用Java将对象存储在数组中

Question

这是一个简单的程序。 我被分配将对象存储在数组中。 但是由于我是初学者，所以我不知道如何将对象存储在数组中。 有人可以帮我解决这个问题吗？

    import java.util.Scanner;

    public class MainExample {

    public static void main(String[] args) {

    double length; 
    double width; 
    double price_per_sqyd;
    double price_for_padding; 
    double price_for_installation;
        String input; 
    double final_price; 
        boolean repeat = true;


    Scanner keyboard = new Scanner(System.in);

        while (repeat)
        {   


    System.out.println("\n" +"What is the length of the room?: ");
    length = keyboard.nextInt();

    System.out.println("What is the width of the room?: ");
    width = keyboard.nextInt();

    System.out.println("What is the price of the carpet per square yard?: ");
    price_per_sqyd = keyboard.nextDouble();

        System.out.println("What is the price for the padding?: ");
        price_for_padding = keyboard.nextDouble();

        System.out.println("What is the price of the installation?: ");
        price_for_installation = keyboard.nextDouble();


        keyboard.nextLine();

        System.out.println( "\n" + "Type 'yes' or 'no' if this is correct: ");
        input = keyboard.nextLine();

        if ("yes".equals(input)) 
         repeat = true; 
        else 
         repeat = false; 

        } 
    }
}

Answer 1

虽然不是很优雅，但是这个玩具程序的一个快速解决方案是创建一个具有各种属性的“房间”类，如“长度”、“宽度”、“price_per_sqft”等。然后你可以设置每个房间对象的特定属性和将“房间”对象存储在“房间”数组中。

Answer 2

你想在数组中存储什么？ 不同的final_price值？

无论如何，因为您不知道循环将运行多少次，所以您可能需要一个 ArrayList。 您可以通过添加ArrayList <Double> prices = new ArrayList <Double> ();

然后，在循环末尾添加一行，将正确的变量存储到 ArrayList。 例如： prices.add(final_price);

如果final_price不是您要存储的内容，则只需将其替换为您想要存储的变量即可。

另外，不要忘记，如果您确实使用了 ArrayList，您将需要在代码顶部使用正确的 import 语句： import java.util.ArrayList;

Answer 3

您需要创建一个类来保存这样的属性。 创建一个构造函数来初始化这些值。

public class Room{
     double length; 
   double width; 
    double price_per_sqyd;
    double price_for_padding; 
    double price_for_installation;
    String input; 
    double final_price; 
    boolean repeat = true;

}

然后在您的主方法/驱动程序类中创建一个具有此类类型的数组并存储相关对象。

Room arr=new Room[100];
 int count=0;
     while (repeat)
        {   


    System.out.println("\n" +"What is the length of the room?: ");
    length = keyboard.nextInt();

    System.out.println("What is the width of the room?: ");
    width = keyboard.nextInt();

    System.out.println("What is the price of the carpet per square yard?:      ");
    price_per_sqyd = keyboard.nextDouble();

        System.out.println("What is the price for the padding?: ");
        price_for_padding = keyboard.nextDouble();

    System.out.println("What is the price of the installation?: ");
    price_for_installation = keyboard.nextDouble();


        keyboard.nextLine();

        System.out.println( "\n" + "Type 'yes' or 'no' if this is correct: ");
    input = keyboard.nextLine();
arr[count]=new Room(length,width,price1,price2,price3,price4);//call to the constructor
    if ("yes".equals(input)) 
     repeat = true; 
count++;
    else 
     repeat = false; 

    } 
}