我可以在Java中替换单个变量的值吗？

Question

我有一个程序，用户在产品菜单中选择他们的产品，在他们输入项目ID和数量后，程序将询问他们是否要购买另一个，如果是，则交易再次重复并提出相同的问题。我的核心问题是我可以替换单个变量中的值吗？    Scanner id = new Scanner (System.in);    String products [] = {"Donut", "Ice Cream", "Kitkat", "Marshmallow", "Nutella"};    int prices [] = {25, 15, 40, 60, 150};    int number [] = {0, 1, 2 ,3 , 4};    char result [] = {'a', 'b', 'c','d'};    System.out.println("                Menu                ");     System.out.println("Item ID\tItem Name\tPrice (Php)");    System.out.println(number [0]+"\t"+products [0]+"\t\t"+prices[0]);      System.out.println(number [1]+"\t"+products [1]+"\t"+prices[1]);    System.out.println(number [2]+"\t"+products [2]+"\t\t"+prices[2]);    System.out.println(number [3]+"\t"+products [3]+"\t"+prices[3]);    System.out.println(number [4]+"\t"+products [4]+"\t\t"+prices[4]);    System.out.println();    System.out.print("Select ID Number: ");  int ID = id.nextInt();    System.out.println("Input quantity: ");  int QUANTITY = id.nextInt();  System.out.println("Product ID: "+ID);  int a = ID;  System.out.println("Product Name: "+products[ID]);  String b = products[ID];  System.out.println("Quantity: "+QUANTITY);  int c = QUANTITY;  System.out.println("Product Price: "+prices[ID]);  int d = prices[ID];  System.out.println("Amount to be Paid: "+(QUANTITY * prices[ID]));  int e = QUANTITY * prices[ID];  System.out.println("Added to cart, want to buy another? [Y] [N]");    char keys = id.next().charAt(0);    switch (keys) {    case 'Y':        method6();        break;     }输出必须是产品ID，名称，数量和数量必须以共享单个变量的不同值显示。

Answer 1

你可以使用 你可以使用 不清楚你不能做什么。List<String>String s =id+" | " + name + " | " + quantity + " | " + amount

但是，如果需要，您可以创建对象，并将其命名为...菜单。

public class Menu {

    private int productId;

    private int quantity;

    private int price; 

    private int totalPrice;

    private String productName;

    public Menu(){}

    public Menu(int productId,int quantity,int price,int totalPrice,String productName){

        this.productId=productId;

        this.quantity=quantity;

        this.price=price;

        this.totalPrice=totalPrice;

        this.productName=productName;

    }

    //setters and getters

    public void setProductId(int productId) {

        this.productId = productId;

    }

    

    public int getProductId() {

        return productId;

    }

    

    public void setProductName(int productName) {

        this.productName= productName;

    }

    

    public int getProductName() {

        return productName;

    }

    public int getQuantity() {

        return quantity;

    }

    

    public void setQuantity(int quantity) {

        this.quantity = quantity;

    }

    

    public int getPrice() {

        return price;

    }

    

    public void setPrice(double price) {

        this.price = price;

    }

    

    public int getTotalPrice() {

        return totalPrice;

    }

    

    public void setTotalPrice(double totalPrice) {

        this.totalPrice = totalPrice;

    }

}

在你当前的课程中，你可以做一些类似的东西

Menu menu=new Menu();

System.out.print("Select ID Number: ");

menu.setProductId(id.nextInt());

 System.out.println("Input quantity: ");

menu.setQuantity(id.nextInt());

 System.out.println("Quantity: "+menu.getQuantity());

menu.setProductName(products[menu.getProductId()])

System.out.println("Product Name: "+menu.getProductName());

menu.setPrice(prices[menu.getProduct(id)]);

menu.setTotalPrice(menu.getPrice()*menu.getQuantity());

System.out.println("Amount to be Paid: "+menu.getTotatPrice());