classes: book and bookUI.

书

public class book{
String Booktitle, Booklanguage;
int Booknumber, Bookprice;

//constructor

//get

//set
}

bookUI

public class bookUI
{
 public static void main(String arg[])
 {
   book book1 = new book();
   book book2 = new book();
   book book3 = new book();

   book1.setBooktitle();
   ...
   book3.setBookprice();

   //Here I want to have books[3][4] Array. And gettin the data via book1.get...book3.get into the array
 }
}

推荐答案

public class Book
{
    public int number;
    public String title;
    public String language;
    public int price;

    // Add constructor, get, set, as needed.
}

然后将您的数组声明为:

then declare your array as:

Book[] books = new Book[3];

为了响应O.P.的困惑，Book应该是一个对象，而不是数组.每本书应该自己创建(通过适当设计的构造函数)，然后添加到数组中.实际上，我不会使用数组，而是使用ArrayList.换句话说，您正在试图将数据强行放入不适合手头任务的容器中.

In response to O.P.'s confusion, Book should be an object, not an array. Each book should be created on it's own (via a properly designed constructor) and then added to the array. In fact, I wouldn't use an array, but an ArrayList. In other words, you are trying to force data into containers that aren't suitable for the task at hand.

我敢说，有50％的编程人员正在为您的数据选择正确的数据结构.如果有很好的结构选择，自然会遵循算法.

I would venture that 50% of programming is choosing the right data structure for your data. Algorithms naturally follow if there is a good choice of structure.

正确完成后，您的UI类将如下所示: 将泛型添加到以下代码段中.

When properly done, you get your UI class to look like: Generics added to the following code snippet.

...
ArrayList<Book> myLibrary = new ArrayList<Book>();
myLibrary.add(new Book(1, "Thinking In Java", "English", 4999));
myLibrary.add(new Book(2, "Hacking for Fun and Profit", "English", 1099);

等

现在您可以使用收藏夹"界面并执行类似的操作:

now you can use the Collections interface and do something like:

int total = 0;
for (Book b : myLibrary)
{
   total += b.price;
   System.out.println(b); // Assuming a valid toString in the Book class
}
System.out.println("The total value of your library is " + total);

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