Question

我是java编程以及整个对象编程的新手，我已经厌倦了使用哪种类型的数组。

我需要创建一个接受NAME和PRICE用户输入的数组，并将其存储在数组中。我尝试制作两个独立的阵列并使用计数器，但它不适合我的需要。问题在于我需要能够单独平均PRICE以及反转数组并在输入特定名称时过滤数组的问题。我也试过创建一个对象数组，我不确定这是否合适。

这是我的代码：

String names[] = new String[100]; // sets array size to almost ulimited #
            double prices[] = new double[100]; // sets array size to almost unlimited #
            double average = 0; // initializes the array 
            int count = 0; // initializes the count for the arraysize
            boolean flag = false;// initializes flag to false so it can be changed later


            while(true){
           System.out.print("Enter item " + (count + 1) + " name: "); // enter name
           names[count] = in.next(); // next string becomes count index
           if(names[count].equals("-1")){ break;} // if the next name entered is sentinel break
           System.out.print("Enter item " + (count + 1) + " price: "); // enter price
           prices[count] = in.nextDouble(); // stores price entered as array index
            // if next price == -1 then the program ends
           if(names[count].equalsIgnoreCase("peas")) flag = true;
           average += prices[count];
           count++;

       }
            System.out.println("The items and their prices are: ");
            for(int i = 0; i < count; i++){
           System.out.println(names[i] + ": " + formatter.format(prices[i]));
       }
            average /= count;
            if(flag == true){
           System.out.println("Average: " + formatter.format(average));
       }
            else{
                System.out.println("no average output");
       }

我不一定在寻找某人为我或类似的事情做这件事，我只是难过而且正在寻找我的逻辑应该考虑的方式。提前谢谢大家！

Answer 1

首先，您最好创建一个具有Price和public class Product { String name, price; //Getter and Setter // You can also define some other methods here as well. }字段的类。

ArrayList

现在创建该类的ArrayList<Product> myProduct = new ArrayList();。

{{1}}

并对此arraylist进行所有处理。

Answer 2

我认为你的循环基本上是好的，只是为了让它起作用我做了一些事情。 - 在一个循环中输出所有内容 - 如果平均值为真，则排除＆＃34;＆＃34;平均值是正确的只是某种程度上被认为是假的

    String names[] = new String[5]; // sets array size to almost unlimited #
            double prices[] = new double[100]; // sets array size to almost unlimited #
            double average = 0; // initializes the array 
            int count = 0; // initializes the count for the arraysize
            boolean flag = false;// initializes flag to false so it can be changed later


            while(true){
           System.out.print("Enter item " + (count + 1) + " name: "); // enter name
           names[count] = System.console().readLine();//in.next(); // next string becomes count index
           if(names[count].equals("-1")){ break;} // if the next name entered is sentinel break
           System.out.print("Enter item " + (count + 1) + " price: "); // enter price
           prices[count] = Double.valueOf(System.console().readLine());//in.nextDouble(); // stores price entered as array index
            // if next price == -1 then the program ends
           if(names[count].equalsIgnoreCase("peas")) flag = true;
           average += prices[count];
           count++;
//     }//deleted

            System.out.println("The items and their prices are: ");
            for(int i = 0; i < count; i++){
           System.out.println(names[i] + ": " + prices[i]);//formatter.format()
//     }//deleted
            average /= count;
            //if(flag == true){
           System.out.println("Average: " + average);//formatter.format()
       //}
            else{
                System.out.println("no average output");
       }//added
       }//added
       }

决定使用哪种类型的数组

2 个答案: