assignment date 20-03

Records/21CYS/CB.EN.U4CYS21018/assignment/12-06-cbenu4cys21018-gokul/Main.java

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+import java.io.FileOutputStream;
+import java.io.IOException;
+
+public class Main {
+
+  abstract static class FileTransfer {
+
+    void sendFile(String fileName) {
+      // Default implementation for sending a file
+      System.out.println("Sending file: " + fileName);
+    }
+
+    abstract void saveFile(byte[] fileData, String fileName);
+  }
+
+  public interface FileTransferListener {
+    void onFileSent(String fileName);
+    void onFileSaved(String fileName);
+  }
+
+  public static class FileTransferClient extends FileTransfer implements FileTransferListener {
+
+    void sendFile(String fileName) {
+      // Custom implementation for sending a file using socket programming
+      System.out.println("Sending file over the network: " + fileName);
+    }
+
+    public void onFileSaved(String fileName) {
+      System.out.println("File saved on the client side: " + fileName);
+    }
+
+    public void onFileSent(String fileName) {
+      System.out.println("File sent from the client side: " + fileName);
+    }
+
+    void saveFile(byte[] fileData, String fileName) {
+      // Not applicable for the client side
+    }
+  }
+
+  public static class FileTransferServer extends FileTransfer implements FileTransferListener {
+
+    @Override
+    void saveFile(byte[] fileData, String fileName) {
+      try {
+        FileOutputStream fileOutputStream = new FileOutputStream(fileName);
+        fileOutputStream.write(fileData);
+        fileOutputStream.close();
+      } catch (IOException e) {
+        System.out.println("Failed to save file: " + fileName);
+        return;
+      }
+
+      onFileSaved(fileName);
+    }
+
+    void sendFile(String fileName) {
+      // Not applicable for the server side
+    }
+
+    public void onFileSaved(String fileName) {
+      System.out.println("File saved on the server side: " + fileName);
+    }
+
+    public void onFileSent(String fileName) {
+      System.out.println("File sent from the server side: " + fileName);
+    }
+
+    void start() {
+      // Server initialization and listening for incoming file transfers
+      System.out.println("Server started. Listening for incoming file transfers.");
+    }
+  }
+
+  public static void main(String[] args) {
+    FileTransferClient client = new FileTransferClient();
+    FileTransferServer server = new FileTransferServer();
+
+    // Start the server to listen for incoming file transfers
+    server.start();
+
+    // Demonstrate sending a file from the client to the server
+    client.sendFile("file.txt");
+
+    // Demonstrate saving a file on the server
+    byte[] fileData = "This has been overwritten from here".getBytes();
+    server.saveFile(fileData, "file.txt");
+
+    // print the contents of the file from server side
+    System.out.println("File contents on the server side: " + new String(fileData));
+
+  }
+}

Records/21CYS/CB.EN.U4CYS21018/assignment/14-06-cbenu4cys21018-gokul/AddressBookApplication.java

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+import javax.swing.*;
+import javax.swing.table.DefaultTableModel;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.ArrayList;
+import java.util.List;
+
+public class AddressBookApplication extends JFrame {
+    private JTable contactTable;
+    private DefaultTableModel tableModel;
+    private JTextField nameField;
+    private JTextField phoneNumberField;
+    private JTextField emailField;
+    private JButton addButton;
+    private JButton editButton;
+    private JButton deleteButton;
+
+    private List<Contact> contacts;
+
+    public AddressBookApplication() {
+        contacts = new ArrayList<>();
+
+        setTitle("Address Book");
+        setSize(600, 400);
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+
+        createComponents();
+        addComponentsToFrame();
+    }
+
+    private void createComponents() {
+        // Table
+        tableModel = new DefaultTableModel();
+        tableModel.addColumn("Name");
+        tableModel.addColumn("Phone Number");
+        tableModel.addColumn("Email");
+        contactTable = new JTable(tableModel);
+
+        // Buttons
+        addButton = new JButton("Add");
+        editButton = new JButton("Edit");
+        deleteButton = new JButton("Delete");
+
+        // Form fields
+        nameField = new JTextField(20);
+        phoneNumberField = new JTextField(20);
+        emailField = new JTextField(20);
+
+        // Button listeners
+        addButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                addContact();
+            }
+        });
+
+        editButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                editContact();
+            }
+        });
+
+        deleteButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                deleteContact();
+            }
+        });
+    }
+
+    private void addComponentsToFrame() {
+        // Main layout
+        setLayout(new BorderLayout());
+
+        // Create a panel for the form fields
+        JPanel formPanel = new JPanel();
+        formPanel.setLayout(new GridLayout(3, 2));
+        formPanel.add(new JLabel("Name:"));
+        formPanel.add(nameField);
+        formPanel.add(new JLabel("Phone Number:"));
+        formPanel.add(phoneNumberField);
+        formPanel.add(new JLabel("Email:"));
+        formPanel.add(emailField);
+
+        // Create a panel for the buttons
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.add(addButton);
+        buttonPanel.add(editButton);
+        buttonPanel.add(deleteButton);
+
+        // Add the table, form, and button panels to the frame
+        add(new JScrollPane(contactTable), BorderLayout.CENTER);
+        add(formPanel, BorderLayout.NORTH);
+        add(buttonPanel, BorderLayout.SOUTH);
+    }
+
+    private void addContact() {
+        String name = nameField.getText();
+        String phoneNumber = phoneNumberField.getText();
+        String email = emailField.getText();
+
+        if (name.isEmpty()) {
+            showErrorDialog("Please enter a name.");
+            return;
+        }
+
+        if (!isValidPhoneNumber(phoneNumber)) {
+            showErrorDialog("Invalid phone number format.");
+            return;
+        }
+
+        if (!isValidEmail(email)) {
+            showErrorDialog("Invalid email format.");
+            return;
+        }
+
+        Contact contact = new Contact(name, phoneNumber, email);
+        contacts.add(contact);
+        tableModel.addRow(new Object[]{contact.getName(), contact.getPhoneNumber(), contact.getEmail()});
+        clearFormFields();
+    }
+
+    private void editContact() {
+        int selectedRow = contactTable.getSelectedRow();
+
+        if (selectedRow == -1) {
+            showErrorDialog("Please select a contact to edit.");
+            return;
+        }
+
+        Contact contact = contacts.get(selectedRow);
+        String name = nameField.getText();
+        String phoneNumber = phoneNumberField.getText();
+        String email = emailField.getText();
+
+        if (name.isEmpty()) {
+            showErrorDialog("Please enter a name.");
+            return;
+        }
+
+        if (!isValidPhoneNumber(phoneNumber)) {
+            showErrorDialog("Invalid phone number format.");
+            return;
+        }
+
+        if (!isValidEmail(email)) {
+            showErrorDialog("Invalid email format.");
+            return;
+        }
+
+        contact.setName(name);
+        contact.setPhoneNumber(phoneNumber);
+        contact.setEmail(email);
+        tableModel.setValueAt(name, selectedRow, 0);
+        tableModel.setValueAt(phoneNumber, selectedRow, 1);
+        tableModel.setValueAt(email, selectedRow, 2);
+        clearFormFields();
+    }
+
+    private void deleteContact() {
+        int selectedRow = contactTable.getSelectedRow();
+
+        if (selectedRow == -1) {
+            showErrorDialog("Please select a contact to delete.");
+            return;
+        }
+
+        contacts.remove(selectedRow);
+        tableModel.removeRow(selectedRow);
+        clearFormFields();
+    }
+
+    private void clearFormFields() {
+        nameField.setText("");
+        phoneNumberField.setText("");
+        emailField.setText("");
+    }
+
+    private void showErrorDialog(String message) {
+        JOptionPane.showMessageDialog(this, message, "Error", JOptionPane.ERROR_MESSAGE);
+    }
+
+    private boolean isValidPhoneNumber(String phoneNumber) {
+        // Add your phone number validation logic here
+        return true;
+    }
+
+    private boolean isValidEmail(String email) {
+        // Add your email validation logic here
+        return true;
+    }
+
+    private static class Contact {
+        private String name;
+        private String phoneNumber;
+        private String email;
+
+        public Contact(String name, String phoneNumber, String email) {
+            this.name = name;
+            this.phoneNumber = phoneNumber;
+            this.email = email;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public String getPhoneNumber() {
+            return phoneNumber;
+        }
+
+        public void setPhoneNumber(String phoneNumber) {
+            this.phoneNumber = phoneNumber;
+        }
+
+        public String getEmail() {
+            return email;
+        }
+
+        public void setEmail(String email) {
+            this.email = email;
+        }
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(new Runnable() {
+            public void run() {
+                new AddressBookApplication().setVisible(true);
+            }
+        });
+    }
+}