Java 购物账单程序

2025 年 9 月 4 日 | 阅读 3 分钟

在本节中，我们将讨论如何创建Java 购物账单程序。要生成购物账单，我们需要产品 ID、名称、数量、单价和产品总价以及总计金额。除了产品详情，我们还可以添加其他信息，如购买日期、折扣（如果有）、SGST、CGST、POS 名称、地址、联系方式、账单号等。

在下面的 Java 程序中，我们创建了两个类：第一个是Product类，第二个是ShoppingBill类。

Product类包含与产品相关的详细信息，如产品名称、数量、单位价格和总价。我们将这些属性声明为私有，这样没有人可以直接访问这些属性。为了创建 Product 类的对象，我们创建了一个 Product 类的构造函数，并将所有产品属性放入该构造函数中。该类还包含一个名为 displayFormat() 的方法，该方法会在控制台上显示账单。

ShoppingBill类读取商品名称、数量、单位价格，并计算应付的总价。此外，在输入完产品详情后，还会读取一个字符“Y”或“N”。如果您想输入多个产品，请在输入每个产品的详细信息后按“Y”，否则按“N”。它会显示应付的总价。

在应用程序结束时，在显示结果之前，我们将显示所有产品的属性，为此，display() 方法用于进行一些格式打印。

ShoppingBill.java

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.Calendar;
class Product 
    {
        // properties
        private String id;
        private String pname;
        private int qty;
        private double price;
        private double totalPrice;
         
        // constructor
        Product(String id, String pname, int qty, double price, double totalPrice) 
        {
            this.id=id;
            this.pname = pname;
            this.qty = qty;
            this.price = price;
            this.totalPrice = totalPrice;
        }
            // getter methods
            public String getId() 
                {
                    return id;
                }
                public String getPname() 
                {
                    return pname;
                }
                public int getQty() 
                {
                    return qty;
                }
                public double getPrice() 
                {
                    return price;
                }
                public double getTotalPrice() 
                {
                    return totalPrice;
                }
                //displayFormat
                public static void displayFormat() 
                {
                	System.out.format("-----------------------------------------------------------------------------------------------------------------------------------");
                    System.out.print("\nProduct ID \t\tName\t\tQuantity\t\tRate \t\t\t\tTotal Price\n");
                    System.out.format("-----------------------------------------------------------------------------------------------------------------------------------\n");
                }
                 
                // display
                public void display() 
                {
                    System.out.format("   %-9s             %-9s      %5d               %9.2f                       %14.2f\n" ,id, pname, qty, price, totalPrice);
                }
    }
public class ShoppingBill 
    {
        public static void main(String args[]) 
            {
                // variables
                String id = null;
                String productName = null;
                int quantity = 0;
                double price = 0.0;
                double totalPrice = 0.0;
                double overAllPrice = 0.0;
                double cgst, sgst, subtotal=0.0, discount=0.0;
                char choice = '\0';
                System.out.println("\t\t\t\t--------------------Invoice-----------------");
                System.out.println("\t\t\t\t\t "+"  "+"Metro Mart Grocery Shop");
                System.out.println("\t\t\t\t\t3/98 Mecrobertganj New Mumbai");
                System.out.println("\t\t\t\t\t"  +"    " +"Opposite Metro Walk");
                System.out.println("GSTIN: 03AWBPP8756K592"+"\t\t\t\t\t\t\tContact: (+91) 9988776655");
                //format of date and time
                SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");  
                Date date = new Date();  
                Calendar calendar = Calendar.getInstance();
                String[] days = new String[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
                //prints current date and time
                System.out.println("Date: "+formatter.format(date)+"  "+days[calendar.get(Calendar.DAY_OF_WEEK) - 1]+"\t\t\t\t\t\t (+91) 9998887770");
                Scanner scan = new Scanner(System.in);
                System.out.print("Enter Customer Name: ");
                String customername=scan.nextLine();
                //create Scanner class object
                //creating an ArrayList to store the product
                List<Product> product = new ArrayList<Product>();
                do 
                    {
                        // read input values
                        System.out.println("Enter the product details: ");
                        System.out.print("Product ID: ");
                        id = scan.nextLine();
                        System.out.print("Product Name: ");
                        productName = scan.nextLine();
                        System.out.print("Quantity: ");
                        quantity = scan.nextInt();
                        System.out.print("Price (per unit): ");
                        price = scan.nextDouble();
                        //calculate total price for a particular product
                        totalPrice = price * quantity;
                        //calculates overall price
                        overAllPrice = overAllPrice + totalPrice;
                        //creates Product class object and add it to the List
                        product.add( new Product(id, productName, quantity, price, totalPrice) );
                        // ask for continue shopping?
                        System.out.print("Want to add more items? (y or n): ");
                        //reads a character Y or N
                        choice = scan.next().charAt(0);
                        //read remaining characters, don't store (no use)
                        scan.nextLine();
                    } 
                while (choice == 'y' || choice == 'Y');
                //display all product with its properties
                Product.displayFormat();
                for (Product p : product) 
                {
                    p.display();
                }
                //price calculation
                System.out.println("\n\t\t\t\t\t\t\t\t\t\tTotal Amount (Rs.) " +overAllPrice);
                //calculating discount
                discount = overAllPrice*2/100;
                System.out.println("\n\t\t\t\t\t\t\t\t\t\t    Discount (Rs.) " +discount);
                //total amount after discount
                subtotal = overAllPrice-discount; 
                System.out.println("\n\t\t\t\t\t\t\t\t\t\t          Subtotal "+subtotal);
                //calculating tax
                sgst=overAllPrice*12/100;
                System.out.println("\n\t\t\t\t\t\t\t\t\t\t          SGST (%) "+sgst);
                cgst=overAllPrice*12/100;
                System.out.println("\n\t\t\t\t\t\t\t\t\t\t          CGST (%) "+cgst);
                //calculating amount to be paid by buyer
                System.out.println("\n\t\t\t\t\t\t\t\t\t\t     Invoice Total " +(subtotal+cgst+sgst));
                System.out.println("\t\t\t\t----------------Thank You for Shopping!!-----------------");
                System.out.println("\t\t\t\t                     Visit Again");
                // close Scanner
                scan.close();
            }   
    }

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