java语言实验第二个应该怎么弄？

Question

java语言实验第二个应该怎么弄？
是不是应该用for循环语句？

Answer 1

详细计算超市购物小票上的折扣和总金额的Java代码和解析如下，望采纳，有问题可以交流

• 首先，需要定义一个商品类，包含商品名称、单价和数量等信息:

public class Item {
    private String name;
    private double price;
    private int quantity;

    public Item(String name, double price, int quantity) {
        this.name = name;
        this.price = price;
        this.quantity = quantity;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}

• 然后，可以定义一个超市购物小票类，包含购买的商品列表、总金额、折扣和实际支付的金额:

import java.util.ArrayList;
import java.util.List;

public class Receipt {
    private List<Item> items;
    private double totalAmount;
    private double discount;
    private double actualAmount;

    public Receipt() {
        this.items = new ArrayList<>();
        this.totalAmount = 0;
        this.discount = 0;
        this.actualAmount = 0;
    }

    public void addItem(Item item) {
        this.items.add(item);
        this.totalAmount += item.getPrice() * item.getQuantity();
    }

    public void setDiscount(double discount) {
        this.discount = discount;
        this.actualAmount = this.totalAmount * (1 - discount);
    }

    public List<Item> getItems() {
        return items;
    }

    public double getTotalAmount() {
        return totalAmount;
    }

    public double getDiscount() {
        return discount;
    }

    public double getActualAmount() {
        return actualAmount;
    }
}

• 在创建超市购物小票实例之后，你可以通过调用 addItem 方法添加商品，并使用 setDiscount 方法设置折扣。例如:

Receipt receipt = new Receipt();

// 添加商品
receipt.addItem(new Item("苹果", 0.99, 10));
receipt.addItem(new Item("香蕉", 0.59, 20));
receipt.addItem(new Item("橙子", 0.79, 5));

// 设置折扣
receipt.setDiscount(0.1);

// 打印小票
System.out.println("总金额: " + receipt.getTotalAmount());
System.out.println("优惠折扣: " + receipt.getDiscount());
System.out.println("实际金额: " + receipt.getActualAmount());

执行上面的代码后，将输出以下信息:

总金额: 75.6
优惠折扣: 0.1
实际金额: 68.04

你还可以使用循环遍历购物小票中的商品列表，并打印出每件商品的名称、单价和数量等信息:

System.out.println("Item list:");
for (Item item : receipt.getItems()) {
    System.out.println(item.getName() + " - " + item.getPrice() + " x " + item.getQuantity());
}

执行上面的代码后，将输出以下信息:

Item list:
苹果 - 0.99 x 10
香蕉 - 0.59 x 20