{"id":145654,"date":"2025-06-25T12:21:15","date_gmt":"2025-06-25T06:51:15","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145654"},"modified":"2025-06-25T12:21:15","modified_gmt":"2025-06-25T06:51:15","slug":"restaurant-billing-system-using-java","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/restaurant-billing-system-using-java\/","title":{"rendered":"Java Project &#8211; Restaurant Billing System"},"content":{"rendered":"<h3>SQL Queries<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">CREATE DATABASE restaurant_db;\r\nUSE restaurant_db;\r\n\r\nCREATE TABLE customers (\r\n    customer_id INT AUTO_INCREMENT PRIMARY KEY,\r\n    name VARCHAR(100),\r\n    contact VARCHAR(15)\r\n);\r\n\r\nCREATE TABLE menu_items (\r\n    item_id INT AUTO_INCREMENT PRIMARY KEY,\r\n    item_name VARCHAR(100),\r\n    price DECIMAL(10,2)\r\n);\r\n\r\nCREATE TABLE orders (\r\n    order_id INT AUTO_INCREMENT PRIMARY KEY,\r\n    customer_id INT,\r\n    order_date DATE,\r\n    FOREIGN KEY (customer_id) REFERENCES customers(customer_id)\r\n);\r\n\r\nCREATE TABLE order_items (\r\n    order_item_id INT AUTO_INCREMENT PRIMARY KEY,\r\n    order_id INT,\r\n    item_id INT,\r\n    quantity INT,\r\n    FOREIGN KEY (order_id) REFERENCES orders(order_id),\r\n    FOREIGN KEY (item_id) REFERENCES menu_items(item_id)\r\n);\r\n\r\nCREATE TABLE payments (\r\n    payment_id INT AUTO_INCREMENT PRIMARY KEY,\r\n    order_id INT,\r\n    payment_date DATE,\r\n    amount DECIMAL(10,2),\r\n    method VARCHAR(50),\r\n    FOREIGN KEY (order_id) REFERENCES orders(order_id)\r\n);<\/pre>\n<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">package db;\r\nimport java.sql.*;\r\n\r\npublic class DBConnection {\r\n    private static final String URL = \"jdbc:mysql:\/\/localhost:3306\/restaurant_db\";\r\n    private static final String USER = \"root\";\r\n    private static final String PASSWORD = \"\";\r\n\r\n    public static Connection getConnection() throws SQLException {\r\n        return DriverManager.getConnection(URL, USER, PASSWORD);\r\n    }\r\n}<\/pre>\n<h3>Program 2<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">package gui;\r\nimport db.DBConnection;\r\n\r\nimport javax.swing.*;\r\nimport java.awt.*;\r\nimport java.awt.event.*;\r\nimport java.sql.*;\r\nimport java.util.*;\r\n\r\npublic class BillingSystem extends JFrame {\r\n    private JComboBox&lt;String&gt; itemCombo;\r\n    private JTextField quantityField;\r\n    private JTextArea billArea;\r\n    private JButton addButton, payButton, deleteButton;\r\n    private Map&lt;String, Integer&gt; billMap = new HashMap&lt;&gt;();\r\n\r\n    public BillingSystem() {\r\n        setTitle(\"Restaurant Billing System\");\r\n        setLayout(new FlowLayout());\r\n        setSize(500, 500);\r\n        setDefaultCloseOperation(EXIT_ON_CLOSE);\r\n\r\n        itemCombo = new JComboBox&lt;&gt;();\r\n        loadItems();\r\n        quantityField = new JTextField(5);\r\n        billArea = new JTextArea(15, 40);\r\n        billArea.setEditable(false);\r\n        addButton = new JButton(\"Add\/Update Item\");\r\n        deleteButton = new JButton(\"Delete Item\");\r\n        payButton = new JButton(\"Make Payment\");\r\n\r\n        add(new JLabel(\"Item:\"));\r\n        add(itemCombo);\r\n        add(new JLabel(\"Qty:\"));\r\n        add(quantityField);\r\n        add(addButton);\r\n        add(deleteButton);\r\n        add(payButton);\r\n        add(new JScrollPane(billArea));\r\n\r\n        addButton.addActionListener(e -&gt; addOrUpdateItem());\r\n        deleteButton.addActionListener(e -&gt; deleteItem());\r\n        payButton.addActionListener(e -&gt; processPayment());\r\n\r\n        setVisible(true);\r\n    }\r\n\r\n    private void loadItems() {\r\n        try (Connection con = DBConnection.getConnection();\r\n             Statement stmt = con.createStatement();\r\n             ResultSet rs = stmt.executeQuery(\"SELECT item_name FROM menu_items\")) {\r\n            while (rs.next()) {\r\n                itemCombo.addItem(rs.getString(\"item_name\"));\r\n            }\r\n        } catch (Exception ex) {\r\n            JOptionPane.showMessageDialog(this, \"Error loading items: \" + ex.getMessage());\r\n        }\r\n    }\r\n\r\n    private void addOrUpdateItem() {\r\n        String item = (String) itemCombo.getSelectedItem();\r\n        int qty = Integer.parseInt(quantityField.getText());\r\n        billMap.put(item, billMap.getOrDefault(item, 0) + qty);\r\n        showBill();\r\n    }\r\n\r\n    private void deleteItem() {\r\n        String item = (String) itemCombo.getSelectedItem();\r\n        billMap.remove(item);\r\n        showBill();\r\n    }\r\n\r\n    private void showBill() {\r\n        billArea.setText(\"\");\r\n        double grandTotal = 0.0;\r\n\r\n        try (Connection con = DBConnection.getConnection();\r\n             PreparedStatement pst = con.prepareStatement(\"SELECT price FROM menu_items WHERE item_name = ?\")) {\r\n\r\n            for (String item : billMap.keySet()) {\r\n                int qty = billMap.get(item);\r\n                pst.setString(1, item);\r\n                ResultSet rs = pst.executeQuery();\r\n                if (rs.next()) {\r\n                    double price = rs.getDouble(\"price\");\r\n                    double total = qty * price;\r\n                    grandTotal += total;\r\n                    billArea.append(item + \" x \" + qty + \" = \u20b9\" + total + \"\\n\");\r\n                }\r\n            }\r\n            billArea.append(\"----------------------------\\n\");\r\n            billArea.append(\"Total: \u20b9\" + grandTotal + \"\\n\");\r\n        } catch (Exception ex) {\r\n            JOptionPane.showMessageDialog(this, \"Error displaying bill: \" + ex.getMessage());\r\n        }\r\n    }\r\n\r\n    private void processPayment() {\r\n        if (billMap.isEmpty()) {\r\n            JOptionPane.showMessageDialog(this, \"No items in bill to pay.\");\r\n            return;\r\n        }\r\n\r\n        String[] methods = {\"Cash\", \"Card\", \"UPI\"};\r\n        String method = (String) JOptionPane.showInputDialog(this, \"Select payment method:\", \"Payment\",\r\n                JOptionPane.QUESTION_MESSAGE, null, methods, methods[0]);\r\n\r\n        if (method == null) return;\r\n\r\n        try (Connection con = DBConnection.getConnection()) {\r\n            con.setAutoCommit(false);\r\n\r\n            \/\/ Insert dummy customer\r\n            PreparedStatement customerStmt = con.prepareStatement(\"INSERT INTO customers (name, contact) VALUES (?, ?)\", Statement.RETURN_GENERATED_KEYS);\r\n            customerStmt.setString(1, \"Walk-in\");\r\n            customerStmt.setString(2, \"N\/A\");\r\n            customerStmt.executeUpdate();\r\n            ResultSet custKeys = customerStmt.getGeneratedKeys();\r\n            custKeys.next();\r\n            int customerId = custKeys.getInt(1);\r\n\r\n            \/\/ Insert order\r\n            PreparedStatement orderStmt = con.prepareStatement(\"INSERT INTO orders (customer_id, order_date) VALUES (?, CURDATE())\", Statement.RETURN_GENERATED_KEYS);\r\n            orderStmt.setInt(1, customerId);\r\n            orderStmt.executeUpdate();\r\n            ResultSet orderKeys = orderStmt.getGeneratedKeys();\r\n            orderKeys.next();\r\n            int orderId = orderKeys.getInt(1);\r\n\r\n            \/\/ Insert order items\r\n            PreparedStatement itemStmt = con.prepareStatement(\"SELECT item_id, price FROM menu_items WHERE item_name = ?\");\r\n            PreparedStatement insertOrderItem = con.prepareStatement(\"INSERT INTO order_items (order_id, item_id, quantity) VALUES (?, ?, ?)\");\r\n            double totalAmount = 0.0;\r\n\r\n            for (String item : billMap.keySet()) {\r\n                int qty = billMap.get(item);\r\n                itemStmt.setString(1, item);\r\n                ResultSet rs = itemStmt.executeQuery();\r\n                if (rs.next()) {\r\n                    int itemId = rs.getInt(\"item_id\");\r\n                    double price = rs.getDouble(\"price\");\r\n                    totalAmount += qty * price;\r\n\r\n                    insertOrderItem.setInt(1, orderId);\r\n                    insertOrderItem.setInt(2, itemId);\r\n                    insertOrderItem.setInt(3, qty);\r\n                    insertOrderItem.executeUpdate();\r\n                }\r\n            }\r\n\r\n            \/\/ Insert payment\r\n            PreparedStatement payStmt = con.prepareStatement(\"INSERT INTO payments (order_id, payment_date, amount, method) VALUES (?, CURDATE(), ?, ?)\");\r\n            payStmt.setInt(1, orderId);\r\n            payStmt.setDouble(2, totalAmount);\r\n            payStmt.setString(3, method);\r\n            payStmt.executeUpdate();\r\n\r\n            con.commit();\r\n            JOptionPane.showMessageDialog(this, \"Payment Successful! Receipt Generated.\");\r\n            billMap.clear();\r\n            showBill();\r\n        } catch (Exception ex) {\r\n            JOptionPane.showMessageDialog(this, \"Error processing payment: \" + ex.getMessage());\r\n        }\r\n    }\r\n\r\n    public static void main(String[] args) {\r\n        SwingUtilities.invokeLater(BillingSystem::new);\r\n    }\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQL Queries CREATE DATABASE restaurant_db; USE restaurant_db; CREATE TABLE customers ( customer_id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(100), contact VARCHAR(15) ); CREATE TABLE menu_items ( item_id INT AUTO_INCREMENT PRIMARY KEY, item_name VARCHAR(100), price DECIMAL(10,2)&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[29859,29858,22479,34724,34722,7726,34374,34375,34723],"class_list":["post-145654","post","type-post","status-publish","format-standard","hentry","category-java","tag-java-practical","tag-java-program","tag-java-project","tag-java-restaurant-billing-system","tag-java-restaurant-billing-system-project","tag-java-tutorial","tag-restaurant-billing-system","tag-restaurant-billing-system-project","tag-restaurant-billing-system-using-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java Project - Restaurant Billing System - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/restaurant-billing-system-using-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java Project - Restaurant Billing System - DataFlair\" \/>\n<meta property=\"og:description\" content=\"SQL Queries CREATE DATABASE restaurant_db; 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